Dynamic proxy (clientside) for EJBObject

Question

I ran into some ClassNotFoundException when using dynamic proxy.
Can anyone shed some light? I am running weblogic workshop 8.1 beta.
Here is the code and exception stack trace:
session bean code:
public VPNIf makeProxy(){
ClassLoader ejbcl =
ctx.getEJBObject().getClass().getClassLoader();
     try {
Class cs = Class.forName(VPNIf.class.getName(), true,
ejbcl);
     VPNIf obj = (VPNIf)VProxy.createProxy(ejbcl, new Class[]{cs});
obj.setBandwidth(15);
return obj;
} catch (Exception ex){
ex.printStackTrace();
return null;
VProxy class packaged with the bean:
public class VProxy implements InvocationHandler, Serializable {
private Map m_map;
public static Object createProxy(ClassLoader cl, Class[] interfaces)
try {
     Class proxyedClass = Class.forName(VProxy.class.getName(), true, cl);
InvocationHandler ih =
(InvocationHandler)proxyedClass.newInstance();
     return Proxy.newProxyInstance(cl, interfaces, ih);
} catch (Exception ex){
ex.printStackTrace();
return null;
VPNIf with the bean:
public interface VPNIf extends Serializable {
public void setBandwidth(int x);
public int getBandwidth();
Client code:
Method method =
sessionObject.getClass().getMethod("makeProxy", null);
Class proxyedIf = method.getReturnType();
Class x = Class.forName("org.openuri.VPNIf", true,
proxyedIf.getClassLoader()); // this line works fine
Method method1 = proxyedIf.getMethod("getBandwidth", null);
Object proxy = method.invoke(sessionObject, null); //
Exception here
method = proxyedIf.getMethod("getBandwidth", null);
Integer bw = (Integer)method.invoke(proxy, null);
System.out.println("bandwidth: " + bw);
Here is the exception on client side:
Caused by: java.rmi.UnmarshalException: failed to unmarshal interface
org.openuri.VPNIf; nested exception is:
     java.lang.ClassNotFoundException: org.openuri.VPNIf
     at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:163)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:285)
     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:244)
     at org.openuri.VPNServiceBean_9khl0e_EOImpl_WLStub.makeProxy(Unknown
Source)
     ... 21 more
Caused by: java.lang.ClassNotFoundException: org.openuri.VPNIf
     at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:217)
     at java.io.ObjectInputStream.resolveProxyClass(ObjectInputStream.java:630)
     at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1469)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1432)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
     at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:111)
     at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:95)
     at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:56)
     at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:159)

Answer 1

Greetings,
Say i have a servlet named "DispatcherServlet",
let", how should i go about to implement a
dynamic proxy class for the same? Depends on your application requirements and what you want to proxy to and where. Can you be more specific?
Thanks
SamRegards,
Tony "Vee Schade" Cook