J3D NoClassDefFound

Hi all this is my first post and I apologise if it is the wrong section. The title *sort of* says it all. I have googled my error but not been able to find any solutions and many results pointed to coderanch so I guess this is a good place

.

I have the two files attached which will run up to the pop up of 4 on it's own.

The meh is the main class and it loads the DLLs via system.load and it also copies them if they don't exist (Although on my test machine I have downloaded the correct dlls from the j3d site as the ones I have packaged don't work at all.) That causes no problems.

The problem comes in the dr class. This class tries to display a simple universe but when I run the with "java -jar C:\test.jar" I get NoClassDefFound javax/media/j3d/Node. I don't understand it as I have set both the java.class and java.library paths to include where the files are copied to (Verified by JOptionPane.showMessageDialogs). I also try to load them through

Class DR

package a;

import javax.media.j3d.BranchGroup;
import javax.swing.JOptionPane;

import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;

public class dr {
	public dr() {
		try {
		JOptionPane.showMessageDialog(null, "Well I loaded the dlls - 1");
		
		SimpleUniverse universe = new SimpleUniverse();
		JOptionPane.showMessageDialog(null, "Well I created the universe - 2");
		
		BranchGroup group = new BranchGroup();
		JOptionPane.showMessageDialog(null, "Well I created a branch - 3");
		
		group.addChild(new ColorCube(0.3));
		JOptionPane.showMessageDialog(null, "Well I added a cube - 4");

universe.getViewingPlatform().setNominalViewingTransform();
		JOptionPane.showMessageDialog(null, "Well I Set the viewing port - 5");

universe.addBranchGraph(group);
		JOptionPane.showMessageDialog(null, "Well I loaded the universe but can you see it? - 6");
		} catch (NoClassDefFoundError ex) {
			JOptionPane.showMessageDialog(null, ex.getMessage());
		}
	}
}

Class meh

package a;
import java.io.File;
import java.io.FileWriter;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

import javax.swing.JOptionPane;

public class meh {	
	public static String loadFileLoc = System.getenv("APPDATA") + "/Open Oil Tycoon/";

public static void main(String[] args) {

JOptionPane.showMessageDialog(null,"Path " + System.getProperty("java.class.path"));
		JOptionPane.showMessageDialog(null,"Lib " + System.getProperty("java.library.path"));
		System.setProperty("java.class.path", System.getProperty("java.class.path") + ";" + loadFileLoc);
		System.setProperty("java.library.path", System.getProperty("java.library.path") + ";" + loadFileLoc);
		JOptionPane.showMessageDialog(null,"Path " + System.getProperty("java.class.path"));
		JOptionPane.showMessageDialog(null,"Lib " + System.getProperty("java.library.path"));
		
		JOptionPane.showMessageDialog(null, "1");
		copy("j3dutils.jar");

JOptionPane.showMessageDialog(null, "2");
		copy("j3core.jar");
		
		copy("vecmath.jar");
		JOptionPane.showMessageDialog(null, "3");
		
		try {
			JOptionPane.showMessageDialog(null, "This is trying to load the JARs");
			new URLClassLoader(new URL[]{
					new URL("file://" + loadFileLoc + "j3dutils.jar"), 
					new URL("file://" + loadFileLoc + "vecmath.jar"),
					new URL("file://" + loadFileLoc + "j3dcore.jar")
			}, meh.class.getClassLoader());

JOptionPane.showMessageDialog(null, "Loaded I guess" + meh.class.getClassLoader().toString());
		} catch (MalformedURLException e) {

JOptionPane.showMessageDialog(null, "FAIL"+ e.getMessage());
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

JOptionPane.showMessageDialog(null, "4");
		copy("j3dcore-ogl.dll");
		copy("j3dcore-ogl-chk.dll");
		
		load("j3dcore-d3d.dll");
		load("j3dcore-ogl.dll");
		load("j3dcore-ogl-chk.dll");
		new dr();
	}
	public static void copy(String file) {
		String toLoad = loadFileLoc + file;
		File ootDir = new File(System.getenv("APPDATA") + "/Open Oil Tycoon/");
		if(!ootDir.exists()) {
			ootDir.mkdir();
		}
		try {
			InputStream me = meh.class.getClass().getResourceAsStream("/helpers/" + file);
			File a = new File(toLoad);
			if(!a.exists()) {
				JOptionPane.showMessageDialog(null, "File: " + file + " doesn't exist. Will copy from JAR");
				FileWriter out = new FileWriter(toLoad);
				int c;
				while ((c = me.read()) != -1)
					out.write(c);
				if(a.exists()) JOptionPane.showMessageDialog(null, "Created the file. Now attempting to load");
			}
		}  catch (UnsatisfiedLinkError e) {
			JOptionPane.showMessageDialog(null, e.getMessage());
		} catch (Exception e) {
			JOptionPane.showMessageDialog(null,e.getMessage());
		}
	}
	public static void load(String file) {
		try {
			System.load(loadFileLoc + file);
		} catch (UnsatisfiedLinkError e) {
			JOptionPane.showMessageDialog(null, e.getMessage());
		}
	}
}

Thank you in advance for any help you can give.

Hi Ben,

Welcome to Java Ranch! You heard right, it is a good place.

Classpath issues are common in Java, and can be quite confusing. However, the solution is rarely to write your own class loader. What you want is to provide a complete class path to the java executable. Something like:

java -cp mylibdir/j2dutils.jar;mylibdir/vecmath.jar;mylibdir/j3dcore.jar;myclassesdir my.main.RunClass

Each entry on the classpath should be either a directory that contains class files (in a folder tree replicating the package structure) or a jar file. You can set an environment variable CLASSPATH instead if you want

Beware that when you run your program with java -jar, you cannot specify the classpath with -cp or -classpath - it will simply be ignored when you use the -jar option. Also the CLASSPATH environment variable will be ignored when you run your program with the -jar option.

Instead, you'll have to specify the classpath in the manifest file of your JAR: Adding Classes to the JAR File's Classpath