Custom URLClassLoader, NoClassDefFoundError when run

Question

I\'ve created my own URLClassLoader, and set it as the system classloader via java.system.class.loader. It\'s initialized and everything, but the clas

Answer 1

It's visible from a (few) mile(s) away you are not using the custom classloader beside Class.forName

The ClassNoDefFoundError occurs since the classloader that has loaded current class MyProgram attempts to load org.eclipse.swt.graphics.Point.

You need to load another class (call it launcher) via Class.forName and then start from there - implement some interface (even runnable will do) and call it.

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edit

How to do it, a simplistic scenario.
1. Create another class called mp.loader.Launcher that implements Runnable like that.

public class Launcher implements Runnable{
public void run(){
  org.eclipse.swt.graphics.Point pt = new org.eclipse.swt.graphics.Point(0, 0);
  //whatever, start from here.
}
}

2. Place it in another jar called swt-loader.jar.

in MyProgram class use:

loader.addJarToClasspath("swt-loader.jar");
Runnable r = (Runnable) Class.forName("mp.loader.Launcher", true, loader);
r.run();//there you have