Hi to all, I\'m tring to understand how create and use dynamic proxies in JAVA.

Question

Hi to all,

I'm tring to understand how create and use dynamic proxies in JAVA. I'm using Eclipse for write the code and as school exercice I must create proxies with the JAVA library as this link: http://commons.apache.org/proxy/ .

I read that proxies can make classes that can be an interface for the communication between other classes. Unfortunately I do not undersood how start create the first proxy class. I've made a really banal program with the classes main, client and server. The main initializes tho objects, one declared as client and one as server. Calls on the client object a method that generate a integer random number, catchs it and pass it to the server object, invoking a method that return the banal operation number*number, where number is the numbr passed to the server.
At this point, I would create communication between these classes by a proxy object.

I've seen that in commons proxy library it can have 3 kind of proxies: delegator, invoker and interceptor. For starting I've taken the definition of the method (one of the two) that permits to declare a delegator proxy.

createDelegatorProxy(ClassLoader classLoader, ObjectProvider delegateProvider, Class[] proxyClasses)

So I've created a ProxyFactory object and I'm tring to call on it createDelegatorProxy method, but I haven't idea of what ClassLoader, ObjectProvider and Class[] (array) arguments pass to it.

So I start think that there are some things that I cannot see under the proxy logic and search examples online for understand the usage of this library, but I do not found anything.

I really need an example that shows me all steps I must do to create a working proxy in this library. After that I think to be ready for do exercices and tests to study in deep this argument.
Eventually for others questions I wll open new topics.

Thanks very much.

Explanation / Answer

Dear... Am giving you the sample code for Create proxies with apache commons proxy library: package org.apache.commons.proxy; import java.lang.reflect.InvocationHandler; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public interface ProxyFactory public class ProxyFactory { public boolean canProxy( Class[] proxyClasses ) { for( int i = 0; i

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