Any example of dynamic proxy with RMI?

Question

Hi, are there any good example of dynamic proxy with RMI, using the new RemoteObjectInvocationHandler class?
I am currently implementing a Registry, and want to use dynamic proxy to wrap around the registry stub, to pass extra information to the client.
I've tried it, but the program will hang and get this exception:
Exception in thread "RMI TCP Connection(1616)-192.168.1.23" java.lang.OutOfMemoryError: Java heap space
My implementation looks like this:
public RegistryImpl extends RemoteServer Implements Registry {
    public RegistryImpl(int port, Properties... properties) throws RemoteException, ChannelException {
         // Create a reference for the registry.
     LiveRef liveref = new LiveRef(id, port);
        ref = new UnicastServerRef(liveref);
         Registry proxy = (Registry)RegistryProxy.newProxyInstance(
              this.getClass().getClassLoader(),
              this.getClass().getInterfaces(),
              new RemoteObjectInvocationHandler(this.getRef()));
         /* Using dynamic proxy */
         usref.exportObject(proxy, null, true);
public class RegistryProxy extends Proxy implements Registry {
     private InvocationHandler handler;
     public RegistryProxy(InvocationHandler handler) {
          super(handler);
          this.handler = handler;
     public Remote lookup(String name) throws RemoteException, NotBoundException, AccessException {
          Remote result;
          try {
               Method m = Registry.class.getMethod("lookup", new Class[]{String.class});
               result = (Remote)handler.invoke(this, m, new Object[]{name});
          } catch (SecurityException e) {
               throw new UndeclaredThrowableException(e);
          } catch (NoSuchMethodException e) {
               throw new UndeclaredThrowableException(e);
          } catch (Throwable e) {
               throw new UndeclaredThrowableException(e);
          return result;
     public void bind(String name, Remote remoteObj) throws RemoteException, AlreadyBoundException, AccessException {
     public void unbind(String name) throws RemoteException, NotBoundException, AccessException {
     public void rebind(String name, Remote remoteObj) throws RemoteException, AccessException {
     public String[] list() throws RemoteException, AccessException {
}I am new to Java programming, any help is appriciated.
Regards
Eddie

Answer 1

Hi Eddie,
Perhaps you might like this one:
http://wiki.java.net/bin/view/Communications/TransparentProxy
it uses dynamic proxies to achieve complete RMI transparency.
Something to consider, good luck.
John