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• Mastering snow and Java development at jDays in Gothenburg

  - by JavaCecilia

  Last weekend, I took the train from Stockholm to Gothenburg to attend and present at the new Java developer conference jDays. It was professionally arranged in the Swedish exhibition hall close to the amusement park Liseberg and we got a great deal out of the top-level presenters and hallway discussions. Understanding and Improving Your Java Process Our main purpose was to spread information on JVM and our monitoring tools for Java processes, so I held a crash course in the most important terms and concepts if you want to affect the performance of your Java process. From the beginning - the JVM specification to interpretation of heap usage graphs. For correct analysis, you also need to understand something about process memory - you need space for the Java heap (-Xms for initial size and -Xmx for max heap size), but the process memory also contain the thread stacks (to a size of -Xss), JVM internal data structures used for keeping track of Java objects on the heap, method compilation/optimization, native libraries, etc. If you get long pause times, make sure to monitor your application, see the allocation rate and frequency of pause times.My colleague Klara Ward then held a presentation on the Java Mission Control product, the profiling and diagnostics tools suite for HotSpot, coming soon. The room was packed and very appreciated, Klara demonstrated four different scenarios, e.g. how to diagnose and fix latencies due to lock contention for logging.My German colleague, OpenJDK ambassador Dalibor Topic travelled to Sweden to do the second keynote on "Make the Future Java". He let us in on the coming features and roadmaps of Java, now delivering major versions on a two-year schedule (Java 7 2011, Java 8 2013, etc). Also letting us in on where to download early versions of 8, to report problems early on. Software Development in teams Being a scout leader, I'm drilled in different team building and workshop techniques, creating strong groups - of course, I had to attend Henrik Berglund's session on building successful teams. He spoke about the importance of clear goals, autonomy and agreed processes. Thomas Sundberg ended the conference by doing live remote pair programming with Alex in Rumania and a concrete tips for people wanting to try it out (for local collaboration, remember to wash and change clothes). Memory Master Keynote The conference keynote was delivered by the Swedish memory master Mattias Ribbing, showing off by remembering the order of a deck of cards he'd seen once. He made it interactive by forcing the audience to learn a memory mastering technique of remembering ten ordered things by heart, asking us to shout out the order backwards and we made it! I desperately need this - bought the book, will get back on the subject. Continuous Delivery The most impressive presenter was Axel Fontaine on Continuous Delivery. Very well prepared slides with key images of his message and moved about the stage like a rock star. The topic is of course highly interesting, how to create an infrastructure enabling immediate feedback to developers and ability to release your product several times per day. Tomek Kaczanowski delivered a funny and useful presentation on good and bad tests, providing comic relief with poorly written tests and the useful rules of thumb how to rewrite them. To conclude, we had a great time and hope to see you at jDays next year :)

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• how to uninstall the jdk 1.7.0 in the ubuntu

  - by kaiwii ho

  i encounter a very strange problem,and here is the detail: i'm going to uninstall the jdk 1.7.0.but when i use the rpm to check the appropriate name of the package,it prompt nothing.Anyway,when i use the command java -version,it will prompt the detail of the jdk 1.7.0. below is the detail: root@kaiwiiho:/usr/java# rpm -qa|grep jdk root@kaiwiiho:/usr/java# java -version java version "1.7.0" Java(TM) SE Runtime Environment (build 1.7.0-b147) Java HotSpot(TM) Server VM (build 21.0-b17, mixed mode) root@kaiwiiho:/usr/java# rpm -qa|grep jdk root@kaiwiiho:/usr/java# so what happen?And how can i uninstall it?thx

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• JSF: initial request and postback request?

  - by Harry Pham

  Please take a look at this below line of code in JSF <h:inputText id="name" value="#{customer.name}" /> Quote from java.sun.com For an initial request of the page containing this tag, the JavaServer Faces implementation evaluates the #{customer.name} expression during the render response phase of the lifecycle. During this phase, the expression merely accesses the value of name from the customer bean, as is done in immediate evaluation. For a postback request, the JavaServer Faces implementation evaluates the expression at different phases of the lifecycle, during which the value is retrieved from the request, validated, and propagated to the customer bean. I am not sure I understand initial request vs postback request. Does the client browser make two different request to the webserver?

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• Confusing Java syntax...

  - by posfan12

  I'm trying to convert the following code (from Wikipedia) from Java to JavaScript: /* * 3 June 2003, [[:en:User:Cyp]]: * Maze, generated by my algorithm * 24 October 2006, [[:en:User:quin]]: * Source edited for clarity * 25 January 2009, [[:en:User:DebateG]]: * Source edited again for clarity and reusability * 1 June 2009, [[:en:User:Nandhp]]: * Source edited to produce SVG file when run from the command-line * * This program was originally written by [[:en:User:Cyp]], who * attached it to the image description page for an image generated by * it on en.wikipedia. The image was licensed under CC-BY-SA-3.0/GFDL. */ import java.awt.*; import java.applet.*; import java.util.Random; /* Define the bit masks */ class Constants { public static final int WALL_ABOVE = 1; public static final int WALL_BELOW = 2; public static final int WALL_LEFT = 4; public static final int WALL_RIGHT = 8; public static final int QUEUED = 16; public static final int IN_MAZE = 32; } public class Maze extends java.applet.Applet { /* The width and height (in cells) of the maze */ private int width; private int height; private int maze[][]; private static final Random rnd = new Random(); /* The width in pixels of each cell */ private int cell_width; /* Construct a Maze with the default width, height, and cell_width */ public Maze() { this(20,20,10); } /* Construct a Maze with specified width, height, and cell_width */ public Maze(int width, int height, int cell_width) { this.width = width; this.height = height; this.cell_width = cell_width; } /* Initialization method that will be called when the program is * run from the command-line. Maze will be written as SVG file. */ public static void main(String[] args) { Maze m = new Maze(); m.createMaze(); m.printSVG(); } /* Initialization method that will be called when the program is * run as an applet. Maze will be displayed on-screen. */ public void init() { createMaze(); } /* The maze generation algorithm. */ private void createMaze(){ int x, y, n, d; int dx[] = { 0, 0, -1, 1 }; int dy[] = { -1, 1, 0, 0 }; int todo[] = new int[height * width], todonum = 0; /* We want to create a maze on a grid. */ maze = new int[width][height]; /* We start with a grid full of walls. */ for (x = 0; x < width; ++x) { for (y = 0; y < height; ++y) { if (x == 0 || x == width - 1 || y == 0 || y == height - 1) { maze[x][y] = Constants.IN_MAZE; } else { maze[x][y] = 63; } } } /* Select any square of the grid, to start with. */ x = 1 + rnd.nextInt (width - 2); y = 1 + rnd.nextInt (height - 2); /* Mark this square as connected to the maze. */ maze[x][y] &= ~48; /* Remember the surrounding squares, as we will */ for (d = 0; d < 4; ++d) { if ((maze[][d][][d] & Constants.QUEUED) != 0) { /* want to connect them to the maze. */ todo[todonum++] = ((x + dx[d]) << Constants.QUEUED) | (y + dy[d]); maze[][d][][d] &= ~Constants.QUEUED; } } /* We won't be finished until all is connected. */ while (todonum > 0) { /* We select one of the squares next to the maze. */ n = rnd.nextInt (todonum); x = todo[n] >> 16; /* the top 2 bytes of the data */ y = todo[n] & 65535; /* the bottom 2 bytes of the data */ /* We will connect it, so remove it from the queue. */ todo[n] = todo[--todonum]; /* Select a direction, which leads to the maze. */ do { d = rnd.nextInt (4); } while ((maze[][d][][d] & Constants.IN_MAZE) != 0); /* Connect this square to the maze. */ maze[x][y] &= ~((1 << d) | Constants.IN_MAZE); maze[][d][][d] &= ~(1 << (d ^ 1)); /* Remember the surrounding squares, which aren't */ for (d = 0; d < 4; ++d) { if ((maze[][d][][d] & Constants.QUEUED) != 0) { /* connected to the maze, and aren't yet queued to be. */ todo[todonum++] = ((x + dx[d]) << Constants.QUEUED) | (y + dy[d]); maze[][d][][d] &= ~Constants.QUEUED; } } /* Repeat until finished. */ } /* Add an entrance and exit. */ maze[1][1] &= ~Constants.WALL_ABOVE; maze[width - 2][height - 2] &= ~Constants.WALL_BELOW; } /* Called by the applet infrastructure to display the maze on-screen. */ public void paint(Graphics g) { drawMaze(g); } /* Called to write the maze to an SVG file. */ public void printSVG() { System.out.format("<svg width=\"%d\" height=\"%d\" version=\"1.1\"" + " xmlns=\"http://www.w3.org/2000/svg\">\n", width*cell_width, height*cell_width); System.out.println(" <g stroke=\"black\" stroke-width=\"1\"" + " stroke-linecap=\"round\">"); drawMaze(null); System.out.println(" </g>\n</svg>"); } /* Main maze-drawing loop. */ public void drawMaze(Graphics g) { int x, y; for (x = 1; x < width - 1; ++x) { for (y = 1; y < height - 1; ++y) { if ((maze[x][y] & Constants.WALL_ABOVE) != 0) drawLine( x * cell_width, y * cell_width, (x + 1) * cell_width, y * cell_width, g); if ((maze[x][y] & Constants.WALL_BELOW) != 0) drawLine( x * cell_width, (y + 1) * cell_width, (x + 1) * cell_width, (y + 1) * cell_width, g); if ((maze[x][y] & Constants.WALL_LEFT) != 0) drawLine( x * cell_width, y * cell_width, x * cell_width, (y + 1) * cell_width, g); if ((maze[x][y] & Constants.WALL_RIGHT) != 0) drawLine((x + 1) * cell_width, y * cell_width, (x + 1) * cell_width, (y + 1) * cell_width, g); } } } /* Draw a line, either in the SVG file or on the screen. */ public void drawLine(int x1, int y1, int x2, int y2, Graphics g) { if ( g != null ) g.drawLine(x1, y1, x2, y2); else System.out.format(" <line x1=\"%d\" y1=\"%d\"" + " x2=\"%d\" y2=\"%d\" />\n", x1, y1, x2, y2); } } Anyway, I was chugging along fairly quickly when I came to a bit that I just don't understand: /* Remember the surrounding squares, as we will */ for (var d = 0; d < 4; ++d) { if ((maze[][d][][d] & Constants.QUEUED) != 0) { /* want to connect them to the maze. */ todo[todonum++] = ((x + dx[d]) << Constants.QUEUED) | (y + dy[d]); maze[][d][][d] &= ~Constants.QUEUED; } } What I don't get is why there are four sets of brackets following the "maze" parameter instead of just two, since "maze" is a two dimensional array, not a four dimensional array. I'm sure there's a good reason for this. Problem is, I just don't get it. Thanks!

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• Access VBA sub with form as parameter doesn't alter the form

  - by Ski

  I have a Microsoft Access 2003 file with various tables of data. Each table also has a duplicate of it, with the name '[original table name]_working'. Depending on the user's choices in the switchboard, the form the user choose to view must switch its recordsource table to the working table. I refactored the relevant code to do such a thing into the following function today: Public Sub SetFormToWorking(ByRef frm As Form) With frm .RecordSource = rst![Argument] & "_working" .Requery Dim itm As Variant For Each itm In .Controls If TypeOf itm Is subForm Then With Item Dim childFields As Variant, masterFields As Variant childFields = .LinkChildFields masterFields = .LinkMasterFields .Form.RecordSource = .Form.RecordSource & "_working" .LinkChildFields = childFields .LinkMasterFields = masterFields .Form.Requery End With End If Next End With End Sub The lines of code that call the function look like this: SetFormToWorking Forms(rst![Argument]) and SetFormToWorking Forms(cmbTblList) For some reason, the above function doesn't change the recordsource for the form. I added the 'ByRef' keyword to the parameter just to be certain that it was passing by reference, but no dice. Hopefully someone here can tell me what I've done wrong?

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• Access Violation When Writing Dynamic 2D Array... Sometimes

  - by Shraptnel

  This program is meant to generate a dynamic array, however it gives an access violation error when writing when given certain dimensions. Eg: R = 6, C = 5 crashes, but then R = 5, C = 6 doesn't. In case your wondering, it isn't my homework to "fix" this broken program, this is the method we were taught in class. Also part of my assessment is to use this method, so vectors are out. Thanks in advance! #include <iostream> using namespace std; int main(){ const int R = 6; const int C = 5; char **d; d = new char *[R]; for(int i=0; i<C; ++i){ d[i] = new char[C]; } //initialise for(int i=0; i<R; ++i){ for(int j=0; j<C; ++j){ d[i][j] = 'd'; cout<<d[i][j]; } cout<<endl; } cout<<endl; system("pause"); return 0; }

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• Why does jruby complain about valid java_opts

  - by brad

  I have set my java min/max heap size to be the same as outlined in the Sun Docs for precise heap sizing using the following: -Xms768m -Xmx768m This works fine when I start tomcat, but if I run jruby from the command line it complains saying: Error occurred during initialization of VM Incompatible minimum and maximum heap sizes specified I read in the jruby docs about some -J-X params but it seems silly that I would need to explicitly override my normal jvm settings. The problem arises when I do a deploy. I try running jruby -S rake db:migrate on my server and it complains. Is it true that I need to explicitly override my JVM settings when running jruby? It seems as though ANY Xms/Xmx values cause jruby to complain. Update So it seems that some settings do in fact work. For instance all of these work: Xmx256m Xms256m Xmx512m Xms256m Xmx512m Xms500m But these don't: Xmx512m Xms512m Xmx512m Xms501m Xmx768m Xms512m

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• Annotations (@EJB, @Resource, ...) within a RESTful Service

  - by Dominik

  Hi! I'm trying to inject a EJB within my RESTful Service (RESTEasy) via Annotations. public class MyServelet implements MyServeletInterface { ... @EJB MyBean mybean; ... } Unfortunately there is no compilation or AS error, the variable "mybean" is just null and I get a NullPointerException when I try to use it. What I'm doing wrong? Here are some side-informations about my architecture: JBoss 4.2.2.GA Java version: 1.5.0_17 local MDB-Project remote EJB-Project WAR Project with the RESTful Service which uses the remote EJB and sends messages to the local MDB-Project Thanks in advance! br Dominik p.s: everything is working fine when I use normal context lookup.

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• Daylight Savings Handling in DateDiff() in MS Access?

  - by PowerUser

  I am fully aware of DateDiff()'s inability to handle daylight savings issues. Since I often use it to compare the number of hours or days between 2 datetimes several months apart, I need to write up a solution to handle DST. This is what I came up with, a function that first subtracts 60 minutes from a datetime value if it falls within the date ranges specified in a local table (LU_DST). Thus, the usage would be: datediff("n",Conv_DST_to_Local([date1]),Conv_DST_to_Local([date2])) My question is: Is there a better way to handle this? I'm going to make a wild guess that I'm not the first person with this question. This seems like the kind of thing that should have been added to one of the core reference libraries. Is there a way for me to access my system clock to ask it if DST was in effect at a certain date & time? Function Conv_DST_to_Local(X As Date) As Date Dim rst As DAO.Recordset Set rst = CurrentDb.OpenRecordset("LU_DST") Conv_DST_to_Local = X While rst.EOF = False If X > rst.Fields(0) And X < rst.Fields(1) Then Conv_DST_to_Local = DateAdd("n", -60, X) rst.MoveNext Wend End Function Notes I have visited and imported the BAS file of http://www.cpearson.com/excel/TimeZoneAndDaylightTime.aspx. I spent at least an hour by now reading through it and, while it may do its job well, I can't figure out how to modify it to my needs. But if you have an answer using his data structures, I'll take a look. Timezones are not an issue since this is all local time.

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• Programmatic authentication in JEE 6

  - by Kevin

  Hello, is it possible to authenticate programmatically a user in J2ee 6? Let me explain with some more details: I've got an existing Java SE project with Servlets and hibernate; where I manage manually all the authentication and access control: class Authenticator { int Id string username } Authenticator login(string username, string password) ; void doListData(Authenticator auth) { if (isLoggedIn(auth)) listData(); else doListError } void doUpdateData (Authenticator auth) { if (isLoggedAsAdmin(auth)) updateData() ; else doListError(); } void doListError () { listError() ; } And Im integrating J2ee/jpa/servlet 3/... (Glassfish 3) in this project. I've seen anotations like : @RolesAllowed ("viewer") void doListdata (...) { istData() ; } @RolesAllowed("admin") void doUpdateData (...) { updateData() ; } @PermotAll void dolisterror () { listerror() ; } but how can I manually state, in login(), that my user is in the admin and/or viewer role?

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• Generics & Collections!

  - by RayAllen

  I had a doubt. Why,generics (in java or any other lang), works with the objects and not with primitive types ? For e.g Gen< Integer inum=new Gen< Integer(100); works fine , but Gen< int inums=new Gen< int(100); is not allowed. Thanks !

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• Using getters/setters in Java

  - by Crystal

  I'm having some trouble with the idea of accessing variables from other classes. I had a post here: http://stackoverflow.com/questions/3011642/having-access-to-a-private-variable-from-other-classes-in-java where I got some useful information, and thought an example would be better show it, and ask a separate question as well. I have a form that I can input data to, and it has a List variable. I didn't make it static at first, but I thought if I needed to get the total size from another class, then I wouldn't create an instance of that class in order to use the function to getTotalContacts. I basically want to update my status bar with the total number of contacts that are in my list. One of the members said in the above post to use the original Foo member to get the contacts, but I'm not sure how that works in this case. Any thoughts would be appreciated. Thanks. import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.List; import java.util.ArrayList; public class AddressBook { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { AddressBookFrame frame = new AddressBookFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu fileMenu = new JMenu("File"); JMenuItem openItem = new JMenuItem("Open"); JMenuItem saveItem = new JMenuItem("Save"); JMenuItem saveAsItem = new JMenuItem("Save As"); JMenuItem printItem = new JMenuItem("Print"); JMenuItem exitItem = new JMenuItem("Exit"); fileMenu.add(openItem); fileMenu.add(saveItem); fileMenu.add(saveAsItem); fileMenu.add(printItem); fileMenu.add(exitItem); menuBar.add(fileMenu); JMenu editMenu = new JMenu("Edit"); JMenuItem newItem = new JMenuItem("New"); JMenuItem editItem = new JMenuItem("Edit"); JMenuItem deleteItem = new JMenuItem("Delete"); JMenuItem findItem = new JMenuItem("Find"); JMenuItem firstItem = new JMenuItem("First"); JMenuItem previousItem = new JMenuItem("Previous"); JMenuItem nextItem = new JMenuItem("Next"); JMenuItem lastItem = new JMenuItem("Last"); editMenu.add(newItem); editMenu.add(editItem); editMenu.add(deleteItem); editMenu.add(findItem); editMenu.add(firstItem); editMenu.add(previousItem); editMenu.add(nextItem); editMenu.add(lastItem); menuBar.add(editMenu); JMenu helpMenu = new JMenu("Help"); JMenuItem documentationItem = new JMenuItem("Documentation"); JMenuItem aboutItem = new JMenuItem("About"); helpMenu.add(documentationItem); helpMenu.add(aboutItem); menuBar.add(helpMenu); frame.setVisible(true); } }); } } class AddressBookFrame extends JFrame { public AddressBookFrame() { setLayout(new BorderLayout()); setTitle("Address Book"); setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); AddressBookToolBar toolBar = new AddressBookToolBar(); add(toolBar, BorderLayout.NORTH); AddressBookStatusBar aStatusBar = new AddressBookStatusBar(); add(aStatusBar, BorderLayout.SOUTH); AddressBookForm form = new AddressBookForm(); add(form, BorderLayout.CENTER); } public static final int DEFAULT_WIDTH = 500; public static final int DEFAULT_HEIGHT = 500; } /* Create toolbar buttons and add buttons to toolbar */ class AddressBookToolBar extends JPanel { public AddressBookToolBar() { setLayout(new FlowLayout(FlowLayout.LEFT)); JToolBar bar = new JToolBar(); JButton newButton = new JButton("New"); JButton editButton = new JButton("Edit"); JButton deleteButton = new JButton("Delete"); JButton findButton = new JButton("Find"); JButton firstButton = new JButton("First"); JButton previousButton = new JButton("Previous"); JButton nextButton = new JButton("Next"); JButton lastButton = new JButton("Last"); bar.add(newButton); bar.add(editButton); bar.add(deleteButton); bar.add(findButton); bar.add(firstButton); bar.add(previousButton); bar.add(nextButton); bar.add(lastButton); add(bar); } } /* Creates the status bar string */ class AddressBookStatusBar extends JPanel { public AddressBookStatusBar() { setLayout(new FlowLayout(FlowLayout.LEFT)); this.statusBarString = new JLabel("Total: " + AddressBookForm.getTotalContacts()); add(this.statusBarString); } public void updateLabel() { contactsLabel.setText(AddressBookForm.getTotalContacts().toString()); } private JLabel statusBarString; private JLabel contactsLabel; } class AddressBookForm extends JPanel { public AddressBookForm() { // create form panel this.setLayout(new GridLayout(2, 1)); JPanel formPanel = new JPanel(); formPanel.setLayout(new GridLayout(4, 2)); firstName = new JTextField(20); lastName = new JTextField(20); telephone = new JTextField(20); email = new JTextField(20); JLabel firstNameLabel = new JLabel("First Name: ", JLabel.LEFT); formPanel.add(firstNameLabel); formPanel.add(firstName); JLabel lastNameLabel = new JLabel("Last Name: ", JLabel.LEFT); formPanel.add(lastNameLabel); formPanel.add(lastName); JLabel telephoneLabel = new JLabel("Telephone: ", JLabel.LEFT); formPanel.add(telephoneLabel); formPanel.add(telephone); JLabel emailLabel = new JLabel("Email: ", JLabel.LEFT); formPanel.add(emailLabel); formPanel.add(email); add(formPanel); // create button panel JPanel buttonPanel = new JPanel(); JButton insertButton = new JButton("Insert"); JButton displayButton = new JButton("Display"); ActionListener insertAction = new AddressBookListener(); ActionListener displayAction = new AddressBookListener(); insertButton.addActionListener(insertAction); displayButton.addActionListener(displayAction); buttonPanel.add(insertButton); buttonPanel.add(displayButton); add(buttonPanel); } public static int getTotalContacts() { return addressList.size(); } //void addContact(Person contact); private JTextField firstName; private JTextField lastName; private JTextField telephone; private JTextField email; private JLabel contacts; private static List<Person> addressList = new ArrayList<Person>(); private class AddressBookListener implements ActionListener { public void actionPerformed(ActionEvent e) { String buttonPressed = e.getActionCommand(); System.out.println(buttonPressed); if (buttonPressed == "Insert") { Person aPerson = new Person(firstName.getText(), lastName.getText(), telephone.getText(), email.getText()); addressList.add(aPerson); } else { for (Person p : addressList) { System.out.println(p); } } } } } My other question is why do I get the error, "int cannot be dereferenced contactsLabel.setText(AddressbookForm.getTotalContacts().toString()); Thanks!

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• Help securing files access with htaccess and php?

  - by bschaeffer

  I'm working on a site that allows users to purchase digital content and have implemented a method that attempts to serve secure downloads. I'm using CodeIgniter to force downloads like this: $file = file_get_contents($path); force_download("my_file_name.zip", $file); Of course, I make sure the user has access to the file using a database before serving the download, but I was wondering if there was a way to make these files more secure. I'm using a some 8-10 letter keys to create the file paths so urls to the files aren't exactly easy to figure out... something like http://mysite.com/as67Hgr/asdo0980/uth89.zip in lieu of http://mysite.com/downloads/my_file.zip. Also, I'm using .htaccess to deny directory browsing like so: Options All -Indexes. Other than that... I have no idea what steps to take. I've seen articles suggesting username and password methods using .htaccess, but I don't understand how to bypass the password prompt that would occur using that method. I was hoping there might be a method where I could send a username and password combination using headers and cUrl (or something similar), but I wouldn't know where to start. Any help would be hugely appreciated. Thanks in advance!

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• #Error showing up in multiple LEFT JOIN statement Access query when value should be NULL

  - by lar

  I'm trying to return an ID's last 4 years of data, if existing. The table (call it A_TABLE) looks like this: ID, Year, Val The idea behind the query is this: for each ID/Year in the table, LEFT JOIN with Year-1, Year-2, and Year-3 (to get 4 years of data) and then return Val for each year. Here's the SQL: SELECT a.ID, a.year AS [Year], a.Val AS VAL, a1.year AS [Year-1], a1.Val AS [VAL-1], a2.year AS [Year-2], a2.Val AS [VAL-2], a3.year AS [Year-3], a3.Val AS [VAL-3] FROM ( ([A_TABLE] AS a LEFT JOIN [A_TABLE] AS a1 ON (a.ID = a1.ID) AND (a.year = a1.year+1)) LEFT JOIN [A_TABLE] AS a2 ON (a.ID = a2.ID) AND (a.year = a2.year+2)) LEFT JOIN [A_TABLE] AS a3 ON (a.ID = a3.ID) AND (a.year = a3.year+3) The problem is that, for past years where there is no data (eg, Year-1), I see "#Error" in the appropriate VAL column (eg, [VAL-1]). The weird thing is, I see the expected "null" in the Year column (eg, [YEAR-1]). Some sample data: ID YEAR VAL Dave 2004 1 Dave 2006 2 Dave 2007 3 Dave 2008 5 Dave 2009 0 outputs like this: ID YEAR VAL YEAR-1 VAL-1 YEAR-2 VAL-2 YEAR-3 VAL-3 Dave 2004 1 #Error #Error #Error Dave 2006 2 #Error 2004 1 #Error Dave 2007 3 2006 2 #Error 2004 1 Dave 2008 5 2007 3 2006 2 #Error Dave 2009 0 2008 5 2007 3 2006 2 Does that make sense? Why am I getting the appropriate NULL val for the non-existent YEARs, but an #Error for the non-existent VALs? (This is Access 2000. Conditional statements like "IIf(a1.val is null, -999, a1.val)" do not seem to do anything.) EDIT: It turns out that the errors are somehow caused by the fact that A_TABLE is actually a query. When I put all the data into an actual table and run the same query, everything shows up as it should. Thanks for the help, everyone.

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• Difference between Apache Tapestry and Apache Wicket

  - by Stephan Schmidt

  Apache Wicket ( http://wicket.apache.org/ ) and Apache Tapestry ( http://wicket.apache.org/ ) are both component oriented web frameworks - contrary to action based frameworks like Stripes - by the Apache Foundation. Both allow you to build your application from components in Java. They both look very similar to me. What are the differences between those two frameworks? Has someone experience in both? Specifically: How is their performance, how much can state handling be customized, can they be used stateless? What is the difference in their component model? What would you choose for which applications? How do they integrate with Guice, Spring, JSR 299? Edit: I have read the documentation for both and I have used both. The questions cannot be answered sufficently from reading the documentation, but from the experience from using these for some time, e.g. how to use Wicket in a stateless mode for high performance sites. Thanks.

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• .Net website create directory to remote server access denied

  - by tmfkmoney

  I have a web application that creates directories. The application works fine when creating a directory on the web server, however, it does not work when it tries to create a directory on our remote fileserver. The fileserver and the webserver are in the same domain. I have created a local user in our domain, "DOMAIN\aspnet". The local user is on both servers. I am running my .Net app pool under the domain user. I have also tried using windows impersonate in the web.config to run under the domain user. I have verified that the domain user has full control to the remote directory. In an effort to debug this I have also given the "everyone" full control to the remote directory. In an effort to debug this I have also added the domain user to the administrators group. I have a simple .net test page on the web server to test this. Through the test page I am able to read the directory on the file server and get a list of everything in it. I am not able to upload files or to create directories on the file server. Here's code that works: var path = @"\\fileserver\images\"; var di = new DirectoryInfo(path); foreach (var d in di.GetDirectories()) { Response.Write(d.Name); } Here's code that doesn't work: path = Path.Combine(path, "NewDirectory"); Directory.CreateDirectory(path); Here's the error I'm getting: Access to the path '\fileserver\images\NewDirectory' is denied. I'm pretty stuck on this. Any ideas?

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• Access generic type parameter at runtime?

  - by Bart van Heukelom

  Event dispatcher interface public interface EventDispatcher { <T> EventListener<T> addEventListener(EventListener<T> l); <T> void removeEventListener(EventListener<T> l); } Implementation public class DefaultEventDispatcher implements EventDispatcher { @SuppressWarnings("unchecked") private Map<Class, Set<EventListener>> listeners = new HashMap<Class, Set<EventListener>>(); public void addSupportedEvent(Class eventType) { listeners.put(eventType, new HashSet<EventListener>()); } @Override public <T> EventListener<T> addEventListener(EventListener<T> l) { Set<EventListener> lsts = listeners.get(T); // ****** error: cannot resolve T if (lsts == null) throw new RuntimeException("Unsupported event type"); if (!lsts.add(l)) throw new RuntimeException("Listener already added"); return l; } @Override public <T> void removeEventListener(EventListener<T> l) { Set<EventListener> lsts = listeners.get(T); // ************* same error if (lsts == null) throw new RuntimeException("Unsupported event type"); if (!lsts.remove(l)) throw new RuntimeException("Listener is not here"); } } Usage EventListener<ShapeAddEvent> l = addEventListener(new EventListener<ShapeAddEvent>() { @Override public void onEvent(ShapeAddEvent event) { // TODO Auto-generated method stub } }); removeEventListener(l); I've marked two errors with a comment above (in the implementation). Is there any way to get runtime access to this information?

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• Data is not saved in MS Access database

  - by qwerty

  Hello, I have a visual C# project and i'm trying to insert data in a MS Access Database when i press a button. Here is the code: private void button1_Click(object sender, EventArgs e) { try { OleDbDataAdapter adapter=new OleDbDataAdapter(); adapter.InsertCommand = new OleDbCommand(); adapter.InsertCommand.CommandText = "insert into Candidati values ('" + maskedTextBox1.Text.Trim() + "','" + textBox1.Text.Trim() + "', '" + textBox2.Text.Trim() + "', '" + textBox3.Text.Trim() + "','" + Convert.ToDouble(maskedTextBox2.Text) + "','" + Convert.ToDouble(maskedTextBox3.Text) + "')"; con.Open(); adapter.InsertCommand.Connection = con; adapter.InsertCommand.ExecuteNonQuery(); con.Close(); MessageBox.Show("Inregistrare adaugata cu succes!"); maskedTextBox1.Text = null; maskedTextBox2.Text = null; maskedTextBox3.Text = null; textBox1.Text = null; textBox2.Text = null; textBox3.Text = null; maskedTextBox1.Focus(); } catch (AdmitereException exc) { MessageBox.Show("A aparut o exceptie: "+exc.Message, "Eroare!", MessageBoxButtons.OK, MessageBoxIcon.Error); } } The connection string is: private static string connectionString; OleDbConnection con; public AddCandidati() { connectionString = "Provider=Microsoft.JET.OLEDB.4.0;Data Source=Admitere.mdb"; con = new OleDbConnection(connectionString); InitializeComponent(); } Where AddCandidati is the form. The data is not saved in the database, why? I have the .mdb file in the project folder.. What i'm doing wrong? I did not got any exception when i press the button.. Thanks!

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• Database access through collections

  - by Mike

  Hi All, I have an 3 tiered application where I need to get database results and populated the UI. I have a MessagesCollection class that deals with messages. I load my user from the database. On the instantiation of a user (ie. new User()), a MessageCollection Messages = new MessageCollection(this) is performed. Message collection accepts a user as a parameter. User user = user.LoadUser("bob"); I want to get the messages for Bob. user.Messages.GetUnreadMessages(); GetUnreadMessages calls my Business Data provider which in turn calls the data access layer. The Business data provider returns List. My question is - I am not sure what the best practice is here - If I have a collection of messages in an array inside the MessagesCollection class, I could implement ICollection to provide GetEnumerator() and ability to traverse the messages. But what happens if the messages change and the the user has old messages loaded? What about big message collections? What if my user had 10,000 unread messages? I don't think accessing the database and returning 10,000 Message objects would be efficient.

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• Access is denied

  - by Lasse Gaardsholt

  Hi, I got this code for my sharepoint, but I get a Access is Denied, can anyone help me out here ? <!-- Load and display list - iframe version --> <!-- Questions and comments: [email protected] --> <DIV id="ListPlaceholder"><IMG src="/_layouts/images/GEARS_AN.GIF"></DIV> <!-- Paste the URL of the source list below: --> <iframe id="SourceList" style="display:none;" src="xXxXxX" onload="DisplayThisList()"></iframe> <script type="text/javascript"> function DisplayThisList() { var placeholder = document.getElementById("ListPlaceholder"); var displaylist = null; var sourcelist = document.getElementById("SourceList"); try { if(sourcelist.contentWindow) // Internet Explorer { displaylist = sourcelist.contentWindow.document.getElementById("WebPartWPQ1") ; } } catch(err) { alert(err.message); } displaylist.removeChild(displaylist.getElementsByTagName("table")[0]); placeholder.innerHTML = displaylist.innerHTML; } </script>

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• Inject a EJB into JAX-RS (RESTfull service)

  - by Zeck

  Hi guys, I'm trying to inject Stateless EJB into my JAX-RS webservice via Annotations. Unfortunately the ejb is just null and I get a NullPointerException when I try to use it. @Path("book") public class BookResource { @EJB private BookEJB bookEJB; public BookResource() { } @GET @Produces("application/xml") @Path("/{bookId}") public Book getBookById(@PathParam("bookId") Integer id) { return bookEJB.findById(id); } } What am I wrong doing? Here are some informations about my machine: Glassfish 3.1 Netbeans 6.9 RC 2 Java EE 6 Can you guys put some working example? And thank you for every advises and examples?

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• Access reading error when using class member variable

  - by bsg

  Hi, I have a class with private member variables declared in a header file. In my constructor, I pass in some filenames and create other objects using those names. This works fine. When I try to add another member variable, however, and initialize it in the constructor, I get an access reading violation. I sent the code to someone else and it works fine on his computer. Any idea what could be wrong? Here is the offending code: The .h file: class QUERYMANAGER { INDEXCACHE *cache; URLTABLE *table; SNIPPET *snip; int* iquery[MAX_QUERY_LENGTH]; int* metapointers[MAX_QUERY_LENGTH]; int blockpointers[MAX_QUERY_LENGTH]; int docpositions[MAX_QUERY_LENGTH]; int numberdocs[MAX_QUERY_LENGTH]; int frequencies[MAX_QUERY_LENGTH]; int docarrays[MAX_QUERY_LENGTH][256]; int qsize; public: QUERYMANAGER(); QUERYMANAGER(char *indexfname, char *btfname, char *urltablefname, char *snippetfname, char *snippetbtfname); ~QUERYMANAGER(); This is the .cpp file: #include "querymanagernew.h" #include "snippet.h" using namespace std; QUERYMANAGER::QUERYMANAGER(char *indexfname, char *btfname, char *urltablefname, char *snippetfname, char *snippetbtfname){ cache = new INDEXCACHE(indexfname, btfname); table = new URLTABLE(urltablefname); snip = new SNIPPET(snippetfname, snippetbtfname); //this is where the error occurs qsize = 0; } I am totally at a loss as to what is causing this - any ideas? Thanks, bsg

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• Why is this exception thrown when trying to match this regex in Java?

  - by Scott Ferguson

  I'm trying to match a specific string out of a an HTML document and have this regex pattern to grab it: Pattern somePattern = Pattern.compile("var json = ({\"r\":\"^d1\".*});"); However when I try to hit that code at runtime, I get this error: FATAL EXCEPTION: Timer-0 java.util.regex.PatternSyntaxException: Syntax error U_REGEX_RULE_SYNTAX near index 13: var json = ({"r":"^d1".*}); ^ at com.ibm.icu4jni.regex.NativeRegEx.open(Native Method) at java.util.regex.Pattern.compileImpl(Pattern.java:383) at java.util.regex.Pattern.<init>(Pattern.java:341) at java.util.regex.Pattern.compile(Pattern.java:317) Can anybody tell me what I'm doing wrong?

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• java : How can I cast Date from "Thu May 01 00:00:00 WEST 2014 " to "2014-01-05 00:00:00.0"

  - by lilyana

  How can I want to cast Date from "Thu May 01 00:00:00 WEST 2014 " to "2014-01-05 00:00:00.0" I try with this code : SimpleDateFormat toFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S"); String dateStr = getDtdebut().toString(); Date date = new Date(); try { date = toFormat.parse(dateStr); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } but i have this error : java.text.ParseException: Unparseable date: "Thu May 01 00:00:00 WEST 2014" at java.text.DateFormat.parse(Unknown Source) at ensa.pfe.action.GestionOperations.filtre(GestionOperations.java:386) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440) at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242) ..........

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• Date Picker Control Not Displaying Proper Date (Access 2003)

  - by JPM

  Hi everyone, I just have a quick question. I am maintaining an app for my summer co-op position, and a new requirement came down today where the user requested to have a date control added to a form to mark the date of when an employee is "laid off". This control is enabled/disabled by a toggle button, and has its control source bound to a field that I added in the database. All the functionality has been added and tested, but.... The issue I am having is that the date picker is on a tab control (the 2nd page) and I am having problems trying to get the control to display the date that is stored in the field I created. I know the control is storing any changes made using it, but since the user asked to move the control over to the 2nd tab (it was on the first), it just shows today's date, not the date entered using the control. To make things a little more strange, if I place the control anywhere except the tab control, it seems to be working fine. I've even placed a textbox on the tab and set its control source to the database field, and it displays just fine. What gives? And I have registered the .ocx with Access, and as I mentioned before, the actual database is storing the data. Just not displaying it. Any ideas as to what I am doing wrong?

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