Probleme avec le Hotswap de Javassist

[heavenkhn]

import java.io.*;
import com.sun.jdi.connect.IllegalConnectorArgumentsException;
import javassist.util.HotSwapper;
public class Test {
    public static void main(String[] args) {
        HotSwapper hs = null;
                    try {
                              hs = new HotSwapper(8000);
                    } catch (IOException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    } catch (IllegalConnectorArgumentsException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    }
        new HelloWorld().print();
        File newfile = new File("bin\\logging\\HelloWorld.class");
        byte[] bytes = new byte[(int)newfile.length()];
        try {
                              new FileInputStream(newfile).read(bytes);
                    } catch (FileNotFoundException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    } catch (IOException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    }
        System.out.println("** reload a logging version");
        HelloWorld hl = new HelloWorld();
        String name = hl.getClass().getName();
        System.out.println(name);
        hs.reload(name , bytes);
        new HelloWorld().print();
        newfile = new File("HelloWorld.class");
        bytes = new byte[(int)newfile.length()];
        try {
                              new FileInputStream(newfile).read(bytes);
                    } catch (FileNotFoundException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    } catch (IOException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    }
        System.out.println("** reload the original version");
        hs.reload("HelloWorld", bytes);
        new HelloWorld().print();
    }
}

et voila ce que sa donne dans eclipse:

Listening for transport dt_socket at address: 8000

hello world

** reload a logging version

HelloWorld

Exception in thread "HotSwap" java.lang.NoClassDefFoundError: class names do not match

          at com.sun.tools.jdi.VirtualMachineImpl.redefineClasses(VirtualMachineImpl.java:331)

          at javassist.util.HotSwapper.hotswap(HotSwapper.java:250)

          at javassist.util.HotSwapper$1.run(HotSwapper.java:224)

Exception in thread "main" java.lang.RuntimeException: failed to reload: HelloWorld

          at javassist.util.HotSwapper.reload2(HotSwapper.java:204)

          at javassist.util.HotSwapper.reload(HotSwapper.java:160)

          at Test.main(Test.java:38)

Sachant que Hello world a le code suivant :

 public class HelloWorld {
    public void print() {
        System.out.println("hello world");
        this.x=2;
    }
    public int x;
}

Pourquoi ces exceptions sont-ils apparus ???

Merci.