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• SqlBulkCopy is slow, doesn't utilize full network speed

  - by Alex

  Hi, for that past couple of weeks I have been creating generic script that is able to copy databases. The goal is to be able to specify any database on some server and copy it to some other location, and it should only copy the specified content. The exact content to be copied over is specified in a configuration file. This script is going to be used on some 10 different databases and run weekly. And in the end we are copying only about 3%-20% of databases which are as large as 500GB. I have been using the SMO assemblies to achieve this. This is my first time working with SMO and it took a while to create generic way to copy the schema objects, filegroups ...etc. (Actually helped find some bad stored procs). Overall I have a working script which is lacking on performance (and at times times out) and was hoping you guys would be able to help. When executing the WriteToServer command to copy large amount of data ( 6GB) it reaches my timeout period of 1hr. Here is the core code for copying table data. The script is written in PowerShell. $query = ("SELECT * FROM $selectedTable " + $global:selectiveTables.Get_Item($selectedTable)).Trim() Write-LogOutput "Copying $selectedTable : '$query'" $cmd = New-Object Data.SqlClient.SqlCommand -argumentList $query, $source $cmd.CommandTimeout = 120; $bulkData = ([Data.SqlClient.SqlBulkCopy]$destination) $bulkData.DestinationTableName = $selectedTable; $bulkData.BulkCopyTimeout = $global:tableCopyDataTimeout # = 3600 $reader = $cmd.ExecuteReader(); $bulkData.WriteToServer($reader); # Takes forever here on large tables The source and target databases are located on different servers so I kept track of the network speed as well. The network utilization never went over 1% which was quite surprising to me. But when I just transfer some large files between the servers, the network utilization spikes up to 10%. I have tried setting the $bulkData.BatchSize to 5000 but nothing really changed. Increasing the BulkCopyTimeout to an even greater amount would only solve the timeout. I really would like to know why the network is not being used fully. Anyone else had this problem? Any suggestions on networking or bulk copy will be appreciated. And please let me know if you need more information. Thanks. UPDATE I have tweaked several options that increase the performance of SqlBulkCopy, such as setting the transaction logging to simple and providing a table lock to SqlBulkCopy instead of the default row lock. Also some tables are better optimized for certain batch sizes. Overall, the duration of the copy was decreased by some 15%. And what we will do is execute the copy of each database simultaneously on different servers. But I am still having a timeout issue when copying one of the databases. When copying one of the larger databases, there is a table for which I consistently get the following exception: System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. It is thrown about 16 after it starts copying the table which is no where near my BulkCopyTimeout. Even though I get the exception that table is fully copied in the end. Also, if I truncate that table and restart my process for that table only, the tables is copied over without any issues. But going through the process of copying that entire database fails always for that one table. I have tried executing the entire process and reseting the connection before copying that faulty table, but it still errored out. My SqlBulkCopy and Reader are closed after each table. Any suggestions as to what else could be causing the script to fail at the point each time?

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• Error in loading component property (Swing GUI Forms)

  - by Christo Du Preez

  For no apparent reason all my Swing GUI forms using components linked to org.jdesktop.beansbinding.Converter started generating errors when trying to open the Design View: Error Error in loading component property: [JPanel]-filterTextField-converter. Cannot load property type class org.jdesktop.beansbinding.Converter. The property cannot be loaded. Errors occurred in loading... I'm currently using Netbeans 6.8. I opened my project in Netbeans 6.7.1 and all was fine but after a while the same thing happened. Looking at the .form and .java files and comparing it to previous backups, everything looks fine. Even my Netbeans tutorial project no longer works. What can cause this. Any suggestions would greatly be appreciated. After further investigation this is taken from my IDE's log : INFO: msg org.openide.ErrorManager$AnnException: msg at org.openide.ErrorManager$AnnException.findOrCreate(ErrorManager.java:867) at org.openide.ErrorManager$DelegatingErrorManager.annotate(ErrorManager.java:650) at org.netbeans.modules.form.GandalfPersistenceManager.annotateException(GandalfPersistenceManager.java:230) at org.netbeans.modules.form.GandalfPersistenceManager.annotateException(GandalfPersistenceManager.java:240) at org.netbeans.modules.form.GandalfPersistenceManager.getPropertyType(GandalfPersistenceManager.java:2362) at org.netbeans.modules.form.GandalfPersistenceManager.loadProperty(GandalfPersistenceManager.java:2041) at org.netbeans.modules.form.GandalfPersistenceManager.loadBindingProperties(GandalfPersistenceManager.java:2627) at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:900) at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:845) at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:979) at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:845) at org.netbeans.modules.form.GandalfPersistenceManager.loadNonVisuals(GandalfPersistenceManager.java:695) at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:529) at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:290) at org.netbeans.modules.form.FormEditor$3.run(FormEditor.java:339) at org.netbeans.modules.form.FormLAF$2.run(FormLAF.java:287) at org.openide.util.Mutex.doEventAccess(Mutex.java:1355) at org.openide.util.Mutex.readAccess(Mutex.java:317) at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:272) at org.netbeans.modules.form.FormEditor.loadFormData(FormEditor.java:337) at org.netbeans.modules.form.FormEditor.loadForm(FormEditor.java:266) at org.netbeans.modules.form.FormEditorSupport.loadForm(FormEditorSupport.java:306) at org.netbeans.modules.form.FormEditorSupport$3.run(FormEditorSupport.java:457) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) Caused by: java.lang.ClassNotFoundException: Will not load class org.jdesktop.beansbinding.Converter arbitrarily from one of ModuleCL@738d08[org.jdesktop.beansbinding] and ModuleCL@167e3a5[javax.beans.binding] starting from SystemClassLoader[556 modules]; see http://wiki.netbeans.org/DevFaqModuleCCE at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:241) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at org.netbeans.modules.form.project.FormClassLoader.findClass(FormClassLoader.java:83) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at org.netbeans.modules.form.project.ClassPathUtils.loadClass(ClassPathUtils.java:95) at org.netbeans.modules.form.FormUtils.loadClass(FormUtils.java:1445) at org.netbeans.modules.form.PersistenceObjectRegistry.loadClass(PersistenceObjectRegistry.java:95) at org.netbeans.modules.form.GandalfPersistenceManager.getClassFromString(GandalfPersistenceManager.java:5516) at org.netbeans.modules.form.GandalfPersistenceManager.getPropertyType(GandalfPersistenceManager.java:2348) ... 27 more msg Error in loading component property: Other Components-mainPanel-jTextField1-converter Cannot load property type class org.jdesktop.beansbinding.Converter. The property cannot be loaded. Can someone please help me with this issue. This is still not resolved and not being able to edit my Forms or loosing binding properties every time I need to edit a Form is a real pain and time consuming! Any help would greatly be appreciated. Thanx.

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• Sporadic EXC_BAD_INSTRUCTION (SIGILL) when in 64 bit mode

  - by Ger Teunis

  For some reason for a low-number of users (say 1 in a few hundred) the application seem to crash when run in 64bit mode on a Snow Leopard 10.6.3 I've attached the code, but please remind IT IS NOT A CODE issue. The crashed seem to be random in com.apple.AppKit at random locations and random moments. Anyone else had any experiences? Using GCC compiler of Xcode 3.2.2 Crash #1 of user Code Type: X86-64 (Native) Parent Process: launchd [90] Date/Time: 2010-05-02 04:12:59.708 -0500 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: objc[232]: alt handlers in objc runtime are buggy! Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x00007fff874dd8b7 _objc_fatal + 238 1 libobjc.A.dylib 0x00007fff874de57c objc_addExceptionHandler + 1026 2 com.apple.CoreFoundation 0x00007fff83914212 _CFDoExceptionOperation + 402 3 com.apple.AppKit 0x00007fff87afc55d _NSAppKitLock + 79 4 com.apple.AppKit 0x00007fff87bd1f93 +[NSColorList _findColorListNamed:forDeviceType:] + 86 5 com.apple.AppKit 0x00007fff87b9d304 -[NSCatalogColor colorUsingColorSpaceName:device:] + 255 6 com.apple.AppKit 0x00007fff87c985ad -[NSLayoutManager(NSPrivate) _drawGlyphsForGlyphRange:atPoint:parameters:] + 4764 7 com.apple.AppKit 0x00007fff87c5d79c -[NSTextView drawRect:] + 1839 8 com.apple.AppKit 0x00007fff87c5ce2e -[NSTextView _drawRect:clip:] + 2343 9 com.apple.AppKit 0x00007fff87be4485 -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1325 10 com.apple.AppKit 0x00007fff87be47ef -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2199 11 com.apple.AppKit 0x00007fff87be2b57 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 767 12 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 13 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 14 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 15 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 16 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 17 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 18 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 19 com.apple.AppKit 0x00007fff87be3a23 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555 20 com.apple.AppKit 0x00007fff87be2678 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 254 21 com.apple.AppKit 0x00007fff87bdef27 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2683 22 com.apple.AppKit 0x00007fff87b58777 -[NSView displayIfNeeded] + 969 23 com.apple.AppKit 0x00007fff87b53622 _handleWindowNeedsDisplay + 678 24 com.apple.Foundation 0x00007fff8600fa4d __NSFireTimer + 114 25 com.apple.CoreFoundation 0x00007fff83908708 __CFRunLoopRun + 6488 26 com.apple.CoreFoundation 0x00007fff839068df CFRunLoopRunSpecific + 575 27 com.apple.HIToolbox 0x00007fff821b5ada RunCurrentEventLoopInMode + 333 28 com.apple.HIToolbox 0x00007fff821b58df ReceiveNextEventCommon + 310 29 com.apple.HIToolbox 0x00007fff821b5798 BlockUntilNextEventMatchingListInMode + 59 30 com.apple.AppKit 0x00007fff87b28a2a _DPSNextEvent + 708 31 com.apple.AppKit 0x00007fff87b28379 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 32 com.apple.AppKit 0x00007fff87d37060 -[NSTextView mouseDown:] + 8426 33 com.apple.AppKit 0x00007fff87c21f1b -[NSWindow sendEvent:] + 5409 34 com.apple.AppKit 0x00007fff87b57662 -[NSApplication sendEvent:] + 4719 35 com.apple.AppKit 0x00007fff87aee0aa -[NSApplication run] + 474 36 com.apple.AppKit 0x00007fff87ae6d7c NSApplicationMain + 364 37 com.NZBVortex.NZBVortex 0x0000000100000fe0 start + 52 Crash #2 from same user moments later Code Type: X86-64 (Native) Parent Process: launchd [76] Date/Time: 2010-05-02 11:59:33.226 +0200 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: objc[4360]: alt handlers in objc runtime are buggy! Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x00007fff8015d8b7 _objc_fatal + 238 1 libobjc.A.dylib 0x00007fff8015e57c objc_addExceptionHandler + 1026 2 com.apple.CoreFoundation 0x00007fff85367212 _CFDoExceptionOperation + 402 3 com.apple.AppKit 0x00007fff840b5f2f -[NSViewHierarchyLock lockForReadingWithExceptionHandler:] + 478 4 com.apple.AppKit 0x00007fff8420753e -[NSConcreteTextStorage _lockForReading] + 243 5 com.apple.AppKit 0x00007fff841e1449 -[NSLayoutManager(NSPrivate) _fillGlyphHoleForCharacterRange:startGlyphIndex:desiredNumberOfCharacters:] + 320 6 com.apple.AppKit 0x00007fff840e204a _NSFastFillAllGlyphHolesForGlyphRange + 719 7 com.apple.AppKit 0x00007fff841e10e2 _NSFastFillAllLayoutHolesUpToEndOfContainerForGlyphIndex + 653 8 com.apple.AppKit 0x00007fff841e0c72 -[NSLayoutManager textContainerForGlyphAtIndex:effectiveRange:] + 243 9 com.apple.AppKit 0x00007fff840f6786 -[NSLayoutManager glyphRangeForTextContainer:] + 286 10 com.apple.AppKit 0x00007fff846664a9 -[NSToolTipStringDrawingLayoutManager _sizeWithSize:attributedString:] + 883 11 com.apple.AppKit 0x00007fff84665dad +[NSToolTipStringDrawingLayoutManager sizeForDisplayingAttributedString:] + 354 12 com.apple.AppKit 0x00007fff84667292 -[NSToolTipManager displayToolTip:] + 616 13 com.apple.AppKit 0x00007fff846657d4 toolTipTimerFired + 114 14 com.apple.CoreFoundation 0x00007fff8535b708 __CFRunLoopRun + 6488 15 com.apple.CoreFoundation 0x00007fff853598df CFRunLoopRunSpecific + 575 16 com.apple.HIToolbox 0x00007fff88510ada RunCurrentEventLoopInMode + 333 17 com.apple.HIToolbox 0x00007fff885108df ReceiveNextEventCommon + 310 18 com.apple.HIToolbox 0x00007fff88510798 BlockUntilNextEventMatchingListInMode + 59 19 com.apple.AppKit 0x00007fff840d1a2a _DPSNextEvent + 708 20 com.apple.AppKit 0x00007fff840d1379 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 21 com.apple.AppKit 0x00007fff8409705b -[NSApplication run] + 395 22 com.apple.AppKit 0x00007fff8408fd7c NSApplicationMain + 364 23 com.NZBVortex.NZBVortex 0x0000000100000fe0 start + 52 Weirdly enough the crashes seem to go away for these users when running the code in 32 bit mode. Any suggestions other then running the application in 32 bit only? Please do not dilute the feedback by asking for or blaming the code, the code is 100% solid, guaranteed! No memory leaks, the crashes clearly are triggered in 32 bit mode only just after start inside the AppKit itself like deep inside NSThread sleep's callstack.

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• Fonts, goes back to default size

  - by Bladimir Ruiz

  Every time I change the font, it goes back to the default size, which is 12, even if I change it before with the "Tamano" menu, it only goes back to 12 every time, my guess would be the way I change the size with deriveFont(), but don't I now any other way to change it. public static class cambiar extends JFrame { public cambiar() { final Font aryal = new Font("Comic Sans MS", Font.PLAIN, 12); JFrame ventana = new JFrame("Cambios en el Texto!"); JPanel adentro = new JPanel(); final JLabel texto = new JLabel("Texto a Cambiar!"); texto.setFont(aryal); JMenuBar menu = new JMenuBar(); JMenu fuentes = new JMenu("Fuentes"); /* Elementos de Fuentes */ JMenuItem arial = new JMenuItem("Arial"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Font arrrial = new Font("Arial", Font.PLAIN, 12); float tam = (float) texto.getFont().getSize(); String hola = String.valueOf(tam); texto.setFont(arrrial); texto.setFont(texto.getFont().deriveFont(tam)); } }); fuentes.add(arial); /* FIN Fuentes */ JMenu tamano = new JMenu("Tamano"); /* Elementos de Tamano */ JMenuItem font13 = new JMenuItem("13"); font13.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(texto.getFont().deriveFont(23.0f)); } }); JMenuItem font14 = new JMenuItem("14"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); JMenuItem font15 = new JMenuItem("15"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); JMenuItem font16 = new JMenuItem("16"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); JMenuItem font17 = new JMenuItem("17"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); JMenuItem font18 = new JMenuItem("18"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); JMenuItem font19 = new JMenuItem("19"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); JMenuItem font20 = new JMenuItem("20"); arial.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { texto.setFont(aryal); } }); tamano.add(font13); /* FIN tanano */ JMenu tipo = new JMenu("Tipo"); /* Elementos de tipo */ /* FIN tipo */ /* Elementos del JMENU */ menu.add(fuentes); menu.add(tamano); menu.add(tipo); /* FIN JMENU */ /* Elementos del JPanel */ adentro.add(menu); adentro.add(texto); /* FIN JPanel */ /* Elementos del JFRAME */ ventana.add(adentro); ventana.setVisible(true); ventana.setSize(250, 250); /* FIN JFRAME */ } } Thanks in Advance!

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• Should we hire someone who writes C in Perl?

  - by paxdiablo

  One of my colleagues recently interviewed some candidates for a job and one said they had very good Perl experience. Since my colleague didn't know Perl, he asked me for a critique of some code written (off-site) by that potential hire, so I had a look and told him my concerns (the main one was that it originally had no comments and it's not like we gave them enough time). However, the code works so I'm loathe to say no-go without some more input. Another concern is that this code basically looks exactly how I'd code it in C. It's been a while since I did Perl (and I didn't do a lot, I'm more a Python bod for quick scripts) but I seem to recall that it was a much more expressive language than what this guy used. I'm looking for input from real Perl coders, and suggestions for how it could be improved (and why a Perl coder should know that method of improvement). You can also wax lyrical about whether people who write one language in a totally different language should (or shouldn't be hired). I'm interested in your arguments but this question is primarily for a critique of the code. The spec was to successfully process a CSV file as follows and output the individual fields: User ID,Name , Level,Numeric ID pax, Pax Morgan ,admin,0 gt," Turner, George" rubbish,user,1 ms,"Mark \"X-Men\" Spencer","guest user",2 ab,, "user","3" The output was to be something like this (the potential hire's code actually output this): User ID,Name , Level,Numeric ID: [User ID] [Name] [Level] [Numeric ID] pax, Pax Morgan ,admin,0: [pax] [Pax Morgan] [admin] [0] gt," Turner, George " rubbish,user,1: [gt] [ Turner, George ] [user] [1] ms,"Mark \"X-Men\" Spencer","guest user",2: [ms] [Mark "X-Men" Spencer] [guest user] [2] ab,, "user","3": [ab] [] [user] [3] Here is the code they submitted: #!/usr/bin/perl # Open file. open (IN, "qq.in") || die "Cannot open qq.in"; # Process every line. while (<IN>) { chomp; $line = $_; print "$line:\n"; # Process every field in line. while ($line ne "") { # Skip spaces and start with empty field. if (substr ($line,0,1) eq " ") { $line = substr ($line,1); next; } $field = ""; $minlen = 0; # Detect quoted field or otherwise. if (substr ($line,0,1) eq "\"") { $line = substr ($line,1); $pastquote = 0; while ($line ne "") { # Special handling for quotes (\\ and \"). if (length ($line) >= 2) { if (substr ($line,0,2) eq "\\\"") { $field = $field . "\""; $line = substr ($line,2); next; } if (substr ($line,0,2) eq "\\\\") { $field = $field . "\\"; $line = substr ($line,2); next; } } # Detect closing quote. if (($pastquote == 0) && (substr ($line,0,1) eq "\"")) { $pastquote = 1; $line = substr ($line,1); $minlen = length ($field); next; } # Only worry about comma if past closing quote. if (($pastquote == 1) && (substr ($line,0,1) eq ",")) { $line = substr ($line,1); last; } $field = $field . substr ($line,0,1); $line = substr ($line,1); } } else { while ($line ne "") { if (substr ($line,0,1) eq ",") { $line = substr ($line,1); last; } if ($pastquote == 0) { $field = $field . substr ($line,0,1); } $line = substr ($line,1); } } # Strip trailing space. while ($field ne "") { if (length ($field) == $minlen) { last; } if (substr ($field,length ($field)-1,1) eq " ") { $field = substr ($field,0, length ($field)-1); next; } last; } print " [$field]\n"; } } close (IN);

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• Arquillian - Weld SE - getting NullPointerException

  - by Walter White

  I am new to Arquillian and want to get some basic testing working (inject a bean and assert it does something). Exception: ------------------------------------------------------------------------------- Test set: com.walterjwhite.test.TestCase ------------------------------------------------------------------------------- Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 1.231 sec <<< FAILURE! test(com.walterjwhite.test.TestCase) Time elapsed: 0.02 sec <<< ERROR! java.lang.RuntimeException: Could not inject members at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.injectClass(CDIInjectionEnricher.java:113) at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.enrich(CDIInjectionEnricher.java:61) at org.jboss.arquillian.impl.enricher.ClientTestEnricher.enrich(ClientTestEnricher.java:61) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.impl.core.EventContextImpl.invokeObservers(EventContextImpl.java:98) at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:80) at org.jboss.arquillian.impl.client.ContainerDeploymentContextHandler.createContext(ContainerDeploymentContextHandler.java:133) at org.jboss.arquillian.impl.client.ContainerDeploymentContextHandler.createBeforeContext(ContainerDeploymentContextHandler.java:115) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87) at org.jboss.arquillian.impl.TestContextHandler.createTestContext(TestContextHandler.java:82) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87) at org.jboss.arquillian.impl.TestContextHandler.createClassContext(TestContextHandler.java:68) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87) at org.jboss.arquillian.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:54) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90) at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87) at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126) at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:106) at org.jboss.arquillian.impl.EventTestRunnerAdaptor.before(EventTestRunnerAdaptor.java:85) at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:210) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:303) at org.jboss.arquillian.junit.Arquillian.access$300(Arquillian.java:45) at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:228) at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:173) at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:303) at org.jboss.arquillian.junit.Arquillian.access$300(Arquillian.java:45) at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:187) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:127) at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103) at $Proxy0.invoke(Unknown Source) at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150) at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69) Caused by: java.lang.NullPointerException at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.getBeanManager(CDIInjectionEnricher.java:51) at org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher.injectClass(CDIInjectionEnricher.java:100) ... 71 more TestCase class @RunWith(Arquillian.class) public class TestCase { @Deployment public static JavaArchive createDeployment() { return ShrinkWrap.create(JavaArchive.class).addClasses(TestEntity.class, Implementation.class) .addAsManifestResource(EmptyAsset.INSTANCE, ArchivePaths.create("beans.xml")); } @Inject Implementation implementation; @Test public void test() throws Exception { final TestEntity testEntity = implementation.create(); Assert.assertNotNull(testEntity); } } When I run this, I get a NullPointerException, the bean manager is null. It looks like I am missing a step, but from the examples, it looks like this is all I should need. Any ideas? Walter

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• Memory Troubles with UIImagePicker

  - by Dan Ray

  I'm building an app that has several different sections to it, all of which are pretty image-heavy. It ties in with my client's website and they're a "high-design" type outfit. One piece of the app is images uploaded from the camera or the library, and a tableview that shows a grid of thumbnails. Pretty reliably, when I'm dealing with the camera version of UIImagePickerControl, I get hit for low memory. If I bounce around that part of the app for a while, I occasionally and non-repeatably crash with "status:10 (SIGBUS)" in the debugger. On low memory warning, my root view controller for that aspect of the app goes to my data management singleton, cruises through the arrays of cached data, and kills the biggest piece, the image associated with each entry. Thusly: - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Low Memory Warning" message:@"Cleaning out events data" delegate:nil cancelButtonTitle:@"All right then." otherButtonTitles:nil]; [alert show]; [alert release]; NSInteger spaceSaved; DataManager *data = [DataManager sharedDataManager]; for (Event *event in data.eventList) { spaceSaved += [(NSData *)UIImagePNGRepresentation(event.image) length]; event.image = nil; spaceSaved -= [(NSData *)UIImagePNGRepresentation(event.image) length]; } NSString *titleString = [NSString stringWithFormat:@"Saved %d on event images", spaceSaved]; for (WondrMark *mark in data.wondrMarks) { spaceSaved += [(NSData *)UIImagePNGRepresentation(mark.image) length]; mark.image = nil; spaceSaved -= [(NSData *)UIImagePNGRepresentation(mark.image) length]; } NSString *messageString = [NSString stringWithFormat:@"And total %d on event and mark images", spaceSaved]; NSLog(@"%@ - %@", titleString, messageString); // Relinquish ownership any cached data, images, etc that aren't in use. } As you can see, I'm making a (poor) attempt to eyeball the memory space I'm freeing up. I know it's not telling me about the actual memory footprint of the UIImages themselves, but it gives me SOME numbers at least, so I can see that SOMETHING'S happening. (Sorry for the hamfisted way I build that NSLog message too--I was going to fire another UIAlertView, but realized it'd be more useful to log it.) Pretty reliably, after toodling around in the image portion of the app for a while, I'll pull up the camera interface and get the low memory UIAlertView like three or four times in quick succession. Here's the NSLog output from the last time I saw it: 2010-05-27 08:55:02.659 EverWondr[7974:207] Saved 109591 on event images - And total 1419756 on event and mark images wait_fences: failed to receive reply: 10004003 2010-05-27 08:55:08.759 EverWondr[7974:207] Saved 4 on event images - And total 392695 on event and mark images 2010-05-27 08:55:14.865 EverWondr[7974:207] Saved 4 on event images - And total 873419 on event and mark images 2010-05-27 08:55:14.969 EverWondr[7974:207] Saved 4 on event images - And total 4 on event and mark images 2010-05-27 08:55:15.064 EverWondr[7974:207] Saved 4 on event images - And total 4 on event and mark images And then pretty soon after that we get our SIGBUS exit. So that's the situation. Now my specific questions: THE time I see this happening is when the UIPickerView's camera iris shuts. I click the button to take the picture, it does the "click" animation, and Instruments shows my memory footprint going from about 10mb to about 25mb, and sitting there until the image is delivered to my UIViewController, where usage drops back to 10 or 11mb again. If we make it through that without a memory warning, we're golden, but most likely we don't. Anything I can do to make that not be so expensive? Second, I have NSZombies enabled. Am I understanding correctly that that's actually preventing memory from being freed? Am I subjecting my app to an unfair test environment? Third, is there some way to programmatically get my memory usage? Or at least the usage for a UIImage object? I've scoured the docs and don't see anything about that.

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• Strategy and AI for the game 'Proximity'

  - by smci

  'Proximity' is a strategy game of territorial domination similar to Othello, Go and Risk. Two players, uses a 10x12 hex grid. Game invented by Brian Cable in 2007. Seems to be a worthy game for discussing a) optimal strategy then b) how to build an AI Strategies are going to be probabilistic or heuristic-based, due to the randomness factor, and the high branching factor (starts out at 120). So it will be kind of hard to compare objectively. A compute time limit of 5s per turn seems reasonable. Game: Flash version here and many copies elsewhere on the web Rules: here Object: to have control of the most armies after all tiles have been placed. Each turn you received a randomly numbered tile (value between 1 and 20 armies) to place on any vacant board space. If this tile is adjacent to any ally tiles, it will strengthen each tile's defenses +1 (up to a max value of 20). If it is adjacent to any enemy tiles, it will take control over them if its number is higher than the number on the enemy tile. Thoughts on strategy: Here are some initial thoughts; setting the computer AI to Expert will probably teach a lot: minimizing your perimeter seems to be a good strategy, to prevent flips and minimize worst-case damage like in Go, leaving holes inside your formation is lethal, only more so with the hex grid because you can lose armies on up to 6 squares in one move low-numbered tiles are a liability, so place them away from your main territory, near the board edges and scattered. You can also use low-numbered tiles to plug holes in your formation, or make small gains along the perimeter which the opponent will not tend to bother attacking. a triangle formation of three pieces is strong since they mutually reinforce, and also reduce the perimeter Each tile can be flipped at most 6 times, i.e. when its neighbor tiles are occupied. Control of a formation can flow back and forth. Sometimes you lose part of a formation and plug any holes to render that part of the board 'dead' and lock in your territory/ prevent further losses. Low-numbered tiles are obvious-but-low-valued liabilities, but high-numbered tiles can be bigger liabilities if they get flipped (which is harder). One lucky play with a 20-army tile can cause a swing of 200 (from +100 to -100 armies). So tile placement will have both offensive and defensive considerations. Comment 1,2,4 seem to resemble a minimax strategy where we minimize the maximum expected possible loss (modified by some probabilistic consideration of the value ß the opponent can get from 1..20 i.e. a structure which can only be flipped by a ß=20 tile is 'nearly impregnable'.) I'm not clear what the implications of comments 3,5,6 are for optimal strategy. Interested in comments from Go, Chess or Othello players. (The sequel ProximityHD for XBox Live, allows 4-player -cooperative or -competitive local multiplayer increases the branching factor since you now have 5 tiles in your hand at any given time, of which you can only play one. Reinforcement of ally tiles is increased to +2 per ally.)

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• Flushing a queue using AMQP, Rabbit, and Ruby

  - by jeffshantz

  I'm developing a system in Ruby that is going to make use of RabbitMQ to send messages to a queue as it does some work. I am using: Ruby 1.9.1 Stable RabbitMQ 1.7.2 AMQP gem v0.6.7 (http://github.com/tmm1/amqp) Most of the examples I have seen on this gem have their publish calls in an EM.add_periodic_timer block. This doesn't work for what I suspect is a vast majority of use cases, and certainly not for mine. I need to publish a message as I complete some work, so putting a publish statement in an add_periodic_timer block doesn't suffice. So, I'm trying to figure out how to publish a few messages to a queue, and then "flush" it, so that any messages I've published are then delivered to my subscribers. To give you an idea of what I mean, consider the following publisher code: #!/usr/bin/ruby require 'rubygems' require 'mq' MESSAGES = ["hello","goodbye","test"] AMQP.start do queue = MQ.queue('testq') messages_published = 0 while (messages_published < 50) if (rand() < 0.4) message = MESSAGES[rand(MESSAGES.size)] puts "#{Time.now.to_s}: Publishing: #{message}" queue.publish(message) messages_published += 1 end sleep(0.1) end AMQP.stop do EM.stop end end So, this code simply loops, publishing a message with 40% probability on each iteration of the loop, and then sleeps for 0.1 seconds. It does this until 50 messages have been published, and then stops AMQP. Of course, this is just a proof of concept. Now, my subscriber code: #!/usr/bin/ruby require 'rubygems' require 'mq' AMQP.start do queue = MQ.queue('testq') queue.subscribe do |header, msg| puts "#{Time.now.to_s}: Received #{msg}" end end So, we just subscribe to the queue, and for each message received, we print it out. Great, except that the subscriber only receives all 50 messages when the publisher calls AMQP.stop. Here's the output from my publisher. It has been truncated in the middle for brevity: $ ruby publisher.rb 2010-04-14 21:45:42 -0400: Publishing: test 2010-04-14 21:45:42 -0400: Publishing: hello 2010-04-14 21:45:42 -0400: Publishing: test 2010-04-14 21:45:43 -0400: Publishing: test 2010-04-14 21:45:44 -0400: Publishing: test 2010-04-14 21:45:44 -0400: Publishing: goodbye 2010-04-14 21:45:45 -0400: Publishing: goodbye 2010-04-14 21:45:45 -0400: Publishing: test 2010-04-14 21:45:45 -0400: Publishing: test . . . 2010-04-14 21:45:55 -0400: Publishing: test 2010-04-14 21:45:55 -0400: Publishing: test 2010-04-14 21:45:55 -0400: Publishing: test 2010-04-14 21:45:55 -0400: Publishing: goodbye Next, the output from my subscriber: $ ruby consumer.rb 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received hello 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received goodbye 2010-04-14 21:45:56 -0400: Received goodbye 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received test . . . 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received test 2010-04-14 21:45:56 -0400: Received goodbye If you note the timestamps in the output, the subscriber only receives all of the messages once the publisher has stopped AMQP and exited. So, being an AMQP newb, how can I get my messages to deliver immediately? I tried putting AMQP.start and AMQP.stop in the body of the while loop of the publisher, but then only the first message gets delivered -- though strangely, if I turn on logging, there are no error messages reported by the server and the messages do get sent to the queue, but never get received by the subscriber. Suggestions would be much appreciated. Thanks for reading.

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• Freezes (not crashes) with GCD, blocks and Core Data

  - by Lukasz

  I have recently rewritten my Core Data driven database controller to use Grand Central Dispatch to manage fetching and importing in the background. Controller can operate on 2 NSManagedContext's: NSManagedObjectContext *mainMoc instance variable for main thread. this contexts is used only by quick access for UI by main thread or by dipatch_get_main_queue() global queue. NSManagedObjectContext *bgMoc for background tasks (importing and fetching data for NSFetchedresultsController for tables). This background tasks are fired ONLY by user defined queue: dispatch_queue_t bgQueue (instance variable in database controller object). Fetching data for tables is done in background to not block user UI when bigger or more complicated predicates are performed. Example fetching code for NSFetchedResultsController in my table view controllers: -(void)fetchData{ dispatch_async([CDdb db].bgQueue, ^{ NSError *error = nil; [[self.fetchedResultsController fetchRequest] setPredicate:self.predicate]; if (self.fetchedResultsController && ![self.fetchedResultsController performFetch:&error]) { NSSLog(@"Unresolved error in fetchData %@", error); } if (!initial_fetch_attampted)initial_fetch_attampted = YES; fetching = NO; dispatch_async(dispatch_get_main_queue(), ^{ [self.table reloadData]; [self.table scrollRectToVisible:CGRectMake(0, 0, 100, 20) animated:YES]; }); }); } // end of fetchData function bgMoc merges with mainMoc on save using NSManagedObjectContextDidSaveNotification: - (void)bgMocDidSave:(NSNotification *)saveNotification { // CDdb - bgMoc didsave - merging changes with main mainMoc dispatch_async(dispatch_get_main_queue(), ^{ [self.mainMoc mergeChangesFromContextDidSaveNotification:saveNotification]; // Extra notification for some other, potentially interested clients [[NSNotificationCenter defaultCenter] postNotificationName:DATABASE_SAVED_WITH_CHANGES object:saveNotification]; }); } - (void)mainMocDidSave:(NSNotification *)saveNotification { // CDdb - main mainMoc didSave - merging changes with bgMoc dispatch_async(self.bgQueue, ^{ [self.bgMoc mergeChangesFromContextDidSaveNotification:saveNotification]; }); } NSfetchedResultsController delegate has only one method implemented (for simplicity): - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { dispatch_async(dispatch_get_main_queue(), ^{ [self fetchData]; }); } This way I am trying to follow Apple recommendation for Core Data: 1 NSManagedObjectContext per thread. I know this pattern is not completely clean for at last 2 reasons: bgQueue not necessarily fires the same thread after suspension but since it is serial, it should not matter much (there is never 2 threads trying access bgMoc NSManagedObjectContext dedicated to it). Sometimes table view data source methods will ask NSFetchedResultsController for info from bgMoc (since fetch is done on bgQueue) like sections count, fetched objects in section count, etc.... Event with this flaws this approach works pretty well of the 95% of application running time until ... AND HERE GOES MY QUESTION: Sometimes, very randomly application freezes but not crashes. It does not response on any touch and the only way to get it back to live is to restart it completely (switching back to and from background does not help). No exception is thrown and nothing is printed to the console (I have Breakpoints set for all exception in Xcode). I have tried to debug it using Instruments (time profiles especially) to see if there is something hard going on on main thread but nothing is showing up. I am aware that GCD and Core Data are the main suspects here, but I have no idea how to track / debug this. Let me point out, that this also happens when I dispatch all the tasks to the queues asynchronously only (using dispatch_async everywhere). This makes me think it is not just standard deadlock. Is there any possibility or hints of how could I get more info what is going on? Some extra debug flags, Instruments magical tricks or build setting etc... Any suggestions on what could be the cause are very much appreciated as well as (or) pointers to how to implement background fetching for NSFetchedResultsController and background importing in better way.

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• HTTP error code 405: tomcat Url mapping issue

  - by Andrew

  I am having trouble POSTing to my java HTTPServlet. I am getting "HTTP Status 405 - HTTP method GET is not supported by this URL" from my tomcat server". When I debug the servlet the login method is never called. I think it's a url mapping issue within tomcat... web.xml <servlet-mapping> <servlet-name>faxcom</servlet-name> <url-pattern>/faxcom/*</url-pattern> </servlet-mapping> FaxcomService.java @Path("/rest") public class FaxcomService extends HttpServlet{ private FAXCOM_x0020_ServiceLocator service; private FAXCOM_x0020_ServiceSoap port; @GET @Produces("application/json") public String testGet() { return "{ \"got here\":true }"; } @POST @Path("/login") @Consumes("application/json") // @Produces("application/json") public Response login(LoginBean login) { ArrayList<ResultMessageBean> rm = new ArrayList<ResultMessageBean>(10); try { service = new FAXCOM_x0020_ServiceLocator(); service.setFAXCOM_x0020_ServiceSoapEndpointAddress("http://cd-faxserver/faxcom_ws/faxcomservice.asmx"); service.setMaintainSession(true); // enable sessions support port = service.getFAXCOM_x0020_ServiceSoap(); rm.add(new ResultMessageBean(port.logOn( "\\\\CD-Faxserver\\FaxcomQ_API", /* path to the queue */ login.getUserName(), /* username */ login.getPassword(), /* password */ login.getUserType() /* 2 = user conf user */ ))); } catch (RemoteException e) { e.printStackTrace(); } catch (ServiceException e) { e.printStackTrace(); } // return rm; return Response.status(201).entity(rm).build(); } @POST @Path("/newFaxMessage") @Consumes(MediaType.APPLICATION_JSON) @Produces(MediaType.APPLICATION_JSON) public ArrayList<ResultMessageBean> newFaxMessage(FaxBean fax) { ArrayList<ResultMessageBean> rm = new ArrayList<ResultMessageBean>(); try { rm.add(new ResultMessageBean(port.newFaxMessage( fax.getPriority(), /* priority: 0 - low, 1 - normal, 2 - high, 3 - urgent */ fax.getSendTime(), /* send time */ /* "0.0" - immediate */ /* "1.0" - offpeak */ /* "9/14/2007 5:12:11 PM" - to set specific time */ fax.getResolution(), /* resolution: 0 - low res, 1 - high res */ fax.getSubject(), /* subject */ fax.getCoverpage(), /* cover page: "" – default, “(none)� – no cover page */ fax.getMemo(), /* memo */ fax.getSenderName(), /* sender's name */ fax.getSenderFaxNumber(), /* sender's fax */ fax.getRecipients().get(0).getName(), /* recipient's name */ fax.getRecipients().get(0).getCompany(), /* recipient's company */ fax.getRecipients().get(0).getFaxNumber(), /* destination fax number */ fax.getRecipients().get(0).getVoiceNumber(), /* recipient's phone number */ fax.getRecipients().get(0).getAccountNumber() /* recipient's account number */ ))); if (fax.getRecipients().size() > 1) { for (int i = 1; i < fax.getRecipients().size(); i++) rm.addAll(addRecipient(fax.getRecipients().get(i))); } } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } return rm; } } Main.java private static void main(String[] args) { try { URL url = new URL("https://andrew-vm/faxcom/rest/login"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setRequestProperty("Content-Type", "application/json"); FileInputStream jsonDemo = new FileInputStream("login.txt"); OutputStream os = (OutputStream) conn.getOutputStream(); os.write(IOUtils.toByteArray(jsonDemo)); os.flush(); if (conn.getResponseCode() != 200) { throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode()); } BufferedReader br = new BufferedReader(new InputStreamReader( (conn.getInputStream()))); String output; System.out.println("Output from Server .... \n"); while ((output = br.readLine()) != null) { System.out.println(output); } // Don't want to disconnect - servletInstance will be destroyed // conn.disconnect(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } I am working from this tutorial: http://www.mkyong.com/webservices/jax-rs/restfull-java-client-with-java-net-url/

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• Java fatal error, don't know what it means

  - by Thomas King

  It happens at the same place in my code (albeit not the first time the method is executed) but I can't make head or tail of what is wrong. (Doubly so as it's code for a robot). Be most appreciative if someone can give me an idea of what kind of problem it is. I assume it's to do with threading (multi-threaded app) but I don't really know what?!? Worried as deadline for uni project is looming!!! The message: # A fatal error has been detected by the Java Runtime Environment: # SIGSEGV (0xb) at pc=0xb70f0ca7, pid=5065, tid=2145643376 # JRE version: 6.0_15-b03 Java VM: Java HotSpot(TM) Server VM (14.1-b02 mixed mode linux-x86 ) Problematic frame: V [libjvm.so+0x4c9ca7] # An error report file with more information is saved as: /home/thomas/workspace/sir13/hs_err_pid5065.log # If you would like to submit a bug report, please visit: http://java.sun.com/webapps/bugreport/crash.jsp # The log: # A fatal error has been detected by the Java Runtime Environment: # SIGSEGV (0xb) at pc=0xb70f0ca7, pid=5065, tid=2145643376 # JRE version: 6.0_15-b03 Java VM: Java HotSpot(TM) Server VM (14.1-b02 mixed mode linux-x86 ) Problematic frame: V [libjvm.so+0x4c9ca7] # If you would like to submit a bug report, please visit: http://java.sun.com/webapps/bugreport/crash.jsp # --------------- T H R E A D --------------- Current thread (0x0904ec00): JavaThread "CompilerThread1" daemon [_thread_in_native, id=5078, stack(0x7fdbe000,0x7fe3f000)] siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x00000004 Registers: EAX=0x00000000, EBX=0xb733d720, ECX=0x000003b4, EDX=0x00000000 ESP=0x7fe3bf30, EBP=0x7fe3bf78, ESI=0x7fe3c250, EDI=0x7e9a7790 EIP=0xb70f0ca7, CR2=0x00000004, EFLAGS=0x00010283 Top of Stack: (sp=0x7fe3bf30) 0x7fe3bf30: 00020008 7ec8de5c 7fe3c250 00000000 0x7fe3bf40: 7f610451 00001803 7e9a7790 000003f5 0x7fe3bf50: 7e920030 7f239910 7f23b349 7f23b348 0x7fe3bf60: 7f550e35 7fe3c250 0000021b b733d720 0x7fe3bf70: 000003bc 7f23db10 7fe3bfc8 b70f0997 0x7fe3bf80: 7fe3c240 7f23db10 00000000 00000002 0x7fe3bf90: 00000000 7fe3c1b0 00000000 00000000 0x7fe3bfa0: 00004000 00000020 7ec88870 00000002 Instructions: (pc=0xb70f0ca7) 0xb70f0c97: 7d 08 8b 87 c8 02 00 00 89 c7 8b 45 c4 8b 14 87 0xb70f0ca7: 8b 42 04 8b 00 85 c0 75 22 8b 4e 04 8b 52 1c 39 Stack: [0x7fdbe000,0x7fe3f000], sp=0x7fe3bf30, free space=503k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [libjvm.so+0x4c9ca7] V [libjvm.so+0x4c9997] V [libjvm.so+0x4c6e23] V [libjvm.so+0x25b75f] V [libjvm.so+0x2585df] V [libjvm.so+0x1f2c2f] V [libjvm.so+0x260ceb] V [libjvm.so+0x260609] V [libjvm.so+0x617286] V [libjvm.so+0x6108fe] V [libjvm.so+0x531c4e] C [libpthread.so.0+0x580e] Current CompileTask: C2:133 ! BehaviourLeftUnexplored.action()V (326 bytes) --------------- P R O C E S S --------------- Java Threads: ( = current thread ) 0x08fb5400 JavaThread "DestroyJavaVM" [_thread_blocked, id=5066, stack(0xb6bb0000,0xb6c01000)] 0x09213c00 JavaThread "Thread-4" [_thread_blocked, id=5085, stack(0x7eeaf000,0x7ef00000)] 0x09212c00 JavaThread "Thread-3" [_thread_in_Java, id=5084, stack(0x7f863000,0x7f8b4000)] 0x09206800 JavaThread "AWT-XAWT" daemon [_thread_in_native, id=5083, stack(0x7f8b4000,0x7f905000)] 0x091b7400 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=5082, stack(0x7f93e000,0x7f98f000)] 0x09163c00 JavaThread "Thread-0" [_thread_in_native, id=5081, stack(0x7fc87000,0x7fcd8000)] 0x09050c00 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=5079, stack(0x7fd6d000,0x7fdbe000)] =0x0904ec00 JavaThread "CompilerThread1" daemon [_thread_in_native, id=5078, stack(0x7fdbe000,0x7fe3f000)] 0x0904c000 JavaThread "CompilerThread0" daemon [_thread_blocked, id=5077, stack(0x7fe3f000,0x7fec0000)] 0x0904a800 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=5076, stack(0x7fec0000,0x7ff11000)] 0x09036c00 JavaThread "Finalizer" daemon [_thread_blocked, id=5075, stack(0x7ff57000,0x7ffa8000)] 0x09035400 JavaThread "Reference Handler" daemon [_thread_blocked, id=5074, stack(0x7ffa8000,0x7fff9000)] Other Threads: 0x09031400 VMThread [stack: 0x7fff9000,0x8007a000] [id=5073] 0x09052800 WatcherThread [stack: 0x7fcec000,0x7fd6d000] [id=5080] VM state:not at safepoint (normal execution) VM Mutex/Monitor currently owned by a thread: None Heap PSYoungGen total 46784K, used 32032K [0xae650000, 0xb3440000, 0xb3a50000) eden space 46720K, 68% used [0xae650000,0xb0588f48,0xb13f0000) from space 64K, 95% used [0xb3390000,0xb339f428,0xb33a0000) to space 384K, 0% used [0xb33e0000,0xb33e0000,0xb3440000) PSOldGen total 43008K, used 20872K [0x84650000, 0x87050000, 0xae650000) object space 43008K, 48% used [0x84650000,0x85ab2308,0x87050000) PSPermGen total 16384K, used 5115K [0x80650000, 0x81650000, 0x84650000) object space 16384K, 31% used [0x80650000,0x80b4ec30,0x81650000) Dynamic libraries: 08048000-08052000 r-xp 00000000 08:05 34708 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/bin/java 08052000-08053000 rwxp 00009000 08:05 34708 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/bin/java 08faf000-09220000 rwxp 00000000 00:00 0 [heap] 7e900000-7e9f9000 rwxp 00000000 00:00 0 7e9f9000-7ea00000 ---p 00000000 00:00 0 7ea00000-7ea41000 rwxp 00000000 00:00 0 7ea41000-7eb00000 ---p 00000000 00:00 0 7eb00000-7ebfc000 rwxp 00000000 00:00 0 7ebfc000-7ec00000 ---p 00000000 00:00 0 7ec00000-7ecf7000 rwxp 00000000 00:00 0 7ecf7000-7ed00000 ---p 00000000 00:00 0 7ed00000-7ede7000 rwxp 00000000 00:00 0 7ede7000-7ee00000 ---p 00000000 00:00 0 7eeaf000-7eeb2000 ---p 00000000 00:00 0 7eeb2000-7ef00000 rwxp 00000000 00:00 0 7ef00000-7eff9000 rwxp 00000000 00:00 0 7eff9000-7f000000 ---p 00000000 00:00 0 7f100000-7f1f6000 rwxp 00000000 00:00 0 7f1f6000-7f200000 ---p 00000000 00:00 0 7f200000-7f2fc000 rwxp 00000000 00:00 0 7f2fc000-7f300000 ---p 00000000 00:00 0 7f300000-7f4fe000 rwxp 00000000 00:00 0 7f4fe000-7f500000 ---p 00000000 00:00 0 7f500000-7f5fb000 rwxp 00000000 00:00 0 7f5fb000-7f600000 ---p 00000000 00:00 0 7f600000-7f6f9000 rwxp 00000000 00:00 0 7f6f9000-7f700000 ---p 00000000 00:00 0 7f700000-7f800000 rwxp 00000000 00:00 0 7f830000-7f836000 r-xs 00000000 08:05 241611 /var/cache/fontconfig/945677eb7aeaf62f1d50efc3fb3ec7d8-x86.cache-2 7f836000-7f838000 r-xs 00000000 08:05 241612 /var/cache/fontconfig/99e8ed0e538f840c565b6ed5dad60d56-x86.cache-2 7f838000-7f83b000 r-xs 00000000 08:05 241620 /var/cache/fontconfig/e383d7ea5fbe662a33d9b44caf393297-x86.cache-2 7f83b000-7f846000 r-xs 00000000 08:05 241600 /var/cache/fontconfig/0f34bcd4b6ee430af32735b75db7f02b-x86.cache-2 7f863000-7f866000 ---p 00000000 00:00 0 7f866000-7f8b4000 rwxp 00000000 00:00 0 7f8b4000-7f8b7000 ---p 00000000 00:00 0 7f8b7000-7f905000 rwxp 00000000 00:00 0 7f905000-7f909000 r-xp 00000000 08:05 5012 /usr/lib/libXfixes.so.3.1.0 7f909000-7f90a000 r-xp 00003000 08:05 5012 /usr/lib/libXfixes.so.3.1.0 7f90a000-7f90b000 rwxp 00004000 08:05 5012 /usr/lib/libXfixes.so.3.1.0 7f90b000-7f913000 r-xp 00000000 08:05 5032 /usr/lib/libXrender.so.1.3.0 7f913000-7f914000 r-xp 00007000 08:05 5032 /usr/lib/libXrender.so.1.3.0 7f914000-7f915000 rwxp 00008000 08:05 5032 /usr/lib/libXrender.so.1.3.0 7f915000-7f91e000 r-xp 00000000 08:05 5004 /usr/lib/libXcursor.so.1.0.2 7f91e000-7f91f000 r-xp 00008000 08:05 5004 /usr/lib/libXcursor.so.1.0.2 7f91f000-7f920000 rwxp 00009000 08:05 5004 /usr/lib/libXcursor.so.1.0.2 7f92f000-7f931000 r-xs 00000000 08:05 241622 /var/cache/fontconfig/f24b2111ab8703b4e963115a8cf14259-x86.cache-2 7f931000-7f932000 r-xs 00000000 08:05 241606 /var/cache/fontconfig/4c73fe0c47614734b17d736dbde7580a-x86.cache-2 7f932000-7f936000 r-xs 00000000 08:05 241599 /var/cache/fontconfig/062808c12e6e608270f93bb230aed730-x86.cache-2 7f936000-7f93e000 r-xs 00000000 08:05 241617 /var/cache/fontconfig/d52a8644073d54c13679302ca1180695-x86.cache-2 7f93e000-7f941000 ---p 00000000 00:00 0 7f941000-7f98f000 rwxp 00000000 00:00 0 7f98f000-7fa0e000 r-xp 00000000 08:05 34755 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libfontmanager.so 7fa0e000-7fa19000 rwxp 0007e000 08:05 34755 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libfontmanager.so 7fa19000-7fa1d000 rwxp 00000000 00:00 0 7fa1d000-7fa21000 r-xp 00000000 08:05 5008 /usr/lib/libXdmcp.so.6.0.0 7fa21000-7fa22000 rwxp 00003000 08:05 5008 /usr/lib/libXdmcp.so.6.0.0 7fa22000-7fa3e000 r-xp 00000000 08:05 6029 /usr/lib/libxcb.so.1.1.0 7fa3e000-7fa3f000 r-xp 0001c000 08:05 6029 /usr/lib/libxcb.so.1.1.0 7fa3f000-7fa40000 rwxp 0001d000 08:05 6029 /usr/lib/libxcb.so.1.1.0 7fa40000-7fa42000 r-xp 00000000 08:05 4997 /usr/lib/libXau.so.6.0.0 7fa42000-7fa43000 r-xp 00001000 08:05 4997 /usr/lib/libXau.so.6.0.0 7fa43000-7fa44000 rwxp 00002000 08:05 4997 /usr/lib/libXau.so.6.0.0 7fa44000-7fb6e000 r-xp 00000000 08:05 4991 /usr/lib/libX11.so.6.2.0 7fb6e000-7fb6f000 ---p 0012a000 08:05 4991 /usr/lib/libX11.so.6.2.0 7fb6f000-7fb70000 r-xp 0012a000 08:05 4991 /usr/lib/libX11.so.6.2.0 7fb70000-7fb72000 rwxp 0012b000 08:05 4991 /usr/lib/libX11.so.6.2.0 7fb72000-7fb73000 rwxp 00000000 00:00 0 7fb73000-7fb81000 r-xp 00000000 08:05 5010 /usr/lib/libXext.so.6.4.0 7fb81000-7fb82000 r-xp 0000d000 08:05 5010 /usr/lib/libXext.so.6.4.0 7fb82000-7fb83000 rwxp 0000e000 08:05 5010 /usr/lib/libXext.so.6.4.0 7fb83000-7fb84000 r-xs 00000000 08:05 241614 /var/cache/fontconfig/c05880de57d1f5e948fdfacc138775d9-x86.cache-2 7fb84000-7fb87000 r-xs 00000000 08:05 241613 /var/cache/fontconfig/a755afe4a08bf5b97852ceb7400b47bc-x86.cache-2 7fb87000-7fb8a000 r-xs 00000000 08:05 241608 /var/cache/fontconfig/6d41288fd70b0be22e8c3a91e032eec0-x86.cache-2 7fb8a000-7fb92000 r-xs 00000000 08:05 219560 /var/cache/fontconfig/e13b20fdb08344e0e664864cc2ede53d-x86.cache-2 7fb92000-7fbd5000 r-xp 00000000 08:05 34752 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/xawt/libmawt.so 7fbd5000-7fbd7000 rwxp 00043000 08:05 34752 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/xawt/libmawt.so 7fbd7000-7fbd8000 rwxp 00000000 00:00 0 7fbd8000-7fc5c000 r-xp 00000000 08:05 34750 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libawt.so 7fc5c000-7fc63000 rwxp 00084000 08:05 34750 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libawt.so 7fc63000-7fc87000 rwxp 00000000 00:00 0 7fc87000-7fc8a000 ---p 00000000 00:00 0 7fc8a000-7fcd8000 rwxp 00000000 00:00 0 7fcd8000-7fceb000 r-xp 00000000 08:05 34739 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libnet.so 7fceb000-7fcec000 rwxp 00013000 08:05 34739 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libnet.so 7fcec000-7fced000 ---p 00000000 00:00 0 7fced000-7fd6d000 rwxp 00000000 00:00 0 7fd6d000-7fd70000 ---p 00000000 00:00 0 7fd70000-7fdbe000 rwxp 00000000 00:00 0 7fdbe000-7fdc1000 ---p 00000000 00:00 0 7fdc1000-7fe3f000 rwxp 00000000 00:00 0 7fe3f000-7fe42000 ---p 00000000 00:00 0 7fe42000-7fec0000 rwxp 00000000 00:00 0 7fec0000-7fec3000 ---p 00000000 00:00 0 7fec3000-7ff11000 rwxp 00000000 00:00 0 7ff11000-7ff18000 r-xs 00000000 08:05 134616 /usr/lib/gconv/gconv-modules.cache 7ff18000-7ff57000 r-xp 00000000 08:05 136279 /usr/lib/locale/en_GB.utf8/LC_CTYPE 7ff57000-7ff5a000 ---p 00000000 00:00 0 7ff5a000-7ffa8000 rwxp 00000000 00:00 0 7ffa8000-7ffab000 ---p 00000000 00:00 0 7ffab000-7fff9000 rwxp 00000000 00:00 0 7fff9000-7fffa000 ---p 00000000 00:00 0 7fffa000-800ad000 rwxp 00000000 00:00 0 800ad000-80243000 r-xs 02fb3000 08:05 34883 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/rt.jar 80243000-80244000 ---p 00000000 00:00 0 80244000-802c4000 rwxp 00000000 00:00 0 802c4000-802c5000 ---p 00000000 00:00 0 802c5000-8034d000 rwxp 00000000 00:00 0 8034d000-80365000 rwxp 00000000 00:00 0 80365000-8037a000 rwxp 00000000 00:00 0 8037a000-804b5000 rwxp 00000000 00:00 0 804b5000-804bd000 rwxp 00000000 00:00 0 804bd000-804d5000 rwxp 00000000 00:00 0 804d5000-804ea000 rwxp 00000000 00:00 0 804ea000-80625000 rwxp 00000000 00:00 0 80625000-8064c000 rwxp 00000000 00:00 0 8064c000-8064f000 rwxp 00000000 00:00 0 8064f000-81650000 rwxp 00000000 00:00 0 81650000-84650000 rwxp 00000000 00:00 0 84650000-87050000 rwxp 00000000 00:00 0 87050000-ae650000 rwxp 00000000 00:00 0 ae650000-b3440000 rwxp 00000000 00:00 0 b3440000-b3a50000 rwxp 00000000 00:00 0 b3a50000-b3a52000 r-xs 00000000 08:05 241602 /var/cache/fontconfig/2c5ba8142dffc8bf0377700342b8ca1a-x86.cache-2 b3a52000-b3a5b000 r-xp 00000000 08:05 5018 /usr/lib/libXi.so.6.0.0 b3a5b000-b3a5c000 r-xp 00008000 08:05 5018 /usr/lib/libXi.so.6.0.0 b3a5c000-b3a5d000 rwxp 00009000 08:05 5018 /usr/lib/libXi.so.6.0.0 b3a5d000-b3a66000 rwxp 00000000 00:00 0 b3a66000-b3b1d000 rwxp 00000000 00:00 0 b3b1d000-b3d5d000 rwxp 00000000 00:00 0 b3d5d000-b6b1d000 rwxp 00000000 00:00 0 b6b1d000-b6b2c000 r-xp 00000000 08:05 34735 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libzip.so b6b2c000-b6b2e000 rwxp 0000e000 08:05 34735 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libzip.so b6b2e000-b6b38000 r-xp 00000000 08:05 1042 /lib/tls/i686/cmov/libnss_files-2.10.1.so b6b38000-b6b39000 r-xp 00009000 08:05 1042 /lib/tls/i686/cmov/libnss_files-2.10.1.so b6b39000-b6b3a000 rwxp 0000a000 08:05 1042 /lib/tls/i686/cmov/libnss_files-2.10.1.so b6b3a000-b6b43000 r-xp 00000000 08:05 1055 /lib/tls/i686/cmov/libnss_nis-2.10.1.so b6b43000-b6b44000 r-xp 00008000 08:05 1055 /lib/tls/i686/cmov/libnss_nis-2.10.1.so b6b44000-b6b45000 rwxp 00009000 08:05 1055 /lib/tls/i686/cmov/libnss_nis-2.10.1.so b6b45000-b6b4b000 r-xp 00000000 08:05 1028 /lib/tls/i686/cmov/libnss_compat-2.10.1.so b6b4b000-b6b4c000 r-xp 00005000 08:05 1028 /lib/tls/i686/cmov/libnss_compat-2.10.1.so b6b4c000-b6b4d000 rwxp 00006000 08:05 1028 /lib/tls/i686/cmov/libnss_compat-2.10.1.so b6b4d000-b6b54000 r-xs 00035000 08:05 304369 /home/thomas/workspace/sir13/javaclient/jars/javaclient.jar b6b54000-b6b5c000 rwxs 00000000 08:05 393570 /tmp/hsperfdata_thomas/5065 b6b5c000-b6b6f000 r-xp 00000000 08:05 1020 /lib/tls/i686/cmov/libnsl-2.10.1.so b6b6f000-b6b70000 r-xp 00012000 08:05 1020 /lib/tls/i686/cmov/libnsl-2.10.1.so b6b70000-b6b71000 rwxp 00013000 08:05 1020 /lib/tls/i686/cmov/libnsl-2.10.1.so b6b71000-b6b73000 rwxp 00000000 00:00 0 b6b73000-b6b77000 r-xp 00000000 08:05 5038 /usr/lib/libXtst.so.6.1.0 b6b77000-b6b78000 r-xp 00004000 08:05 5038 /usr/lib/libXtst.so.6.1.0 b6b78000-b6b79000 rwxp 00005000 08:05 5038 /usr/lib/libXtst.so.6.1.0 b6b79000-b6b7f000 r-xp 00000000 08:05 34723 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/native_threads/libhpi.so b6b7f000-b6b80000 rwxp 00006000 08:05 34723 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/native_threads/libhpi.so b6b80000-b6b81000 rwxp 00000000 00:00 0 b6b81000-b6b82000 r-xp 00000000 00:00 0 b6b82000-b6ba5000 r-xp 00000000 08:05 34733 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libjava.so b6ba5000-b6ba7000 rwxp 00023000 08:05 34733 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libjava.so b6ba7000-b6bae000 r-xp 00000000 08:05 1733 /lib/tls/i686/cmov/librt-2.10.1.so b6bae000-b6baf000 r-xp 00006000 08:05 1733 /lib/tls/i686/cmov/librt-2.10.1.so b6baf000-b6bb0000 rwxp 00007000 08:05 1733 /lib/tls/i686/cmov/librt-2.10.1.so b6bb0000-b6bb3000 ---p 00000000 00:00 0 b6bb3000-b6c01000 rwxp 00000000 00:00 0 b6c01000-b6c25000 r-xp 00000000 08:05 1016 /lib/tls/i686/cmov/libm-2.10.1.so b6c25000-b6c26000 r-xp 00023000 08:05 1016 /lib/tls/i686/cmov/libm-2.10.1.so b6c26000-b6c27000 rwxp 00024000 08:05 1016 /lib/tls/i686/cmov/libm-2.10.1.so b6c27000-b72f4000 r-xp 00000000 08:05 34724 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/server/libjvm.so b72f4000-b7341000 rwxp 006cc000 08:05 34724 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/server/libjvm.so b7341000-b7765000 rwxp 00000000 00:00 0 b7765000-b78a3000 r-xp 00000000 08:05 967 /lib/tls/i686/cmov/libc-2.10.1.so b78a3000-b78a4000 ---p 0013e000 08:05 967 /lib/tls/i686/cmov/libc-2.10.1.so b78a4000-b78a6000 r-xp 0013e000 08:05 967 /lib/tls/i686/cmov/libc-2.10.1.so b78a6000-b78a7000 rwxp 00140000 08:05 967 /lib/tls/i686/cmov/libc-2.10.1.so b78a7000-b78aa000 rwxp 00000000 00:00 0 b78aa000-b78ac000 r-xp 00000000 08:05 1014 /lib/tls/i686/cmov/libdl-2.10.1.so b78ac000-b78ad000 r-xp 00001000 08:05 1014 /lib/tls/i686/cmov/libdl-2.10.1.so b78ad000-b78ae000 rwxp 00002000 08:05 1014 /lib/tls/i686/cmov/libdl-2.10.1.so b78ae000-b78b5000 r-xp 00000000 08:05 34734 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/jli/libjli.so b78b5000-b78b7000 rwxp 00006000 08:05 34734 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/jli/libjli.so b78b7000-b78b8000 rwxp 00000000 00:00 0 b78b8000-b78cd000 r-xp 00000000 08:05 1081 /lib/tls/i686/cmov/libpthread-2.10.1.so b78cd000-b78ce000 r-xp 00014000 08:05 1081 /lib/tls/i686/cmov/libpthread-2.10.1.so b78ce000-b78cf000 rwxp 00015000 08:05 1081 /lib/tls/i686/cmov/libpthread-2.10.1.so b78cf000-b78d1000 rwxp 00000000 00:00 0 b78d1000-b78d2000 r-xs 00000000 08:05 161622 /var/cache/fontconfig/4794a0821666d79190d59a36cb4f44b5-x86.cache-2 b78d2000-b78d4000 r-xs 00000000 08:05 241610 /var/cache/fontconfig/7ef2298fde41cc6eeb7af42e48b7d293-x86.cache-2 b78d4000-b78df000 r-xp 00000000 08:05 34732 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libverify.so b78df000-b78e0000 rwxp 0000b000 08:05 34732 /usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/libverify.so b78e0000-b78e2000 rwxp 00000000 00:00 0 b78e2000-b78e3000 r-xp 00000000 00:00 0 [vdso] b78e3000-b78fe000 r-xp 00000000 08:05 64 /lib/ld-2.10.1.so b78fe000-b78ff000 r-xp 0001a000 08:05 64 /lib/ld-2.10.1.so b78ff000-b7900000 rwxp 0001b000 08:05 64 /lib/ld-2.10.1.so bfc33000-bfc48000 rwxp 00000000 00:00 0 [stack] VM Arguments: jvm_args: -Dfile.encoding=UTF-8 java_command: Main Launcher Type: SUN_STANDARD Environment Variables: PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games USERNAME=thomas LD_LIBRARY_PATH=/usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/server:/usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386:/usr/lib/jvm/java-6-sun-1.6.0.15/jre/../lib/i386:/usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386/client:/usr/lib/jvm/java-6-sun-1.6.0.15/jre/lib/i386:/usr/lib/xulrunner-addons:/usr/lib/xulrunner-addons SHELL=/bin/bash DISPLAY=:0.0 Signal Handlers: SIGSEGV: [libjvm.so+0x650690], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGBUS: [libjvm.so+0x650690], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGFPE: [libjvm.so+0x52f580], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGPIPE: [libjvm.so+0x52f580], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGXFSZ: [libjvm.so+0x52f580], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGILL: [libjvm.so+0x52f580], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGUSR1: SIG_DFL, sa_mask[0]=0x00000000, sa_flags=0x00000000 SIGUSR2: [libjvm.so+0x532170], sa_mask[0]=0x00000004, sa_flags=0x10000004 SIGHUP: [libjvm.so+0x531ea0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGINT: [libjvm.so+0x531ea0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGTERM: [libjvm.so+0x531ea0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGQUIT: [libjvm.so+0x531ea0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 --------------- S Y S T E M --------------- OS:squeeze/sid uname:Linux 2.6.31-20-generic #57-Ubuntu SMP Mon Feb 8 09:05:19 UTC 2010 i686 libc:glibc 2.10.1 NPTL 2.10.1 rlimit: STACK 8192k, CORE 0k, NPROC infinity, NOFILE 1024, AS infinity load average:1.07 0.55 0.23 CPU:total 2 (2 cores per cpu, 1 threads per core) family 6 model 15 stepping 13, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3 Memory: 4k page, physical 3095836k(1519972k free), swap 1261060k(1261060k free) vm_info: Java HotSpot(TM) Server VM (14.1-b02) for linux-x86 JRE (1.6.0_15-b03), built on Jul 2 2009 15:49:13 by "java_re" with gcc 3.2.1-7a (J2SE release) time: Mon Mar 22 12:08:40 2010 elapsed time: 21 seconds

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• How to overcome shortcomings in reporting from EAV database?

  - by David Archer

  The major shortcomings with Entity-Attribute-Value database designs in SQL all seem to be related to being able to query and report on the data efficiently and quickly. Most of the information I read on the subject warn against implementing EAV due to these problems and the commonality of querying/reporting for almost all applications. I am currently designing a system where almost all the fields necessary for data storage are not known at design/compile time and are defined by the end-user of the system. EAV seems like a good fit for this requirement but due to the problems I've read about, I am hesitant in implementing it as there are also some pretty heavy reporting requirements for this system as well. I think I've come up with a way around this but would like to pose the question to the SO community. Given that typical normalized database (OLTP) still isn't always the best option for running reports, a good practice seems to be having a "reporting" database (OLAP) where the data from the normalized database is copied to, indexed extensively, and possibly denormalized for easier querying. Could the same idea be used to work around the shortcomings of an EAV design? The main downside I see are the increased complexity of transferring the data from the EAV database to reporting as you may end up having to alter the tables in the reporting database as new fields are defined in the EAV database. But that is hardly impossible and seems to be an acceptable tradeoff for the increased flexibility given by the EAV design. This downside also exists if I use a non-SQL data store (i.e. CouchDB or similar) for the main data storage since all the standard reporting tools are expecting a SQL backend to query against. Do the issues with EAV systems mostly go away if you have a seperate reporting database for querying? EDIT: Thanks for the comments so far. One of the important things about the system I'm working on it that I'm really only talking about using EAV for one of the entities, not everything in the system. The whole gist of the system is to be able to pull data from multiple disparate sources that are not known ahead of time and crunch the data to come up with some "best known" data about a particular entity. So every "field" I'm dealing with is multi-valued and I'm also required to track history for each. The normalized design for this ends up being 1 table per field which makes querying it kind of painful anyway. Here are the table schemas and sample data I'm looking at (obviously changed from what I'm working on but I think it illustrates the point well): EAV Tables Person ------------------- - Id - Name - ------------------- - 123 - Joe Smith - ------------------- Person_Value ------------------------------------------------------------------- - PersonId - Source - Field - Value - EffectiveDate - ------------------------------------------------------------------- - 123 - CIA - HomeAddress - 123 Cherry Ln - 2010-03-26 - - 123 - DMV - HomeAddress - 561 Stoney Rd - 2010-02-15 - - 123 - FBI - HomeAddress - 676 Lancas Dr - 2010-03-01 - ------------------------------------------------------------------- Reporting Table Person_Denormalized ---------------------------------------------------------------------------------------- - Id - Name - HomeAddress - HomeAddress_Confidence - HomeAddress_EffectiveDate - ---------------------------------------------------------------------------------------- - 123 - Joe Smith - 123 Cherry Ln - 0.713 - 2010-03-26 - ---------------------------------------------------------------------------------------- Normalized Design Person ------------------- - Id - Name - ------------------- - 123 - Joe Smith - ------------------- Person_HomeAddress ------------------------------------------------------ - PersonId - Source - Value - Effective Date - ------------------------------------------------------ - 123 - CIA - 123 Cherry Ln - 2010-03-26 - - 123 - DMV - 561 Stoney Rd - 2010-02-15 - - 123 - FBI - 676 Lancas Dr - 2010-03-01 - ------------------------------------------------------ The "Confidence" field here is generated using logic that cannot be expressed easily (if at all) using SQL so my most common operation besides inserting new values will be pulling ALL data about a person for all fields so I can generate the record for the reporting table. This is actually easier in the EAV model as I can do a single query. In the normalized design, I end up having to do 1 query per field to avoid a massive cartesian product from joining them all together.

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• Does anyone have database, programming language/framework suggestions for a GUI point of sale system

  - by Jason Down

  Our company has a point of sale system with many extras, such as ordering and receiving functionality, sales and order history etc. Our main issue is that the system was not designed properly from the ground up, so it takes too long to make fixes and handle requests from our customers. Also, the current technology we are using (Progress database, Progress 4GL for the language) incurs quite a bit of licensing expenses on our customers due to mutli-user license fees for database connections etc. After a lot of discussion it is looking like we will probably start over from scratch (while maintaining the current product at least for the time being). We are looking for a couple of things: Create the system with a nice GUI front end (it is currently CHUI and the application was not built in a way that allows us to redesign the front end... no layering or separation of business logic and gui...shudder). Create the system with the ability to modularize different functionality so the product doesn't have to include all features. This would keep the cost down for our current customers that want basic functionality and a lower price tag. The bells and whistles would be available for those that would want them. Use proper design patterns to make the product easy to add or change any part at any time (i.e. change the database or change the front end without needing to rewrite the application or most of it). This is a problem today because the Progress 4GL code is directly compiled against the database. Small changes in the database requires lots of code recompiling. Our new system will be Linux based, with a possibility of a client application providing functionality from one or more windows boxes. So what I'm looking for is any suggestions on which database and/or framework or programming language(s) someone might recommend for this sort of product. Anyone that has experience in this field might be able to point us in the right direction or even have some ideas of what to avoid. We have considered .NET and SQL Express (we don't need an enterprise level DB), but that would limit us to windows (as far as I know anyway). I have heard of Mono for writing .NET code in a Linux environment, but I don't know much about it yet. We've also considered a Java and MySql based implementation. To summarize we are looking to do the following: Keep licensing costs down on the technology we will use to develop the product (Oracle, yikes! MySQL, nice.) Deliver a solution that is easily maintainable and supportable. A solution that has a component capable of running on "old" hardware through a CHUI front end. (some of our customers have 40+ terminals which would be a ton of cash in order to convert over to a PC). Suggestions would be appreciated. Thanks [UPDATE] I should note that we are currently performing a total cost analysis. This question is intended to give us a couple of "educated" options to look into to include in or analysis. Anyone who could share experiences/suggestions about client/server setups would be appreciated (not just those who have experience with point of sale systems... that would just be a bonus).

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• Unresolved compilation problems -- can't use .jar files that I have created

  - by Mike

  I created a few .jar files and am trying to access them in another application - I have tried to use both Eclipse and IntelliJ and experience the same issue: java.lang.Error: Unresolved compilation problems: The import com.XXXX.XXXXXXXXX.project2 cannot be resolved The import com.XXXX.XXXXXXXXX.project2 cannot be resolved BeanFactory cannot be resolved to a type Author cannot be resolved to a type AuthorFactoryImpl cannot be resolved to a type Author cannot be resolved to a type Author cannot be resolved to a type I have been using Maven during this process and the jars compile fine. I have included them on the file path using both the Maven .pom file and directly assigning them. I also have unassigned the direct file path and left the reference in Maven and vise versa -- no difference. See below .jar file class info: file structure: Author.java BeanWithIdentityInterface Books Subject ie: Interface: package com.XXXX.training; /** * Created with IntelliJ IDEA. * User: kBPersonal * Date: 11/5/12 * Time: 3:16 PM * */ public interface BeanWithIdentityInterface <I> { I getId(); } Author.java: package com.XXXX.training; /** * Created with IntelliJ IDEA. * User: kBPersonal * Date: 10/25/12 * Time: 12:03 PM */ public class Author implements BeanWithIdentityInterface <Integer>{ private Integer id = null; private String name = null; private String picture = null; private String bio = null; public Author(Integer id, String bio, String name, String picture) { this.id = id; this.bio = bio; this.name = name; this.picture = picture; } public Author (){} @Override public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPicture() { return picture; } public void setPicture(String picture) { this.picture = picture; } public String getBio() { return bio; } public void setBio(String bio) { this.bio = bio; } @Override public String toString() { return "\n\tAuthor Id: "+this.getId() + " | Bio:"+ this.getBio()+ " | Name:"+ this.getName()+ " | Picture: "+ this.getPicture(); } } implementing Servlet: package com.acentia.training.project3.controller; import com.acentia.training.*; import com.acentia.training.project2.AuthorFactoryImpl; import com.acentia.training.project2.BeanFactory; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; /** * Created with IntelliJ IDEA. * User: kBPersonal * Date: 11/11/12 * Time: 6:34 PM * */ public class ListAuthorServlet extends AbstractBaseServlet { private static final long serialVersionUID = -6934109551750492182L; public void doProcess(final HttpServletRequest request, final HttpServletResponse response) throws IOException { final BeanFactory<Author, Integer> authorFactory = new AuthorFactoryImpl(); Author author = null; if (authorFactory != null) { author = (Author) authorFactory.getMember(5); } I can't pull the Author class. Any help would be greatly appreciated.

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• Simple show/hide jQuery troubles

  - by Banderdash

  Okay, I feel like a bit of a 800 pound gorilla trying to thread a needle when it comes to jQuery. I need a script that will preform a simple show/hide (preferably with a nice sliding in and out) on a list. My markup looks like this: <div id="themes"> <h2>Research Themes</h2> <ul> <li class="tier_1"><a href="">Learn about our approach to the <strong>environment</strong></a> <ul class="tier_2 hide"> <li><a href=""><em>How we are tying this all together</em></a></li> <li><a href=""><strong>Project:</strong> Solor Powered Biofactories</a></li> <li><a href=""><strong>Project:</strong> Cleaning Water with Nature</a></li> <li><a href=""><strong>Project:</strong> Higher Efficiency Solar Technology</a></li> </ul> </li> <li class="tier_1"><a href="">Learn about our approach to <strong>human health</strong></a> <ul class="tier_2 hide"> <li><a href="">Project name numero uno goes here</a></li> <li><a href="">Project name numero dos goes here</a></li> <li><a href="">Project name numero tres goes here</a></li> </ul> </li> <li class="tier_1"><a href="">Learn about our approach to <strong>national defense</strong></a> <ul class="tier_2 hide"> <li><a href="">Project name numero uno goes here</a></li> <li><a href="">Project name numero dos goes here</a></li> <li><a href="">Project name numero tres goes here</a></li> </ul> </li> </ul> </div><!-- // end themes --> You can see that each nested ul has a class of "tier_2" and "hide". Ideally when the li they are nested within ("li.tier_1") is clicked it's child ul will have the hide class removed and the li's contained within will slideout, but at the same time should check all the other ul.tier_2's and be sure they get a hide class--so only one theme can be expanded at a time. I set up a sandbox to try some things: http://jsbin.com/odete/3 My JS looks like this: $(function(){ $(".tier_1 a").each(function(i,o){ $(this).click(function(e){ e.preventDefault(); $(this).addClass("show").siblings("ul").removeClass("show"); $("ul.tier_2:eq("+i+")").show().siblings("ul.tier_2").hide(); }); }); }); Totally a dumb way to do this, I am sure. But I based it off another script and it does work "a little bit" as you can see in the sandbox. If one of you mean hands at jQuery might be so inclined to take a peek I'd be very grateful. If you could also advise on how to have the transitions slideIn and Out that would also be fantastic!

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• Code Golf: Finite-state machine!

  - by Adam Matan

  Finite state machine A deterministic finite state machine is a simple computation model, widely used as an introduction to automata theory in basic CS courses. It is a simple model, equivalent to regular expression, which determines of a certain input string is Accepted or Rejected. Leaving some formalities aside, A run of a finite state machine is composed of: alphabet, a set of characters. states, usually visualized as circles. One of the states must be the start state. Some of the states might be accepting, usually visualized as double circles. transitions, usually visualized as directed arches between states, are directed links between states associated with an alphabet letter. input string, a list of alphabet characters. A run on the machine begins at the starting state. Each letter of the input string is read; If there is a transition between the current state and another state which corresponds to the letter, the current state is changed to the new state. After the last letter was read, if the current state is an accepting state, the input string is accepted. If the last state was not an accepting state, or a letter had no corresponding arch from a state during the run, the input string is rejected. Note: This short descruption is far from being a full, formal definition of a FSM; Wikipedia's fine article is a great introduction to the subject. Example For example, the following machine tells if a binary number, read from left to right, has an even number of 0s: The alphabet is the set {0,1}. The states are S1 and S2. The transitions are (S1, 0) -> S2, (S1, 1) -> S1, (S2, 0) -> S1 and (S2, 1) -> S2. The input string is any binary number, including an empty string. The rules: Implement a FSM in a language of your choice. Input The FSM should accept the following input: <States> List of state, separated by space mark. The first state in the list is the start state. Accepting states begin with a capital letter. <transitions> One or more lines. Each line is a three-tuple: origin state, letter, destination state) <input word> Zero or more characters, followed by a newline. For example, the aforementioned machine with 1001010 as an input string, would be written as: S1 s2 S1 0 s2 S1 1 S1 s2 0 S1 s2 1 s2 1001010 Output The FSM's run, written as <State> <letter> -> <state>, followed by the final state. The output for the example input would be: S1 1 -> S1 S1 0 -> s2 s2 0 -> S1 S1 1 -> S1 S1 0 -> s2 s2 1 -> s2 s2 0 -> S1 ACCEPT For the empty input '': S1 ACCEPT For 101: S1 1 -> S1 S1 0 -> s2 s2 1 -> s2 REJECT For '10X': S1 1 -> S1 S1 0 -> s2 s2 X REJECT Prize A nice bounty will be given to the most elegant and short solution. Reference implementation A reference Python implementation will be published soon.

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• Xcode/iPhone Development 6 months in - Annoyances

  - by clearbrian

  Hi I've been iPhone programming for 6 months and come from a PC/Java/Eclipse background and still have a few annoyances with Xcode/iPhone programming I wonder are there any shortcuts to. Is there any way to prevent multiple windows opening all the time in XCode? a) When you click on the Errors/Warnings in the bottom right of the status bar build errors are shown in separate window. Any way to get these to show in the main editor? b) Anyway to get debugger to appear in main editor. I have a big screen iMac and it's still window hell on Macs. When you come from Alt-Tab the Mac is a nightmare. 2) Anyway to get a toolbar item on the main editor to: a) Open Console (I know CMD-thingy-R) b) Open Break points (you have to open Debugger first then breakpoints) I know there's keyboard shortcuts but I have only left hand free others on the trackball so any keys on right hand side of keyboard are too far. I know you can add Finder toolbar scripts (just wondering if anyway to extend Xcode). Are there utilities to extend Xcode? Scripts/Automator/Any Services I can setup to help. Can you automate Xcode like you can with Windows/ActiveX/VBA 3) Limit lookups using CMD + double click. If I double click on a variable to find its definition using CMD + double click it shows every occurrence of all variables with that name. (annoying it you name all you maps mapView) Anyway to get it to limit to the current class or at least order so current class is first. 4) Find doesn't seem to loop backwards if result all above cursor position I'm in a class and I hit CMD + F for find. Find box appears. I enter some text hit return. It says I have x matches but only back arrow is highlight in Find But when I hit < it does nothing. I need to scroll to the top and redo the search. If the text is both forwards and backwards then both < are highlighted and it works. is this a bug or a 'feature' Missing Eclipse features I have been looking at the User Script menu but was wondering how powerful they are? 5) any scripts around to generate source from members such as description: @property @synthesize if I add a new member, run a script will generate @property/@syntesize and release in dealloc 7) any good sites for scripts? SCM Im having problems with SCM and Folders on HD under project Classes directory. You get a library e.g. JSON. It usually comes as a folder. You copy it to the /Classes for your project. /Classes/JSON I create a Group for the Library in Xcode under Classes group. Classes JSON I drag the files from the folder into xcode into the JSON Group. I add them to the SCM and icon changes from ? to A but if I try and commit them it say folder /JSON is not under SCM. Can you drag a folder into Xcode so that it AND its files get included in SCM? Anyway to stop Xcode Help from being on top all the time. I keep feeling like punching it and telling it to get out of the way! :) I dont mind it open just not in the way once I've finished. Yes I know I can Ctrl-W Sites: the main site I use to learn Obj-C are : stackoverflow.com Google code Search - tonnes of full apps on here http://www.iphonedevsdk.com/forum/iphone-sdk-development/ Apple Developers Forums (anyway to get RSS feed to these or is that blasphemy :) ) Safari - 100s of IT book though prob too many to keep up :) any others? Any site that gives simple examples for Obj-C/ UIKit The docs just show the methods but actual examples (Google code search has helped a lot here)

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• filtering jqgrid based on user input

  - by Rohan

  hi, everything is working fine with my jqgrid except a small issue. i have defined postData below: $(document).ready(function() { $("#ctl00_ContentPlaceHolder2_drpUSite").change(function() { site = ($("#ctl00_ContentPlaceHolder2_drpUSite").val()); loadusergrid(); }); var usrparams = new Object(); var site = ($("#ctl00_ContentPlaceHolder2_drpUSite").val()); //----grid code--------- $("#users").jqGrid({ prmNames: { _search: "isSearch", nd: null, rows: "numRows", page: "page", sort: "sortField", order: "sortOrder" }, // add by default to avoid webmethod parameter conflicts postData: { searchString: '', searchField: '', searchOper: '', sites: site }, datatype: function(postdata) { mtype: "GET", $.ajax({ url: 'Users.aspx/GetUsers', type: "POST", contentType: "application/json; charset=utf-8", data: JSON.stringify(postdata), dataType: "json", success: function(data, st) { if (st == "success") { var grid = $("#users")[0]; var m = JSON.parse(data.d); grid.addJSONData(m); } }, error: function() { alert("Loading Failed!"); } }); }, // this is what jqGrid is looking for in json callback jsonReader: { root: "rows", page: "page", total: "total", records: "records", cell: "cell", id: "login", repeatitems: true }, colNames: ['Login', 'First Name', 'Last Name', 'Email', 'Site', 'Role', 'Room', 'UnitID', 'Supervisor', 'Super'], colModel: [ { name: 'login', index: 'login', width: 20 }, { name: 'fname', index: 'fname', width: 20, hidden: true }, { name: 'lname', index: 'lname', width: 60, align: "center", sortable: true, searchoptions: { sopt: ['eq', 'ne']} }, { name: 'email', index: 'email', width: 20, align: "center", sortable: false }, { name: 'site', index: 'site', width: 50, align: "center", sortable: true, searchoptions: { sopt: ['eq', 'ne']} }, { name: 'role', index: 'role', width: 15, align: "center", sortable: true, searchoptions: { sopt: ['eq', 'ne']} }, { name: 'room', index: 'room', width: 30, align: "center", sortable: true }, { name: 'unitid', index: 'unitid', width: 10, align: "center", sortable: false }, { name: 'super', index: 'super', width: 20 }, { name: 'supername', index: 'supername', width: 10, align: "center", sortable: false }, ], pager: "#pageusers", viewrecords: true, caption: "Registered Users", imgpath: 'themes/steel/images', rowNum: 20, rowList: [10, 20, 30, 40, 50], sortname: "pname", sortorder: "desc", showpage: true, gridModel: true, gridToolbar: true, onSelectRow: function(id) { var ret = jQuery("#users").getRowData(id); accpara.id = ret.id; accpara.pname = ret.pname; accpara.pid = ret.pid; accpara.bld = ret.bld; accpara.cname = ret.cname; accpara.amt = ret.amt; accpara.status = ret.status; accpara.notes = ret.notes; accpara.lname = ret.lname; } }); jQuery("#users").navGrid('#pageusers', { view: false, del: false, add: false, edit: false }, {}, // default settings for edit {}, // default settings for add {}, // delete {closeOnEscape: true, multipleSearch: true, closeAfterSearch: true }, // search options {} ); $("#users").setGridWidth(1300, true); $("#users").setGridHeight(500, true); jQuery("#users").jqGrid('filterToolbar'); //----grid code ends here function loadusergrid() { $("#users").setGridParam({ page: 1 }, { pgbuttons: true }, { pginput: true }, { postData: { "site": site} }).trigger("reloadGrid"); } }); when page loads for the 1st time, this works.. now i have 4 drop-downs which filter users. i have written a function which reloads the grid when the dropdown is changed, but it isnt working.. what am i doing wrong here?? when i enable postback for the dropdowns, i get the filtered result. i want to avoid postbacks on my page :). right now i have added just the site dropdown as the filter. once this starts working ill add the remaining 3. firebug shows the ajax call is fired successfully but with an empty sitename. please note that the site dropdown cntains an empty value when page is loaded for the 1st time. thanks in advance

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• ie7 innerhtml strange display problem

  - by thoraniann

  Hello, I am having a strange problem with ie7 (ie8 in compatibility mode). I have div containers where I am updating values using javascript innhtml to update the values. This works fine in Firefox and ie8. In ie7 the values do not update but if a click on the values and highlight them then they update, also if a change the height of the browser then on the next update the values get updated correctly. I have figured out that if I change the position property of the outer div container from relative to static then the updates work correctly. The page can be viewed here http://islendingasogur.net/test/webmap_html_test.html In internet explorer 8 with compatibility turned on you can see that the timestamp in the gray box only gets updated one time, after that you see no changes. The timestamp in the lower right corner gets updated every 10 seconds. But if you highlight the text in the gray box then the updated timestamp values appears! Here is the page: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <meta http-equiv="cache-control" content="no-cache"/> <meta http-equiv="pragma" content="no-cache"/> <meta http-equiv="expires" content="Mon, 22 Jul 2002 11:12:01 GMT"/> <title>innerhtml problem</title> <script type="text/javascript"> <!-- var alarm_off_color = '#00ff00'; var alarm_low_color = '#ffff00'; var alarm_lowlow_color = '#ff0000'; var group_id_array = new Array(); var var_alarm_array = new Array(); var timestamp_color = '#F3F3F3'; var timestamp_alarm_color = '#ff00ff'; group_id_array[257] = 0; function updateParent(var_array, group_array) { //Update last update time var time_str = "Last Reload Time: "; var currentTime = new Date(); var hours = currentTime.getHours(); var minutes = currentTime.getMinutes(); var seconds = currentTime.getSeconds(); if(minutes < 10) {minutes = "0" + minutes;} if(seconds < 10) {seconds = "0" + seconds;} time_str += hours + ":" + minutes + ":" + seconds; document.getElementById('div_last_update_time').innerHTML = time_str; //alert(time_str); alarm_var = 0; //update group values for(i1 = 0; i1 < var_array.length; ++i1) { if(document.getElementById(var_array[i1][0])) { document.getElementById(var_array[i1][0]).innerHTML = unescape(var_array[i1][1]); if(var_array[i1][2]==0) {document.getElementById(var_array[i1][0]).style.backgroundColor=alarm_off_color} else if(var_array[i1][2]==1) {document.getElementById(var_array[i1][0]).style.backgroundColor=alarm_low_color} else if(var_array[i1][2]==2) {document.getElementById(var_array[i1][0]).style.backgroundColor=alarm_lowlow_color} //check if alarm is new var_id = var_array[i1][3]; if(var_array[i1][2]==1 && var_array[i1][4]==0) { alarm_var = 1; } else if(var_array[i1][2]==2 && var_array[i1][4]==0) { alarm_var = 1; } } } //Update group timestamp and box alarm color for(i1 = 0; i1 < group_array.length; ++i1) { if(document.getElementById(group_array[i1][0])) { //set timestamp for group document.getElementById(group_array[i1][0]).innerHTML = group_array[i1][1]; if(group_array[i1][4] != -1) { //set data update error status current_timestamp_color = timestamp_color; if(group_array[i1][4] == 1) {current_timestamp_color = timestamp_alarm_color;} document.getElementById(group_array[i1][0]).style.backgroundColor = current_timestamp_color; } } } } function update_map(map_id) { document.getElementById('webmap_update').src = 'webmap_html_test_sub.html?first_time=1&map_id='+map_id; } --> </script> <style type="text/css"> body { margin:0; border:0; padding:0px;background:#eaeaea;font-family:verdana, arial, sans-serif; text-align: center; } A:active { color: #000000;} A:link { color: #000000;} A:visited { color: #000000;} A:hover { color: #000000;} #div_header { /*position: absolute;*/ background: #ffffff; width: 884px; height: 60px; display: block; float: left; font-size: 14px; text-align: left; /*overflow: visible;*/ } #div_container{ background: #ffffff;border-left:1px solid #000000; border-right:1px solid #000000; border-bottom:1px solid #000000; float: left; width: 884px;} #div_image_container{ position: relative; width: 884px; height: 549px; background: #ffffff; font-family:arial, verdana, arial, sans-serif; /*display: block;*/ float:none!important; float/**/:left; border:1px solid #00ff00; padding: 0px; } .div_group_box{ position: absolute; width: -2px; height: -2px; background: #FFFFFF; opacity: 1; filter: alpha(opacity=100); border:1px solid #000000; font-size: 2px; z-index: 0; padding: 0px; } .div_group_container{ position: absolute; opacity: 1; filter: alpha(opacity=100); z-index: 5; /*display: block;*/ /*border:1px solid #000000;*/ } .div_group_container A:active {text-decoration: none; display: block;} .div_group_container A:link { color: #000000;text-decoration: none; display: block;} .div_group_container A:visited { color: #000000;text-decoration: none; display: block;} .div_group_container A:hover { color: #000000;text-decoration: none; display: block;} .div_group_header{ background: #17B400; border:1px solid #000000;font-size: 12px; color: #FFFFFF; padding-top: 1px; padding-bottom: 1px; padding-left: 2px; padding-right: 2px; text-align: center; } .div_var_name_container{ color: #000000;background: #FFFFFF; border-left:1px solid #000000; border-top:0px solid #000000; border-bottom:0px solid #000000;font-size: 12px; float: left; display: block; text-align: left; } .div_var_name{ padding-top: 1px; padding-bottom: 1px; padding-left: 2px; padding-right: 2px; display: block; } .div_var_value_container{ color: #000000;background: #FFFFFF; border-left:1px solid #000000; border-right:1px solid #000000; border-top:0px solid #000000; border-bottom:0px solid #000000;font-size: 12px; float: left; text-align: center; } .div_var_value{ padding-top: 1px; padding-bottom: 1px; padding-left: 2px; padding-right: 2px; } .div_var_unit_container{ color: #000000;background: #FFFFFF; border-right:1px solid #000000; border-top:0px solid #000000; border-bottom:0px solid #000000;font-size: 12px; float: left; text-align: left; } .div_var_unit{ padding-top: 1px; padding-bottom: 1px; padding-left: 2px; padding-right: 2px; } .div_timestamp{ float: none; color: #000000;background: #F3F3F3; border:1px solid #000000;font-size: 12px; padding-top: 1px; padding-bottom: 1px; padding-left: 2px; padding-right: 2px; text-align: center; clear: left; z-index: 100; position: relative; } #div_last_update_time{ height: 14px; width: 210px; text-align: right; padding: 1px; font-size: 10px; float: right; } .copyright{ height: 14px; width: 240px; text-align: left; color: #777; padding: 1px; font-size: 10px; float: left; } a img { border: 1px solid #000000; } .clearer { clear: both; display: block; height: 1px; margin-bottom: -1px; font-size: 1px; line-height: 1px; } </style> </head> <body onload="update_map(1)"> <div id="div_container"><div id="div_header"></div><div class="clearer"></div><div id="div_image_container"><img id="map" src="Images/maps/0054_gardabaer.jpg" title="My map" alt="" align="left" border="0" usemap ="#_area_links" style="padding: 0px; margin: 0px;" /> <div id="group_container_257" class="div_group_container" style="visibility:visible; top:10px; left:260px; cursor: pointer;"> <div class="div_group_header" style="clear:right">Site</div> <div class="div_var_name_container"> <div id="group_name_257_var_8" class="div_var_name" >variable 1</div> <div id="group_name_257_var_7" class="div_var_name" style="border-top:1px solid #000000;">variable 2</div> <div id="group_name_257_var_9" class="div_var_name" style="border-top:1px solid #000000;">variable 3</div> </div> <div class="div_var_value_container"> <div id="group_value_257_var_8" class="div_var_value" >0</div> <div id="group_value_257_var_7" class="div_var_value" style="border-top:1px solid #000000;">0</div> <div id="group_value_257_var_9" class="div_var_value" style="border-top:1px solid #000000;">0</div> </div> <div class="div_var_unit_container"> <div id="group_unit_257_var_8" class="div_var_unit" >N/A</div> <div id="group_unit_257_var_7" class="div_var_unit" style="border-top:1px solid #000000;">N/A</div> <div id="group_unit_257_var_9" class="div_var_unit" style="border-top:1px solid #000000;">N/A</div> </div> <div id="group_257_timestamp" class="div_timestamp" style="">-</div> </div> </div><div class="clearer"></div><div class="copyright">© Copyright</div><div id="div_last_update_time">-</div> </div> <iframe id="webmap_update" style="display:none;" width="0" height="0"></iframe></body> </html> The divs with class div_var_value, div_timestamp & div_last_update_time all get updated by the javascript function. The div "div_image_container" is the one that is causing this it seems, atleast if I change the position property for it from relative to static the values get updated correctly This is the page that updates the values: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Loader</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <script type="text/javascript"> <!-- window.onload = doLoad; function refresh() { //window.location.reload( false ); var _random_num = Math.floor(Math.random()*1100); window.location.search="?map_id=54&first_time=0&t="+_random_num; } var var_array = new Array(); var timestamp_array = new Array(); var_array[0] = Array('group_value_257_var_9','41.73',-1, 9, 0); var_array[1] = Array('group_value_257_var_7','62.48',-1, 7, 0); var_array[2] = Array('group_value_257_var_8','4.24',-1, 8, 0); var current_time = new Date(); var current_time_str = current_time.getHours(); current_time_str += ':'+current_time.getMinutes(); current_time_str += ':'+current_time.getSeconds(); timestamp_array[0] = Array('group_257_timestamp',current_time_str,'box_group_container_206',-1, -1); //timestamp_array[0] = Array('group_257_timestamp','11:33:16 23.Nov','box_group_container_257',-1, -1); window.parent.updateParent(var_array, timestamp_array); function doLoad() { setTimeout( "refresh()", 10*1000 ); } //--> </script> </head> <body> </body> </html> I edited the post and added a link to the webpage in question, I have also tested the webpage in internet explorer 7 and this error does not appear there. I have only seen this error in ie8 with compatibility turned on. If anybody has seen this before and has a fix, I would be very grateful. Thanks.

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• Flex SDK missing fundamental things

  - by Bart van Heukelom

  All of a sudden Flash Builder 4 is missing all kinds of fundamental things and is generating incorrect errors. I've had the same issue yesterday, where I fixed it by downloading a new Flex SDK and importing that into FB. I did this again, but this time it fixed nothing. I don't think it's something I did, like removing critical references from the build path. The errors also appeared on projects I was not working on at the time. It occurs for ActionScript, Flex and Flex Library projects alike. Update 3: Well, i've singled the problem down to a single piece of code, though a very simple one. I can make a new workspace in FB and things work ok, then screw the workspace up forever by adding this code to a project. All projects will have errors and closing or even removing the faulty project does not change this. Making another new workspace (without the faulty code) makes my projects compile again. Link: http://www.the3rdage.net/files/2745/Main.as (i've uploaded the file in case an odd character or encoding error causes the error) Update 2: I've tried manual compiling with mxmlc, the same errors occur. It appears to be an SDK problem, not Flash Builder. Update: I find this stack trace in the Flash Builder error log: !ENTRY com.adobe.flexbuilder.project 4 43 2010-05-11 11:55:47.495 !MESSAGE Uncaught exception in compiler !STACK 0 java.lang.NullPointerException at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2592) at macromedia.asc.parser.VariableBindingNode.evaluate(VariableBindingNode.java:64) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2233) at macromedia.asc.parser.ListNode.evaluate(ListNode.java:44) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2578) at macromedia.asc.parser.VariableDefinitionNode.evaluate(VariableDefinitionNode.java:48) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2310) at macromedia.asc.parser.StatementListNode.evaluate(StatementListNode.java:60) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2503) at macromedia.asc.parser.WithStatementNode.evaluate(WithStatementNode.java:44) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2310) at macromedia.asc.parser.StatementListNode.evaluate(StatementListNode.java:60) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2891) at macromedia.asc.parser.FunctionCommonNode.evaluate(FunctionCommonNode.java:106) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:2905) at macromedia.asc.parser.FunctionCommonNode.evaluate(FunctionCommonNode.java:106) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:3643) at macromedia.asc.parser.ClassDefinitionNode.evaluate(ClassDefinitionNode.java:106) at macromedia.asc.semantics.ConstantEvaluator.evaluate(ConstantEvaluator.java:3371) at macromedia.asc.parser.ProgramNode.evaluate(ProgramNode.java:80) at flex2.compiler.as3.As3Compiler.analyze4(As3Compiler.java:709) at flex2.compiler.CompilerAPI.analyze(CompilerAPI.java:3089) at flex2.compiler.CompilerAPI.analyze(CompilerAPI.java:2977) at flex2.compiler.CompilerAPI.batch2(CompilerAPI.java:528) at flex2.compiler.CompilerAPI.batch(CompilerAPI.java:1274) at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1496) at flex2.tools.oem.Application.compile(Application.java:1188) at flex2.tools.oem.Application.recompile(Application.java:1133) at flex2.tools.oem.Application.compile(Application.java:819) at flex2.tools.flexbuilder.BuilderApplication.compile(BuilderApplication.java:344) at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder$MyBuilder.mybuild(ASApplicationBuilder.java:276) at com.adobe.flexbuilder.multisdk.compiler.internal.ASApplicationBuilder.build(ASApplicationBuilder.java:127) at com.adobe.flexbuilder.multisdk.compiler.internal.ASBuilder.build(ASBuilder.java:190) at com.adobe.flexbuilder.multisdk.compiler.internal.ASItemBuilder.build(ASItemBuilder.java:74) at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.buildItem(FlexProjectBuilder.java:480) at com.adobe.flexbuilder.project.compiler.internal.FlexProjectBuilder.build(FlexProjectBuilder.java:306) at com.adobe.flexbuilder.project.compiler.internal.FlexIncrementalBuilder.build(FlexIncrementalBuilder.java:157) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256) at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341) at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140) at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

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• Improving the performance of XSL

  - by Rachel

  In the below XSL for the variable "insert-data", I have an input param with the structure, <insert-data> <data compareIndex="4" nodeName="d1e1"> <a/> </data> <data compareIndex="5" nodeName="d1e1"> <b/> </data> <data compareIndex="7" nodeName="d1e2"> <a/> </data> <data compareIndex="9" nodeName="d1e2"> <b/> </data> </insert-data> where "nodeName" is the id of a node and "compareIndex" is the position of the text content relative to the node having id "$nodeName". I am using the below XSL to select all the text nodes(generate-id) that satisfy the above condition and construct a data xml. The below implementation works perfectly but the time taken for the execution is in min. Is there a better way of implementing or is there any in-efficient operation being used. From my observation the code where the preceding text length is calculated consumes the major time. Please share your thoughts to improve the performance of the XSL. I am using Java SAXON XSL transformer. <xsl:variable name="insert-data" as="element()*"> <xsl:for-each select="$insert-file/insert-data/data"> <xsl:sort select="xsd:integer(@index)"/> <xsl:variable name="compareIndex" select="xsd:integer(@compareIndex)" /> <xsl:variable name="nodeName" select="@nodeName" /> <xsl:variable name="nodeContent" as="node()"> <xsl:copy-of select="node()"/> </xsl:variable> <xsl:for-each select="$main-root/*//text()[ancestor::*[@id = $nodeName]]"> <xsl:variable name="preTextLength" as="xsd:integer" select="sum((preceding::text())[. ancestor::*[@id = $nodeName]]/string-length(.))" /> <xsl:variable name="currentTextLength" as="xsd:integer" select="string-length(.)" /> <xsl:variable name="sum" select="$preTextLength + $currentTextLength" as="xsd:integer"></xsl:variable> <xsl:variable name="split-index" select="$compareIndex - $preTextLength" as="xsd:integer"></xsl:variable> <xsl:if test="($sum ge $compareIndex) and ($compareIndex gt $preTextLength)"> <data split-index="{$split-index}" text-id="{generate-id(.)}"> <xsl:copy-of select="$nodeContent"/> </data> </xsl:if> </xsl:for-each> </xsl:for-each> </xsl:variable>

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• Django ImageField issue with JPEG's

  - by Kieran Lynn

  I am having a major issue with PIL (Python Image Library) in Django and have jumpped through a lot of hoops and have thus far not been able to figure out what the root of the issue is. The problem essentially breaks down to not being able to upload JPEG images through the ImageField in the Django admin. But the issue is not as simple as installing libjpeg. First, I installed PIL (through Buildout) and realized once it was installed that I had not installed libjpeg because JPEG support was not available. Having not setup the server myself, I just assumed that it was not installed and I compiled libjpeg 8 from the source. This ended up in my /usr/local/lib/ directory. I cleared out my Buildout files and rebuilt everything. This time when PIL compiled I had JPEG support. But I went to the Django Admin and tried to upload a JPEG though an ImageField with no luck. I got the "Upload a valid image. The file you uploaded was either not an image or a corrupted image" error. Just as a test I opened up a the Djano shell and ran the following: > import Image > i = Image.open( "/absolute_path/file.jpg" ) > print i <JpegImagePlugin.JpegImageFile image mode=RGB size=940x375 at 0x7F908C529BD8> This runs with no errors and shows that PIL is able to open JPEG's. After doing some reading, I come across this thread: Is it possible to control which libraries apache uses? Looks like PHP also uses libjpeg and is loading before Django, and therefor loading libjpeg 6.2 before. This is show when using lsof: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME apache2 2561 www-data mem REG 202,1 146032 639276 /usr/lib/libjpeg.so.62.0.0 So my thought is that I should be using libjpeg 6.2. So I removed libjpeg located in my /usr/local/lib directory. After rereading the PIL installation instructions, I realized that I might not have the dev/header files for libjpeg that PIL needs. So I also uninstalled libjpeg using the aptitude uninstaller (sudo aptitude remove libjpeg62). Then to ensure that I got the header files that PIL needed I installed libjpeg using aptitude: (sudo aptget install libjpeg62-dev). From here I cleaned out my Buildout directory, and reran Buildout, which in turn reinstalled PIL. Once again, I have JPEG support, now using the libjpeg62. So I go to test in the Django Admin. Still no JPEG support. So I wanted to test JPEG support in general and see if the exception was not handled, what kind of error it would throw. So in my homepage view I added the following code to open a JPEG image: import Image i = Image.open( "/absolute_path/file.jpg" ) v = i.verify() Then I pass i to the HTML view just to easily see the output. I deploy these changes to the server and restart. I am surprised not to see an error and get the following output: {{ i }} - <JpegImagePlugin.JpegImageFile image mode=RGB size=940x375 at 0x7F908C529BD8> {{ v }} - None So at this point I am really confused: Why can I successfully open a JPEG while the admin cannot? Am I missing something, is this not an issue with libjpeg? If not an issue with libjpeg, why can I upload a PNG with no issues? Any help would be much appreciated, I have been on this for 2 days debugging with no luck. Setup: 1. Rackspace Cloud Server 2. Ubuntu 10.04 3. Django 1.2.3 (Installed though Buildout) 4. PIL 1.1.7 (Installed though Buildout) 5. libjpeg 6.2 (installed through aptitude (sudo aptget install libjpeg62-dev)

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• Preventing multiple repeat selection of synchronized Controls ?

  - by BillW

  The working code sample here synchronizes (single) selection in a TreeView, ListView, and ComboBox via the use of lambda expressions in a dictionary where the Key in the dictionary is a Control, and the Value of each Key is an Action<int. Where I am stuck is that I am getting multiple repetitions of execution of the code that sets the selection in the various controls in a way that's unexpected : it's not recursing : there's no StackOverFlow error happening; but, I would like to figure out why the current strategy for preventing multiple selection of the same controls is not working. Perhaps the real problem here is distinguishing between a selection update triggered by the end-user and a selection update triggered by the code that synchronizes the other controls ? Note: I've been experimenting with using Delegates, and forms of Delegates like Action<T>, to insert executable code in Dictionaries : I "learn best" by posing programming "challenges" to myself, and implementing them, as well as studying, at the same time, the "golden words" of luminaries like Skeet, McDonald, Liberty, Troelsen, Sells, Richter. Note: Appended to this question/code, for "deep background," is a statement of how I used to do things in pre C#3.0 days where it seemed like I did need to use explicit measures to prevent recursion when synchronizing selection. Code : Assume a WinForms standard TreeView, ListView, ComboBox, all with the same identical set of entries (i.e., the TreeView has only root nodes; the ListView, in Details View, has one Column). private Dictionary<Control, Action<int>> ControlToAction = new Dictionary<Control, Action<int>>(); private void Form1_Load(object sender, EventArgs e) { // add the Controls to be synchronized to the Dictionary // with appropriate Action<int> lambda expressions ControlToAction.Add(treeView1, (i => { treeView1.SelectedNode = treeView1.Nodes[i]; })); ControlToAction.Add(listView1, (i => { listView1.Items[i].Selected = true; })); ControlToAction.Add(comboBox1, (i => { comboBox1.SelectedIndex = i; })); } private void synchronizeSelection(int i, Control currentControl) { foreach(Control theControl in ControlToAction.Keys) { // skip the 'current control' if (theControl == currentControl) continue; // for debugging only Console.WriteLine(theControl.Name + " synchronized"); // execute the Action<int> associated with the Control ControlToAction[theControl](i); } } private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { synchronizeSelection(e.Node.Index, treeView1); } private void listView1_SelectedIndexChanged(object sender, EventArgs e) { // weed out ListView SelectedIndexChanged firing // with SelectedIndices having a Count of #0 if (listView1.SelectedIndices.Count > 0) { synchronizeSelection(listView1.SelectedIndices[0], listView1); } } private void comboBox1_SelectedValueChanged(object sender, EventArgs e) { if (comboBox1.SelectedIndex > -1) { synchronizeSelection(comboBox1.SelectedIndex, comboBox1); } } background : pre C# 3.0 Seems like, back in pre C# 3.0 days, I was always using a boolean flag to prevent recursion when multiple controls were updated. For example, I'd typically have code like this for synchronizing a TreeView and ListView : assuming each Item in the ListView was synchronized with a root-level node of the TreeView via a common index : // assume ListView is in 'Details View,' has a single column, // MultiSelect = false // FullRowSelect = true // HideSelection = false; // assume TreeView // HideSelection = false // FullRowSelect = true // form scoped variable private bool dontRecurse = false; private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { if(dontRecurse) return; dontRecurse = true; listView1.Items[e.Node.Index].Selected = true; dontRecurse = false; } private void listView1_SelectedIndexChanged(object sender, EventArgs e) { if(dontRecurse) return // weed out ListView SelectedIndexChanged firing // with SelectedIndices having a Count of #0 if (listView1.SelectedIndices.Count > 0) { dontRecurse = true; treeView1.SelectedNode = treeView1.Nodes[listView1.SelectedIndices[0]]; dontRecurse = false; } } Then it seems, somewhere around FrameWork 3~3.5, I could get rid of the code to suppress recursion, and there was was no recursion (at least not when synchronizing a TreeView and a ListView). By that time it had become a "habit" to use a boolean flag to prevent recursion, and that may have had to do with using a certain third party control.

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• Using UUIDs for cheap equals() and hashCode()

  - by Tom McIntyre

  I have an immutable class, TokenList, which consists of a list of Token objects, which are also immutable: @Immutable public final class TokenList { private final List<Token> tokens; public TokenList(List<Token> tokens) { this.tokens = Collections.unmodifiableList(new ArrayList(tokens)); } public List<Token> getTokens() { return tokens; } } I do several operations on these TokenLists that take multiple TokenLists as inputs and return a single TokenList as the output. There can be arbitrarily many TokenLists going in, and each can have arbitrarily many Tokens. These operations are expensive, and there is a good chance that the same operation (ie the same inputs) will be performed multiple times, so I would like to cache the outputs. However, performance is critical, and I am worried about the expense of performing hashCode() and equals() on these objects that may contain arbitrarily many elements (as they are immutable then hashCode could be cached, but equals will still be expensive). This led me to wondering whether I could use a UUID to provide equals() and hashCode() simply and cheaply by making the following updates to TokenList: @Immutable public final class TokenList { private final List<Token> tokens; private final UUID uuid; public TokenList(List<Token> tokens) { this.tokens = Collections.unmodifiableList(new ArrayList(tokens)); this.uuid = UUID.randomUUID(); } public List<Token> getTokens() { return tokens; } public UUID getUuid() { return uuid; } } And something like this to act as a cache key: @Immutable public final class TopicListCacheKey { private final UUID[] uuids; public TopicListCacheKey(TopicList... topicLists) { uuids = new UUID[topicLists.length]; for (int i = 0; i < uuids.length; i++) { uuids[i] = topicLists[i].getUuid(); } } @Override public int hashCode() { return Arrays.hashCode(uuids); } @Override public boolean equals(Object other) { if (other == this) return true; if (other instanceof TopicListCacheKey) return Arrays.equals(uuids, ((TopicListCacheKey) other).uuids); return false; } } I figure that there are 2^128 different UUIDs and I will probably have at most around 1,000,000 TokenList objects active in the application at any time. Given this, and the fact that the UUIDs are used combinatorially in cache keys, it seems that the chances of this producing the wrong result are vanishingly small. Nevertheless, I feel uneasy about going ahead with it as it just feels 'dirty'. Are there any reasons I should not use this system? Will the performance costs of the SecureRandom used by UUID.randomUUID() outweigh the gains (especially since I expect multiple threads to be doing this at the same time)? Are collisions going to be more likely than I think? Basically, is there anything wrong with doing it this way?? Thanks.

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