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  1. #1
    Psyclone is offline Member
    Join Date
    Jan 2010
    Rep Power

    Default java.lang.NoClassDefFoundError

    I've been writing code for about a month and have run into this problem a couple times but seemed to have found a way around it until now.

    All of a sudden, any project I compile gives me
    java.lang.ClassNotFoundException: gameinterface.Main errors.

    The build is successful, but when I try to run the program from NetBeans, I get the following error:

    Java Code:
    java.lang.NoClassDefFoundError: gameinterface/Main
    Caused by: java.lang.ClassNotFoundException: gameinterface.Main
            at Method)
            at java.lang.ClassLoader.loadClass(
            at sun.misc.Launcher$AppClassLoader.loadClass(
            at java.lang.ClassLoader.loadClass(
            at java.lang.ClassLoader.loadClassInternal(
    Could not find the main class: gameinterface.Main.  Program will exit.
    Exception in thread "main" Java Result: 1
    BUILD SUCCESSFUL (total time: 1 second)
    I think I resolved this in the past by making a new project and copy/pasting the code. I know this is not the correct way to resolve the problem though.

    I researched this problem a lot and it seems it has something to do with the CLASSPATH. I can't even find where to change the classpath in NetBeans though.

    I tried using the HELP function in NetBeans which suggests:

    To declare the classpath for a project:

    1) Build the project so that all of the project's build outputs (JAR files and WAR files) exist on your computer.

    2) In the Projects window, right-click the project node and choose Properties.

    3) Click Classpath in the right panel of the Project Properties dialog box.

    The Project Properties - GameInterface window comes up, but there is no mention of Classpath anywhere.

    What am I doing wrong?

  2. #2
    Psyclone is offline Member
    Join Date
    Jan 2010
    Rep Power



    I once again created a new project and it works perfectly fine. Clean and Build, then Run. No problems whatsoever. I compared the project properties and everything looks exactly the same.

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