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  • Resources for learning about Threading

    - by Incubuss
    I've spent the last year learning and using Java in university but we didn't do much (read: anything) in terms of Threading. We do some next year but I'm hopeful I'll be able to get a head start over the summer. What are the best resources for learning about and getting to grips with Threading?

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  • JTable .. colour of selected row

    - by dimitar
    Hello pip`s, I have a JTable in Java that has a custom dataMOdel and custom renderer. Now when i select some cell it has a dark blue border around it. I want the selected row to be all highlighted in some colour. How to do that?

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  • Tips for creating a video-voice-chat application

    - by Marco
    I want to create a simple chat application that supports voice and video (something like Skype or Google Talk). I don't want to write everything from scratch, so my question is do you know some good libraries for that? I stumbled over libjingle (c++) and Smash (Java), both implementing the XMPP extension Jingle. Would you recommend one of those?

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  • "Cannot find symbol" problem.

    - by joseph
    I'm getting the Cannot find symbol error from my code. Does anyone know what can cause this problem? // Register JDBC driver Class.forName("net.sourceforge.jtds.jdbc.Driver"); method forName(java.Lang.String) Class.forName("net.sourceforge.jtds.jdbc.Driver); ^

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  • Spring + Hessian on Tomcat

    - by ILya
    Hello. I have a task to write a web service with use of Hessian and Spring. Unfortunately there is not enough information so i can't make it work myself... Please can anyone write a simple Hello World for me? My version always shows 404 when accesing with browser... I'm new to java so if smb knows how to help tell me what files of my project to share. Thanks a lot!

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  • How do I run my application as superuser from Eclipse?

    - by Ronald
    I'm running in to an error when I try to run my server application from Eclipse. The error is java.net.BindException: Permission denied. I think this is because I am using port 443 to set up an SSL connection. I can get around this problem if I run my code on the command line using javac and sudo. Is there a way to set up Eclipse so that when I hit the run button, my application is executed with sudo?

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  • tryin' to enumerate all available Wifi network with J2SE

    - by Rob
    Hi, I'd like to find out a way to enumerate all available wifi networks using Java 6.0 and any third-party API. Unfortunately, I'm not able to find a solution to this problem, all I got is a library that I can't use because I don't have any example. I'll be very pleased if someone could help me. The target platform is Win XP/7. Edit: the library I found is named jwlanscan Rob

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  • How do I create a dll project with Eclipse Ganymede?

    - by MRFerocius
    Guys; How are you doing today? I have to create a dll project on Eclipse Ganymede and I don´t know where to start... (I am a C# guy with VS). Can you please indicate me what type of project should I create to make a dll on Eclipse Ganymede so I can call the DLL from other Java Project? Thanks in advanced :D

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  • two dimensional array [closed]

    - by Baiba
    Can someone please write to me source code in Java? I have a task: create a program, that contains two dimensional array (with numbers) and the programm needs to sum zeros in each column and then get out the number of column in which the zeros are least.. thanks!

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  • Struts2 converting empty string parameter to an "int"

    - by Kyle Partridge
    How does one convert an empty string to an int using Struts2. When the application encounters this parameter with no value, like from an empty text field, it throws the following exception. java.lang.NoSuchMethodException: com.XXXXXXXXXXXX.setID([Ljava.lang.String;) Where ID is an integer, and the URL is: Something.action?ID=&other=rawr Is there a way to do this without using an Integer (class)? Do I have to write a type converter?

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  • Are Maybes a good pattern for scala?

    - by Fred Haslam
    For a while I have been struggling to integrate scala with java methods that might return null. I came up with the following utility which helps a lot: // produce an Option, nulls become None object Maybe { def apply[T](t:T) = if (t==null) None else Some(t) } Maybe(javaClass.getResultCouldBeNull()).map( result => doSomeWork(result) ) I have a few questions about this solution: Is there a better or more standard pattern to use? Am I duplicating something that already exists? Does this functionality have hidden gotchas?

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  • How to LIMIT the text box length?

    - by sam
    I am working on eclipse java using swt jface with rcp. How can i limit the characters in my text box. Like if i want only 4 characters in my text box then what should i do? and what if i want alphanumeric combination . again in certain limit?

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  • VB6's private static in C# ?

    - by blez
    In VB6 there are local static variables that keep their values after the exit of procedure. It's like using public vars but on local block. For example: sub count() static x as integer x = x + 1 end sub After 10 calls, x will be 10. I tried to search the same thing in .NET (and even Java) but there was none. Why? Does it break the OOP model in some way, and is there a way to emulate that.

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  • Usecase for Workflow Engine

    - by Icarus
    Hi, We have an issue where a Database table has to be updated on the status for a particular entity. Presently, its all Java code with a lot of if conditions and an update to the status. I was thinking along lines of using a Workflow engine since there can be multiple flows in future. Is it an overkill to use a Workflow Engine here... where do you draw the line ?

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  • Transaction Management

    - by Senthilnathan
    Hi all, In my code I am updating two table, one after the other. update(table1_details); update(table2_details); So if the update fails in table1 , table2 should not be updated or should be rolled back. How to handle this situation. I know I have to use transaction. Can some one help with code !!! I am using Java with spring and hibernate .

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  • NoClassDefFoundError when running Netbeans 6.8 application

    - by Malachi
    My application has recently started throwing NoClassDefFoundError errors when I am running my application from within NetBeans. It never used to do this. And when I run this outside of NetBeans using the command line argument that it provides once built, these errors are not produced Is this a bug with Netbeans? I have reinstalled NetBeans as I recently had another that was resolved by reinstalling, however the problem still persists. http://stackoverflow.com/questions/2654892/symbol-error-in-java-application-using-netbeans-6-8-when-adding-a-shared-project Within Netbeans Outside NetBeans

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  • Productivity research material

    - by Rune FS
    While debating which platform to use for what applications (specifically we debated c++, java, c# and f#) we tried finding scientific quality research on productivity (cost of ownership really) of similar applications build on various platforms/using the above mentioned languages. Any one know of such research?

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  • How to set text above and below a JButton icon?

    - by mre
    I want to set text above and below a JButton's icon. At the moment, in order to achieve this, I override the layout manager and use three JLabel instances (i.e. 2 for text and 1 for the icon). But this seems like a dirty solution. Is there a more direct way of doing this? Note -I'm not looking for a multi-line solution, I'm looking for a multi-label solution. Although this article refers to it as a multi-line solution, it actually seems to refer to a multi-label solution. EXAMPLE import java.awt.Component; import java.awt.FlowLayout; import javax.swing.BoxLayout; import javax.swing.Icon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; import javax.swing.UIManager; public final class JButtonDemo { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { createAndShowGUI(); } }); } private static void createAndShowGUI(){ final JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new FlowLayout()); frame.add(new JMultiLabelButton()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } private static final class JMultiLabelButton extends JButton { private static final long serialVersionUID = 7650993517602360268L; public JMultiLabelButton() { super(); setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); add(new JCenterLabel("Top Label")); add(new JCenterLabel(UIManager.getIcon("OptionPane.informationIcon"))); add(new JCenterLabel("Bottom Label")); } } private static final class JCenterLabel extends JLabel { private static final long serialVersionUID = 5502066664726732298L; public JCenterLabel(final String s) { super(s); setAlignmentX(Component.CENTER_ALIGNMENT); } public JCenterLabel(final Icon i) { super(i); setAlignmentX(Component.CENTER_ALIGNMENT); } } }

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