Question

I am on a Mac running Netbeans 6.9.
I downloaded and installed LWJGL using this tutorial down to the letter:
http://lwjgl.org/wiki/index.php?title=Setting_Up_LWJGL_with_NetBeans

I finished the installation and copied sample code to see if my system is working. I got a bug, and was not sure if it was because of faulty code or I was doing something wrong. So I shortened down the code to this little simple bit:

package javaopengl;

import org.lwjgl.Sys;
import org.lwjgl.opengl.Display;

//Testing

public class Main {

    public static void main(String[] args) {
        boolean fullscreen = (args.length == 1 && args[0].equals("-fullscreen"));

        try {
            Display.create();
            Display.destroy();
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }
        System.exit(0);
    }
}

But I still get the same error:

run:
Exception in thread "main" java.lang.NoClassDefFoundError: =
Caused by: java.lang.ClassNotFoundException: =
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

I am not sure what exactly is going on, Would you please tell me what is going on and how to fix it?

Note: When i am looking at the text in the development environment, it does not show those red lines indicating there are any errors.

Answer 1

What are you typing (or what is netbeans running) to run this? Since the Mac filesystem is fairly case-agnostic unless you’ve specified otherwise, running java javaopengl.main will look for a file main.java, which is there (Main.java will be returned). But the class is Main, and you can get this exception from the difference. If this is being run from an ant script, I suggest making sure you have the correct capitalization (the class should be javaopengl.Main). A simple way to test this is to delete everything except the class definition and an empty public static void main(String[] args) {}

Alternatively, you could have something simpler, like your classpath out of whack. Missing the lwjgl jar would get you there, but if you followed the directions in that tutorial, that actually seems less likely. Still, you can test this.

package javaopengl;

public class Main {
  public static void main(String[] args) {
    System.out.println("well, main works");
    Class checkjar = Class.forName("org.lwjgl.opengl.Display");
    System.out.println("My ClassLoader found: " + checkjar.getCanonicalName());
  }
}

Also, remove import org.lwjgl.Sys; from your shortened example. It doesn’t appear to be needed, provided it isn’t the source of your problems :).