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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 does volatile actually work?

    - by FredOverflow
    Marking a variable as volatile in Java ensures that every thread sees the value that was last written to it instead of some stale value. I was wondering how this is actually achieved. Does the JVM emit special instructions that flush the CPU cashes or something?

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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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  • 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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  • 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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  • Convert Existing Eclipse Project to Maven Project

    - by Tom G
    For a project at work, we're considering using the Maven plugin for Eclipse to automate our builds. Right now the procedure is far more complicated than it ought to be, and we're hoping that Maven will simplify things to a one-click build. My question is, is there a wizard or automatic importer for converting an existing Eclipse Java project to a Maven project, using the Maven plugin? Or should I create a new Maven project and manually copy over all source files, libs, etc.

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  • Reading all compile errors in Windows command-line?

    - by ArdillaRoja
    Noob question, apologies. I'm compiling Java in Windows Vista's command-line and have so many syntax errors that some are being pushed off the top (a lot of 'class, interface or enum expected' errors which leads me to believe it's an obvious syntax mistake early on in the code that I can't spot). Does anyone know how I could get it to display those first errors? Thanks in advance for the help.

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  • Write a PLIST file in Groovy

    - by Joe Cannatti
    I have a Groovy application for Windows and am trying to convert a Hash object to an Apple plist file. What is the best way to go about this? Seems like this is something that must already be solved in Java but I can't seem to find any examples. Thanks in advance

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  • Problem in using j2me polish with netbeans

    - by learn
    I have downloaded and installed the j2me polish successfully and i have tried to create the project but there is a reference problem showing that the specified folder does not contain the java platform but it is successfully working with normal project instead of polish which LWUIT to use?

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  • Iterating Collection In Two Threads

    - by ChloeRadshaw
    This question relates both to C# and Java If you have a collection which is not modified and that collection reference is shared between two threads what happens when you iterate on each thread?? ThreadA: Collection.iterator ThreadA: Collection.moveNext ThreadB: Collection.iterator ThreadB: Collection.moveNext Will threadB see the first element? Is the iterator always reset when it is requested? What happens if this is interleaved so movenext and item is interleaved? Is there a danger that you dont process all elements??

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  • method with two parameters which both need to be double dispatched

    - by mixm
    lets say i have a method which has two parameters. i have been implementing them as: if(aObj instance of Marble) { if(bObj instance of Bomb) { this.resolve((Marble)aObj,(Bomb)bObj); } } as you can see its not a very pretty solution. i plan to implement using double dispatching, but with two parameters which both need double dispatching, im afraid im a bit stumped. any ideas please. im implementing in java btw.

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  • Why is go language so slow?

    - by oraz
    As we can see from The Computer Language Benchmarks Game: go is in average 10x slower then C go is 3x slower then Java !? How it can be bearing in mind that go compiler produces native code for execution? Immature compilers for go? Or there is some intrinsic problem with the go language?

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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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  • 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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  • how to use jquery autocomplete?

    - by kyrogue
    hi, i am creating a web project using JSP, and is trying to implement a simple search for users from my database using jquery autocomplete, however i am having trouble understanding how it works. i have little to no knowledge on jquery and ajax just to let you know. i have done the following code and am stuck. <%@page contentType="text/html" pageEncoding="UTF-8" import="ewa.dbConnect,ewa.sendEmail,ewa.pwGen,ewa.hashPw,java.sql.*" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <link rel="stylesheet" type="text/css" href="css/jquery.autocomplete.css" /> <script src="js/jquery.autocomplete.js"></script> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title> </head> <body> <input type="text" id="search" name="search"/> <script> $("#search").autocomplete("getdata.jsp"); </script> </body> </html> <%@page contentType="text/html" pageEncoding="UTF-8" import="ewa.dbConnect,java.sql.*" %> <%! dbConnect db = new dbConnect(); %> <% String query = request.getParameter("q"); db.connect(); Statement stmt = db.getConnection().createStatement(); ResultSet rs = stmt.executeQuery("SELECT username FROM created_accounts WHERE username LIKE "+query); while(rs.next()) { out.println(rs.getString("username")); } db.disconnect %> if i am not wrong i read from a website, the parameter q is default and is just there, however how do i display the data? how do i pass the values from getdata.jsp into the autocomplete?

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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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