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• Why Look and feel is not getting updated properly?

  - by swift

  I’m developing a swing application in which I have an option to change the Look and feel of the application on click of a button. Now my problem is when I click the button to change the theme it’s not properly updating the L&F of my app, say my previous theme is “noire” and I choose “MCWin” after it, but the style of the noire theme is still there Here is sample working code: package whiteboard; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ComponentEvent; import java.awt.event.ComponentListener; import javax.swing.JFrame; import javax.swing.JLayeredPane; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.WindowConstants; public class DiscussionBoard extends JFrame implements ComponentListener,ActionListener { // Variables declaration private JMenuItem audioMenuItem; private JMenuItem boardMenuItem; private JMenuItem exitMenuItem; private JMenuItem clientsMenuItem; private JMenuItem acryl; private JMenuItem hifi; private JMenuItem aero; private JMenuItem aluminium; private JMenuItem bernstein; private JMenuItem fast; private JMenuItem graphite; private JMenuItem luna; private JMenuItem mcwin; private JMenuItem noire; private JMenuItem smart; private JMenuBar boardMenuBar; private JMenuItem messengerMenuItem; private JMenu openMenu; private JMenu saveMenu; private JMenu themesMenu; private JMenuItem saveMessengerMenuItem; private JMenuItem saveWhiteboardMenuItem; private JMenu userMenu; JLayeredPane layerpane; /** Creates new form discussionBoard * @param connection */ public DiscussionBoard() { initComponents(); setLocationRelativeTo(null); addComponentListener(this); } private void initComponents() { boardMenuBar = new JMenuBar(); openMenu = new JMenu(); themesMenu = new JMenu(); messengerMenuItem = new JMenuItem(); boardMenuItem = new JMenuItem(); audioMenuItem = new JMenuItem(); saveMenu = new JMenu(); saveMessengerMenuItem = new JMenuItem(); saveWhiteboardMenuItem = new JMenuItem(); userMenu = new JMenu(); clientsMenuItem = new JMenuItem(); exitMenuItem = new JMenuItem(); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setLayout(new GridBagLayout()); setResizable(false); setTitle("Discussion Board"); openMenu.setText("Open"); saveMenu.setText("Save"); themesMenu.setText("Themes"); acryl = new JMenuItem("Acryl"); hifi = new JMenuItem("HiFi"); aero = new JMenuItem("Aero"); aluminium = new JMenuItem("Aluminium"); bernstein = new JMenuItem("Bernstein"); fast = new JMenuItem("Fast"); graphite = new JMenuItem("Graphite"); luna = new JMenuItem("Luna"); mcwin = new JMenuItem("MCwin"); noire = new JMenuItem("Noire"); smart = new JMenuItem("Smart"); hifi.addActionListener(this); acryl.addActionListener(this); aero.addActionListener(this); aluminium.addActionListener(this); bernstein.addActionListener(this); fast.addActionListener(this); graphite.addActionListener(this); luna.addActionListener(this); mcwin.addActionListener(this); noire.addActionListener(this); smart.addActionListener(this); messengerMenuItem.setText("Messenger"); openMenu.add(messengerMenuItem); openMenu.add(boardMenuItem); audioMenuItem.setText("Audio Messenger"); openMenu.add(audioMenuItem); exitMenuItem.setText("Exit"); exitMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { exitMenuItemActionPerformed(evt); } }); openMenu.add(exitMenuItem); boardMenuBar.add(openMenu); saveMessengerMenuItem.setText("Messenger"); saveMenu.add(saveMessengerMenuItem); saveWhiteboardMenuItem.setText("Whiteboard"); saveMenu.add(saveWhiteboardMenuItem); boardMenuBar.add(saveMenu); userMenu.setText("Users"); clientsMenuItem.setText("Current Session"); userMenu.add(clientsMenuItem); themesMenu.add(acryl); themesMenu.add(hifi); themesMenu.add(aero); themesMenu.add(aluminium); themesMenu.add(bernstein); themesMenu.add(fast); themesMenu.add(graphite); themesMenu.add(luna); themesMenu.add(mcwin); themesMenu.add(noire); themesMenu.add(smart); boardMenuBar.add(userMenu); boardMenuBar.add(themesMenu); saveMessengerMenuItem.setEnabled(false); saveWhiteboardMenuItem.setEnabled(false); setJMenuBar(boardMenuBar); setSize(1024, 740); setVisible(true); } protected void exitMenuItemActionPerformed(ActionEvent evt) { System.exit(0); } @Override public void componentHidden(ComponentEvent arg0) { } @Override public void componentMoved(ComponentEvent e) { } @Override public void componentResized(ComponentEvent arg0) { } @Override public void componentShown(ComponentEvent arg0) { } @Override public void actionPerformed(ActionEvent e) { try { if(e.getSource()==hifi) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.hifi.HiFiLookAndFeel"); enableTheme(); hifi.setEnabled(false); } else if(e.getSource()==acryl) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel"); enableTheme(); acryl.setEnabled(false); } else if(e.getSource()==aero) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.aero.AeroLookAndFeel"); enableTheme(); aero.setEnabled(false); } else if(e.getSource()==aluminium) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.aluminium.AluminiumLookAndFeel"); enableTheme(); aluminium.setEnabled(false); } else if(e.getSource()==bernstein) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.bernstein.BernsteinLookAndFeel"); enableTheme(); bernstein.setEnabled(false); } else if(e.getSource()==fast) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.fast.FastLookAndFeel"); enableTheme(); fast.setEnabled(false); } else if(e.getSource()==graphite) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.graphite.GraphiteLookAndFeel"); enableTheme(); graphite.setEnabled(false); } else if(e.getSource()==luna) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.luna.LunaLookAndFeel"); enableTheme(); luna.setEnabled(false); } else if(e.getSource()==mcwin) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.mcwin.McWinLookAndFeel"); enableTheme(); mcwin.setEnabled(false); } else if(e.getSource()==noire) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.noire.NoireLookAndFeel"); enableTheme(); noire.setEnabled(false); } else if(e.getSource()==smart) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.smart.SmartLookAndFeel"); enableTheme(); smart.setEnabled(false); } SwingUtilities.updateComponentTreeUI(getRootPane()); } catch (Exception ex) { ex.printStackTrace(); } } private void enableTheme() { acryl.setEnabled(true); hifi.setEnabled(true); aero.setEnabled(true); aluminium.setEnabled(true); bernstein.setEnabled(true); fast.setEnabled(true); graphite.setEnabled(true); luna.setEnabled(true); mcwin.setEnabled(true); noire.setEnabled(true); smart.setEnabled(true); } public static void main(String []ar) { try { UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel"); } catch (Exception e) { e.printStackTrace(); } new DiscussionBoard(); } } What’s the problem here? why its not getting updated? There is a demo application here which is exactly doing what i want but i cant get a clear idea of it.

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• Any good tools or tips for fuzz testing Windows forms applications?

  - by Ogre Psalm33

  I'm maintaining a ~300K LOC C# legacy thick-client application with a Windows.Forms interface. The app is full of little bugs and quirks. For example, I recently discovered a bug where if a users edits and tabs (not clicks) through cells on a DataViewGrid, and leaves the a certain cell selected, the app gets an "Object reference not set to an instance of an object" exception. I discover (or get a bug report of) something new like this about every week or two. I've had enough, and was thinking of trying some sort of fuzz testing on the application to try to ferret out undiscovered issues. If I roll-my-own fuzz testing, I'd assume I at least need to be able to generate test harnesses that run pieces of my app (main window, FormX, FormY, FormZ, ...) independently and try to inject events into them. I was trying to look for tools suited for this, but so far have come up with nothing for Win Forms. (There seems to be no shortage of fuzz testing tools for web apps, however). Any helpful ideas?

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• Maximum page fetch with maximum bandwith

  - by Ehsan

  Hi I want to create an application like a spider I've implement fetching page as the following code in multi-thread application but there is two problem 1) I want to use my maximum bandwidth to send/receive request, how should I config my request to do so (Like Download Accelerator application and the like) cause I heard the normal application will use 66% of the available bandwidth. 2) I don't know what exactly HttpWebRequest.KeepAlive do, but as its name implies I think i can create a connection to a website and without closing the connection sending another request to that web site using existing connection. does it boost performance or Im wrong ?? public PageFetchResult Fetch() { PageFetchResult fetchResult = new PageFetchResult(); try { HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(URLAddress); HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); Uri requestedURI = new Uri(URLAddress); Uri responseURI = resp.ResponseUri; string resultHTML = ""; byte[] reqHTML = ResponseAsBytes(resp); if (!string.IsNullOrEmpty(FetchingEncoding)) resultHTML = Encoding.GetEncoding(FetchingEncoding).GetString(reqHTML); else if (!string.IsNullOrEmpty(resp.CharacterSet)) resultHTML = Encoding.GetEncoding(resp.CharacterSet).GetString(reqHTML); req.Abort(); resp.Close(); fetchResult.IsOK = true; fetchResult.ResultHTML = resultHTML; } catch (Exception ex) { fetchResult.IsOK = false; fetchResult.ErrorMessage = ex.Message; } return fetchResult; }

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• Passing JSON object from Controller to View(jsp)

  - by user752233

  I am trying to send JSON object to my view from controller but unable to send it. Please help me out! I am using following code public class SystemController extends AbstractController{ protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView mav = new ModelAndView("SystemInfo", "System", "S"); response.setContentType("application/json;charset=UTF-8"); response.setHeader("Cache-Control", "no-cache"); JSONObject jsonResult = new JSONObject(); jsonResult.put("JVMVendor", System.getProperty("java.vendor")); jsonResult.put("JVMVersion", System.getProperty("java.version")); jsonResult.put("JVMVendorURL", System.getProperty("java.vendor.url")); jsonResult.put("OSName", System.getProperty("os.name")); jsonResult.put("OSVersion", System.getProperty("os.version")); jsonResult.put("OSArchitectire", System.getProperty("os.arch")); response.getWriter().write(jsonResult.toString()); // response.getWriter().close(); return mav; // return modelandview object } } and in the view side I am using <script type="text/javascript"> Ext.onReady(function(response) { //Ext.MessageBox.alert('Hello', 'The DOM is ready!'); var showExistingScreen = function () { Ext.Ajax.request({ url : 'system.htm', method : 'POST', scope : this, success: function ( response ) { alert('1'); var existingValues = Ext.util.JSON.decode(response.responseText); alert('2'); } }); }; return showExistingScreen(); });

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• NullReferenceException when initializing NServiceBus within web application Application_Start method

  - by SteveBering

  I am running the 2.0 RTM of NServiceBus and am getting a NullReferenceException when my MessageModule binds the CurrentSessionContext to my NHibernate sessionfactory. From within my Application_Start, I call the following method: public static void WithWeb(IUnityContainer container) { log4net.Config.XmlConfigurator.Configure(); var childContainer = container.CreateChildContainer(); childContainer.RegisterInstance<ISessionFactory>(NHibernateSession.SessionFactory); var bus = NServiceBus.Configure.WithWeb() .UnityBuilder(childContainer) .Log4Net() .XmlSerializer() .MsmqTransport() .IsTransactional(true) .PurgeOnStartup(false) .UnicastBus() .ImpersonateSender(false) .LoadMessageHandlers() .CreateBus(); var activeBus = bus.Start(); container.RegisterInstance(typeof(IBus), activeBus); } When the bus is started, my message module starts with the following: public void HandleBeginMessage() { try { CurrentSessionContext.Bind(_sessionFactory.OpenSession()); } catch (Exception e) { _log.Error("Error occurred in HandleBeginMessage of NHibernateMessageModule", e); throw; } } In looking at my log, we are logging the following error when the bind method is called: System.NullReferenceException: Object reference not set to an instance of an object. at NHibernate.Context.WebSessionContext.GetMap() at NHibernate.Context.MapBasedSessionContext.set_Session(ISession value) at NHibernate.Context.CurrentSessionContext.Bind(ISession session) Apparently, there is some issue in getting access to the HttpContext. Should this call to configure NServiceBus occur later in the lifecycle than Application_Start? Or is there another workaround that others have used to get handlers working within an Asp.NET Web application? Thanks, Steve

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• Memory leak of java.lang.ref.WeakReference objects inside JDK classes

  - by mandye

  The following simple code reproduces the growth of java.lang.ref.WeakReference objects in the heap: public static void main(String[] args) throws Exception { while (true) { java.util.logging.Logger.getAnonymousLogger(); Thread.sleep(1); } } Here is the output of jmap command within a few seconds interval: user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 22493 1079664 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 106: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 23191 1113168 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 103: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 23804 1142592 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 103: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference Note that jmap command forces FullGC. JVM settings: export JVM_OPT="\ -d64 \ -Xms200m -Xmx200m \ -XX:MaxNewSize=64m \ -XX:NewSize=64m \ -XX:+UseParNewGC \ -XX:+UseConcMarkSweepGC \ -XX:MaxTenuringThreshold=10 \ -XX:SurvivorRatio=2 \ -XX:CMSInitiatingOccupancyFraction=60 \ -XX:+UseCMSInitiatingOccupancyOnly \ -XX:+CMSParallelRemarkEnabled \ -XX:+DisableExplicitGC \ -XX:+CMSClassUnloadingEnabled \ -XX:+PrintGCTimeStamps \ -XX:+PrintGCDetails \ -XX:+PrintTenuringDistribution \ -XX:+PrintGCApplicationConcurrentTime \ -XX:+PrintGCApplicationStoppedTime \ -XX:+PrintGCApplicationStoppedTime \ -XX:+PrintClassHistogram \ -XX:+ParallelRefProcEnabled \ -XX:SoftRefLRUPolicyMSPerMB=1 \ -verbose:gc \ -Xloggc:$GCLOGFILE" java version "1.6.0_18" Java(TM) SE Runtime Environment (build 1.6.0_18-b07) Java HotSpot(TM) Server VM (build 16.0-b13, mixed mode) Solaris 10/Sun Fire(TM) T1000

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• Run time error: what's wrong?

  - by javacode

  I am getting run time error import javax.mail.*; import javax.mail.internet.*; import java.util.*; public class SendMail { public static void main(String [] args)throws MessagingException { SendMail sm=new SendMail(); sm.postMail(new String[]{"[email protected]"},"hi","hello","[email protected]"); } public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException { boolean debug = false; //Set the host smtp address Properties props = new Properties(); props.put("mail.smtp.host", "webmail.emailmyname.com"); // create some properties and get the default Session Session session = Session.getDefaultInstance(props, null); session.setDebug(debug); // create a message Message msg = new MimeMessage(session); // set the from and to address InternetAddress addressFrom = new InternetAddress(from); msg.setFrom(addressFrom); InternetAddress[] addressTo = new InternetAddress[recipients.length]; for (int i = 0; i < recipients.length; i++) { addressTo[i] = new InternetAddress(recipients[i]); } msg.setRecipients(Message.RecipientType.TO, addressTo); // Optional : You can also set your custom headers in the Email if you Want msg.addHeader("MyHeaderName", "myHeaderValue"); // Setting the Subject and Content Type msg.setSubject(subject); msg.setContent(message, "text/plain"); Transport.send(msg); } } Error Exception in thread "main" java.lang.NoClassDefFoundError: SendMail Caused by: java.lang.ClassNotFoundException: SendMail at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) Could not find the main class: SendMail. Program will exit.

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• Oracle Data Provider and casting

  - by mrjoltcola

  I use Oracle's specific data provider, not the Microsoft provider that is being discontinued. The thing I've found about ODP.NET is how picky it is with data types. Where JDBC and other ADO providers just convert and make things work, ODP.NET will throw an invalid cast exception unless you get it exactly right. Consider this code: String strSQL = "SELECT DOCUMENT_SEQ.NEXTVAL FROM DUAL"; OracleCommand cmd = new OracleCommand(strSQL, conn); reader = cmd.ExecuteReader(); if (reader != null && reader.Read()) { Int64 id = reader.GetInt64(0); return id; } Due to ODP.NET's pickiness on conversion, this doesn't work. My usual options are: 1) Retrieve into a Decimal and return it with a cast to an Int64 (I don't like this because Decimal is just overkill, and at least once I remember reading it was deprecated...) Decimal id = reader.GetDecimal(0); return (Int64)id; 2) Or cast in the SQL statement to make sure it fits into Int64, like NUMBER(18) String strSQL = "SELECT CAST(DOCUMENT_SEQ.NEXTVAL AS NUMBER(18)) FROM DUAL"; I do (2), because I feel its just not clean pulling a number into a .NET Decimal when my domain types are Int32 or Int64. Other providers I've used are nice (smart) enough to do the conversion on the fly. Any suggestions from the ODP.NET gurus?

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• android: tesseract force close

  - by Vishnu Mohan G

  I tried the tesseract tutorial here and get the following error: 06-03 01:18:52.626: E/AndroidRuntime(15103): FATAL EXCEPTION: main 06-03 01:18:52.626: E/AndroidRuntime(15103): java.lang.ExceptionInInitializerError 06-03 01:18:52.626: E/AndroidRuntime(15103): at o.c.r.LetsTryOCrActivity.onCreate(LetsTryOCrActivity.java:28) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.access$1500(ActivityThread.java:123) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.os.Handler.dispatchMessage(Handler.java:99) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.os.Looper.loop(Looper.java:130) 06-03 01:18:52.626: E/AndroidRuntime(15103): at android.app.ActivityThread.main(ActivityThread.java:3835) 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.reflect.Method.invokeNative(Native Method) 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.reflect.Method.invoke(Method.java:507) 06-03 01:18:52.626: E/AndroidRuntime(15103): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847) 06-03 01:18:52.626: E/AndroidRuntime(15103): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605) 06-03 01:18:52.626: E/AndroidRuntime(15103): at dalvik.system.NativeStart.main(Native Method) 06-03 01:18:52.626: E/AndroidRuntime(15103): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load lept: findLibrary returned null 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.Runtime.loadLibrary(Runtime.java:429) 06-03 01:18:52.626: E/AndroidRuntime(15103): at java.lang.System.loadLibrary(System.java:554) 06-03 01:18:52.626: E/AndroidRuntime(15103): at com.googlecode.tesseract.android.TessBaseAPI.(TessBaseAPI.java:42) 06-03 01:18:52.626: E/AndroidRuntime(15103): ... 14 more Please help me solve this. thanks in Advance!.

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• How to check name of Domino Server to which lotus notes is configured? using C#

  - by Preeti

  Hi, I am trying to login Domino server. For that i am taking Lotus Notes Password and Domino Server Name from user. if (notesPassword == "" && serverName == "") { MessageBox.Show("Please enter the server name !! "); return; } else { if (connectToDomino(notesPassword, serverName)) { MessageBox.Show("Connection Established Succesfully!!.."); } else { MessageBox.Show("Connection Fail.Please Login Again To Begin"); } }//else and in public bool connectToDomino(string NotesPassword, string strDominoServerName) { try { if (_lotesNotesSession == null) { NotesSession notesSession = new Domino.NotesSessionClass(); notesSession.Initialize(NotesPassword); } return true; } catch(Exception ex) { return false; } } Here i am initializing notes password.So in this case it is just verifying Notes Password. So even if user enters invalid entry of server name above function will return true. I tried : string serverName = notesSession.ServerName; But it is showing null value. :( Regards, Preeti

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• Cannot return view model after POST

  - by Interfector

  HI, I am trying to return a model after a POST but I receive the following error: Exception Details: System.InvalidOperationException: Operation is not valid due to the current state of the object. Line 29: public UsersModel getUser(Int32 id) { Line 30: return ( Line 31: from users in db.NUsers Line 32: join userSettings in db.NUsersSettings The code in the controller looks like this: [AcceptVerbs( HttpVerbs.Post )] public ActionResult Edit( NUsers user ) { //Other code that doesn't affect the error :) UsersModel userDetails = this.usersObj.getUser( user.UserID ); return View( userDetails ); } The getUser method looks like this: public UsersModel getUser(Int32 id) { return ( from users in db.NUsers join userSettings in db.NUsersSettings on users.UserID equals userSettings.UserID where users.UserID == id select new UsersModel { UserId = Convert.ToInt32( users.UserID ), Email = Convert.ToString( users.Email ), FirstName = Convert.ToString( users.FirstName ), LastName = Convert.ToString( users.LastName ), Language = Convert.ToString( userSettings.Language ), Phone = Convert.ToString( users.Phone ) } ).First(); } and finally the UsersModel if you think it is relevant: public class UsersModel { public int UserId; public string Email; public string FirstName; public string LastName; public string Language; public string Phone; public List<NLanguages> Languages; public UsersModel() { Models.Languages languagesObj = new Models.Languages(); Languages = languagesObj.getLanguages(); } } Any thoughts on what might be causing the error and what can I do to fix it? Thx

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• What Language Feature Can You Just Not Live Without?

  - by akdom

  I always miss python's built-in doc strings when working in other languages. I know this may seem odd, but it allows me to cut down significantly on excess comments while still providing a clean description of my code and any interfaces therein. What Language Feature Can You Just Not Live Without? If someone were building a new language and they asked you what one feature they absolutely must include, what would it be? This is getting kind of long, so I figured I'd do my best to summarize: Paraphrased to be language agnostic. If you know of a language which uses something mentioned, please at it in the parenthesis to the right of the feature. And if you have a better format for this list, by all means try it out (if it doesn't seem to work, I'll just roll back). Regular Expressions ~ torial (Perl) Garbage Collection ~ SaaS Developer (Python, Perl, Ruby, Java, .NET) Anonymous Functions ~ Vinko Vrsalovic (Lisp, Python) Arithmetic Operators ~ Jeremy Ross (Python, Perl, Ruby, Java, C#, Visual Basic, C, C++, Pascal, Smalltalk, etc.) Exception Handling ~ torial (Python, Java, .NET) Pass By Reference ~ Chris (Python) Unified String Format WalloWizard (C#) Generics ~ torial (Python, Java, C#) Integrated Query Equivalent to LINQ ~ Vyrotek (C#) Namespacing ~ Garry Shutler () Short Circuit Logic ~ Adam Bellaire ()

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• Silverlight 4 seems like starving of memory

  - by Marco

  I have been playing a bit with Silverlight and try to port my Silverlight 3.0 application to Silverlight 4.0. My application loads different XAP files and upon a user request create an instance of a Xaml user control and adds it to the main container, in a sort of MEF approach in order I can have an extensible and pluggable application. The application is pretty huge and to keep acceptable the performances and the initial loading I have built up some helper classes to load in the background all pages and user controls that might be used later on. On Silverlight 3.0 everything was running smoothly without any problem so far. Switching to SL 4.0 I have noticed that when the process approaches to create the instances of the user controls the layout freezes unexpectedly for a minute and sometimes for more. Looking at the task manager the memory usage of IE jumps from 50MB to 400MB and sometimes up to 1.5 GB. If the process won't take that much the layout is rendered properly even though the memory usage is still extremely high. Otherwise everything crashes due to out of memory exception. Running the same application compiled in SL3, the memory used is about 200MB when all the usercontrols are loaded. Time spent to load the application in SL3 is about 10 seconds, while it takes up to 3 mins in SL4 There are no transparencies, no opacities set, no effects and animations in the layout. User controls are instantied on the fly and added or removed in the visual tree on purpose when the user switches from one screen to another. The resources are all cleaned properly when a usercontrol is removed from the visual tree to allow the GC to operate in the background. I may do something wrong but I could not figure out where exactly nail out the source of this problem. As far as I know there is no memory profiler in SL4 that can help me out to find where to look at. But again I could not be updated on new debugging tools available.

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• Trouble creating a Java policy server for a simple Flash app

  - by simonwulf

  I'm trying to create a simple Flash chat application for educational purposes, but I'm stuck trying to send a policy file from my Java server to the Flash app (after several hours of googling with little luck). The policy file request reaches the server that sends a harcoded policy xml back to the app, but the Flash app doesn't seem to react to it at all until it gives me a security sandbox error. I'm loading the policy file using the following code in the client: Security.loadPolicyFile("xmlsocket://myhostname:" + PORT); The server recognizes the request as "<policy-file-request/" and responds by sending the following xml string to the client: public static final String POLICY_XML = "<?xml version=\"1.0\"?>" + "<cross-domain-policy>" + "<allow-access-from domain=\"*\" to-ports=\"*\" />" + "</cross-domain-policy>"; The code used to send it looks like this: try { _dataOut.write(PolicyServer.POLICY_XML + (char)0x00); _dataOut.flush(); System.out.println("Policy sent to client: " + PolicyServer.POLICY_XML); } catch (Exception e) { trace(e); } Did I mess something up with the xml or is there something else I might have overlooked?

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• How do you remove invalid hexadecimal characters from an XML-based data source prior to constructing

  - by Oppositional

  Is there any easy/general way to clean an XML based data source prior to using it in an XmlReader so that I can gracefully consume XML data that is non-conformant to the hexadecimal character restrictions placed on XML? Note: The solution needs to handle XML data sources that use character encodings other than UTF-8, e.g. by specifying the character encoding at the XML document declaration. Not mangling the character encoding of the source while stripping invalid hexadecimal characters has been a major sticking point. The removal of invalid hexadecimal characters should only remove hexadecimal encoded values, as you can often find href values in data that happens to contains a string that would be a string match for a hexadecimal character. Background: I need to consume an XML-based data source that conforms to a specific format (think Atom or RSS feeds), but want to be able to consume data sources that have been published which contain invalid hexadecimal characters per the XML specification. In .NET if you have a Stream that represents the XML data source, and then attempt to parse it using an XmlReader and/or XPathDocument, an exception is raised due to the inclusion of invalid hexadecimal characters in the XML data. My current attempt to resolve this issue is to parse the Stream as a string and use a regular expression to remove and/or replace the invalid hexadecimal characters, but I am looking for a more performant solution.

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• SQL Server SELECT stored procedure according to combobox.selectedvalue

  - by Jay

  In order to fill a datagridview according to the selectedvalue of a combobox I've tried creating a stored procedure. However, as I'm not 100% sure what I'm doing, depending on the WHERE statement at the end of my stored procedure, it either returns everything within the table or nothing at all. This is what's in my class: Public Function GetAankoopDetails(ByRef DisplayMember As String, ByRef ValueMember As String) As DataTable DisplayMember = "AankoopDetailsID" ValueMember = "AankoopDetailsID" If DS.Tables.Count > 0 Then DS.Tables.Remove(DT) End If DT = DAC.ExecuteDataTable(My.Resources.S_AankoopDetails, _Result, _ DAC.Parameter(Const_AankoopID, AankoopID), _ DAC.Parameter("@ReturnValue", 0)) DS.Tables.Add(DT) Return DT End Function Public Function GetAankoopDetails() As DataTable If DS.Tables.Count > 0 Then DS.Tables.Remove(DT) End If DT = DAC.ExecuteDataTable(My.Resources.S_AankoopDetails, _Result, _ DAC.Parameter(Const_AankoopID, AankoopID), _ DAC.Parameter("@ReturnValue", 0)) DS.Tables.Add(DT) Return DT End Function This is the function in the code behind the form I've written in order to fill the datagridview: Private Sub GridAankoopDetails_Fill() Try Me.Cursor = Cursors.WaitCursor dgvAankoopDetails.DataSource = Nothing _clsAankoopDetails.AankoopDetailsID = cboKeuze.SelectedValue dgvAankoopDetails.DataSource = _clsAankoopDetails.GetAankoopDetails Catch ex As Exception MessageBox.Show("An error occurred while trying to fill the data grid: " & ex.Message, "Oops!", MessageBoxButtons.OK) Finally Me.Cursor = Cursors.Default End Try End Sub And finally, this is my stored procedure: (do note that I'm not sure what I'm doing here) USE [Budget] GO /****** Object: StoredProcedure [dbo].[S_AankoopDetails] Script Date: 04/12/2010 03:10:52 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER PROCEDURE [dbo].[S_AankoopDetails] ( @AankoopID int, @ReturnValue int output ) AS declare @Value int set @Value =@@rowcount if @Value = 0 begin SELECT dbo.tblAankoopDetails.AankoopDetailsID, dbo.tblAankoopDetails.AankoopID, dbo.tblAankoopDetails.ArtikelID, dbo.tblAankoopDetails.Aantal, dbo.tblAankoopDetails.Prijs, dbo.tblAankoopDetails.Korting, dbo.tblAankoopDetails.SoortKorting, dbo.tblAankoopDetails.UitgavenDeelGroepID FROM dbo.tblAankoopDetails INNER JOIN dbo.tblAankoop ON dbo.tblAankoopDetails.AankoopID = dbo.tblAankoop.AankoopID INNER JOIN dbo.tblArtikel ON dbo.tblAankoopDetails.ArtikelID = dbo.tblArtikel.ArtikelID INNER JOIN dbo.tblUitgavenDeelGroep ON dbo.tblAankoopDetails.UitgavenDeelGroepID = dbo.tblUitgavenDeelGroep.UitgavenDeelGroepID WHERE dbo.tblAankoopDetails.Deleted = 0 and dbo.tblAankoopDetails.AankoopID = @AankoopID ORDER BY AankoopID if @@rowcount >0 begin set @ReturnValue=999 end else begin set @ReturnValue=997 end end if @Value >0 begin --Dit wil zeggen dat ik een gebruiker wil ingeven die reeds bestaat. (998) set @ReturnValue=998 end Does anyone know what I need to do to resolve this?

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• Class; Struct; Enum confusion, what is better?

  - by Angel Brighteyes

  I have 46 rows of information, 2 columns each row ("Code Number", "Description"). These codes are returned to the client dependent upon the success or failure of their initial submission request. I do not want to use a database file (csv, sqlite, etc) for the storage/access. The closest type that I can think of for how I want these codes to be shown to the client is the exception class. Correct me if I'm wrong, but from what I can tell enums do not allow strings, though this sort of structure seemed the better option initially based on how it works (e.g. 100 = "missing name in request"). Thinking about it, creating a class might be the best modus operandi. However I would appreciate more experienced advice or direction and input from those who might have been in a similar situation. Currently this is what I have: class ReturnCode { private int _code; private string _message; public ReturnCode(int code) { Code = code; } public int Code { get { return _code; } set { _code = value; _message = RetrieveMessage(value); } } public string Message { get { return _message; } } private string RetrieveMessage(int value) { string message; switch (value) { case 100: message = "Request completed successfuly"; break; case 201: message = "Missing name in request."; break; default: message = "Unexpected failure, please email for support"; break; } return message; } }

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• Find all substrings of a string - StringIndexOutOfBoundsException

  - by nazar_art

  I created class Word. Word has a constructor that takes a string argument and one method getSubstrings which returns a String containing all substring of word, sorted by length. For example, if the user provides the input "rum", the method returns a string that will print like this: r u m ru um rum I want to concatenate the substrings in a String, separating them with a newline ("\n"). Then return the string. Code: public class Word { String word; public Word(String word) { this.word = word; } /** * Gets all the substrings of this Word. * @return all substrings of this Word separated by newline */ public String getSubstrings() { String str = ""; int i, j; for (i = 0; i < word.length(); i++) { for (j = 0; j < word.length(); j++) { str = word.substring(i, i + j); str += "\n"; } } return str; } But it throws exception: java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(String.java:1911) I stuck at this point. Maybe, you have other suggestions according this method signature public String getSubstrings(). How to solve this issue?

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• Excel Automation From .NET - creating a new worksheet

  - by Andrew Shepherd

  I am attempting what seems like a simple task: using C# to create a new Excel document containing new worksheets. For some reason, I am getting a strange COM error (0x800A03EC) Has anyone managed to get this to work? Does anyone have suggestions as to how to troubleshoot this? I've isolated this into the minimum amount of code: using Microsoft.Office.Interop.Excel; using System.Diagnostics; namespace ExcelAutomation { public static class ExcelTests { public static void CreateWorksheet() { try { var app = new Microsoft.Office.Interop.Excel.Application(); app.Visible = true; var workBooks = app.Workbooks; var newWorkbook = app.Workbooks.Add(XlWBATemplate.xlWBATWorksheet); Worksheet existingWorksheet = (Worksheet)newWorkbook.Sheets[1]; Worksheet workSheet = (Worksheet)newWorkbook.Sheets.Add ( null, // before existingWorksheet, null, // 1, null //XlSheetType.xlWorksheet ); } catch (System.Runtime.InteropServices.COMException ex) { Trace.WriteLine(string.Format("Caught COMException. Message: \"{0}\"", ex.Message)); } } } } The output window now says: Caught COMException. Message: "Exception from HRESULT: 0x800A03EC"

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• Cascading persist and existing object

  - by user322061

  Hello, I am working with JPA and I would like to persist an object (Action) composed of an object (Domain). There is the Action class code: @Entity(name="action") @Table(name="action") public class Action { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="num") private int num; @OneToOne(cascade= { CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH }) @JoinColumn(name="domain_num") private Domain domain; @Column(name="name") private String name; @Column(name="description") private String description; public Action() { } public Action(Domain domain, String name, String description) { super(); this.domain=domain; this.name=name; this.description=description; } public int getNum() { return num; } public Domain getDomain() { return domain; } public String getName() { return name; } public String getDescription() { return description; } } When I persist an action with a new Domain, it works. Action and Domain are persisted. But if I try to persist an Action with an existing Domain, I get this error: javax.persistence.EntityExistsException: Exception Description: Cannot persist detached object [isd.pacepersistence.common.Domain@1716286]. Class> isd.pacepersistence.common.Domain Primary Key> [8] How can I persist my Action and automatically persist a Domain if it does not exist? If it exists, how can I just persist the Action and link it with the existing Domain. Best Regards, FF

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• How update DB table with DataSet

  - by Paul

  I am begginer with ADO.NET , I try update table with DataSet. O client side I have dataset with one table. I send this dataset on service side (it is ASP.NET Web Service). On Service side I try update table in database, but it dont 't work. public bool Update(DataSet ds) { SqlConnection conn = null; SqlDataAdapter da = null; SqlCommand cmd = null; try { string sql = "UPDATE * FROM Tab1"; string connStr = WebConfigurationManager.ConnectionStrings["Employees"].ConnectionString; conn = new SqlConnection(connStr); conn.Open(); cmd=new SqlCommand(sql,conn); da = new SqlDataAdapter(sql, conn); da.UpdateCommand = cmd; da.Update(ds.Tables[0]); return true; } catch (Exception ex) { throw ex; } finally { if (conn != null) conn.Close(); if (da != null) da.Dispose(); } } Where can be problem?

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• Create an SQL Express 2008 database in C# code, but login fails when trying to connect with a sysadm

  - by Andrés Gonzales

  I have a piece of code that creates an SQL Server Express 2008 in runtime, and then tries to connect to it to execute a database initialization script in Transact-SQL. The code that creates the database is the following: private void CreateDatabase() { using (var connection = new SqlConnection( "Data Source=.\\sqlexpress;Initial Catalog=master;" + "Integrated Security=true;User Instance=True;")) { connection.Open(); using (var command = connection.CreateCommand()) { command.CommandText = "CREATE DATABASE " + m_databaseFilename + " ON PRIMARY (NAME=" + m_databaseFilename + ", FILENAME='" + this.m_basePath + m_databaseFilename + ".mdf')"; command.ExecuteNonQuery(); } } } The database is created successfully. After that, I try to connect to the database to run the initialization script, by using the following code: private void ExecuteQueryFromFile(string filename) { string queryContent = File.ReadAllText(m_filePath + filename); this.m_connectionString = string.Format( @"Server=.\SQLExpress; Integrated Security=true;Initial Catalog={0};", m_databaseFilename); using (var connection = new SqlConnection(m_connectionString)) { connection.Open(); using (var command = connection.CreateCommand()) { command.CommandText = queryContent; command.CommandTimeout = 0; command.ExecuteNonQuery(); } } } However, the connection.Open() statement fails, throwing the following exception: Cannot open database "TestData" requested by the login. The login failed. Login failed for user 'MYDOMAIN\myusername'. I am completely puzzled by this error because the account I am trying to connect with has sysadmin privileges, which should allow me to connect any database (notice that I use a connection to the master database to create the database in the first place).

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• Facebook Connect - Using both FBML and PHP Client

  - by Ryan

  I am doing my second Facebook connect site. On my first site, I used the facebook coonect FBML to sign a user in, then I could access other information via the PHP Client. With this site, using the same exact code, it doesn't seem to be working. I'd like someone to be able to sign in using the Facebook button: <fb:login-button length="long" size="medium" onlogin="facebook_onlogin();"></fb:login-button> After they have logged in, the facebook_onlogin() function makes some AJAX requests to a PHP page which attempts to use the Facebook PHP Client. Here's the code from that page: $facebook = new Facebook('xxxxx API KEY xxxxx', 'xxxxx SECRET KEY xxxxx'); //$facebook->require_login(); ** I DONT WANT THIS LINE!! $userID = $facebook->api_client->users_getLoggedInUser(); if($userID) { $user_details = $facebook->api_client->users_getInfo($userID, 'last_name, first_name'); $firstName = $user_details[0]['first_name']; $lastName = $user_details[0]['last_name']; $this->view->userID = $userID; $this->view->firstName = $firstName; $this->view->lastName = $lastName; } The problem is that the PHP Client thinks I don't have a session key, so the $userID never get set. If I override the $userID with my facebook ID (which I am logged in with) I get this error: exception 'FacebookRestClientException' with message 'A session key is required for calling this method' in C:\wamp\www\mab\application\Facebook\facebookapi_php5_restlib.php:3003 If I uncomment the require_login(), it will get a session ID, but it redirects pages around a lot and breaks my AJAX calls. I am using the same code I successfully did this with on another site. Anyone have any ideas why the PHP client don't know about the session ID after a user has logged in with the connect button? Any ideas would be greatly appreciated. Thanks!

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• How can I find out what is stopping my object from disposing properly?

  - by SLC

  I have a rather large and complex game in C#, and in it are various monsters. The monsters are created in the game by a MonsterCreator, and each monster has various plugins that are loaded from external DLLs. When my monsters die, they call a method in the MonsterCreator, and the MonsterCreator removes them from the game map, removes them from its own internal list of monsters, and then finally calls the Dispose() method on the monster itself. The dispose method calls the dispose method of each plugin, then clears up any of its own code. This seems to work fine, with lots of monsters, but somewhere there is a bug that crops up after a while, where a monster dies, but it has already been removed - it seems the callback telling the MonsterCreator is being called over and over, when the monster should have been removed on the first call. The likely candidate is that some of the plugins for the monster register themselves with an Event that pulses them every X number of seconds so they can perform logic. Stepping through I can see that they are unregistering with the Event when they die, but something is getting through still and I don't know what it is. Do you have any advice for debugging the problem? I can't post code really because it's split across a ton of libraries and plugin dlls, so it's more a case of figuring out the best way to debug it. I threw an exception in code when the monster died callback method is thrown and the monster cannot be found on the map to be removed, so I have the misbehaviing Monster, is there a way I can see what is still linked to it?

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• Requiring library consumers reference additional assembly when using certain types

  - by Thomas G. Mayfield

  I have library code that uses ICSharpCode.SharpZipLib under the hood to make it easy to use ZIP files as data sources when running integration tests. As it stands, if I reference my library from another project, the other project will compile just fine, but when it accesses the code that uses SharpZipLib, I get an exception for it not finding the zip library: failed: System.IO.FileNotFoundException : Could not load file or assembly 'ICSharpCode.SharpZipLib, Version=0.85.5.452, Culture=neutral, PublicKeyToken=1b03e6acf1164f73' or one of its dependencies. The system cannot find the file specified. If the types in my library derived from a class in SharpZipLib, it'd generate a compile error CS0012. What other ways are there for triggering a CS0012, so that using code that requires SharpZipLib (but doesn't clearly indicate it) would cause consumer code to fail compilation? I've had similar problems in the past when I've used libraries like DeftTech.DuckTyping under the hood. I'd add my library code to a new project, start working, compile, run, and then suddenly hit an edge case that I'd used duck typing to get around and get a runtime error. What I'd most like is to have the same behavior as if I'd derived from a type in the 3rd-party library, so that a reference to my derived type generates a CS0012: The type 'type' is defined in an assembly that is not referenced. You must add a reference to assembly 'assembly'.

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