Groups > comp.lang.java.programmer > #11850

Re: Dynamic method invocation on Proxy object?

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From	Steven Simpson <ss@domain.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Dynamic method invocation on Proxy object?
Date	Wed, 08 Feb 2012 10:34:25 +0000
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On 08/02/12 08:19, Sebastian wrote:
> However, when delegate is itself a proxy, then delegate.getClass() 
> will give me Proxy,

Are you sure?  I get $Proxy0 from this:

import java.lang.reflect.*;

public class GetProxyClass {
     public static void main(String[] args) throws Exception {
         ClassLoader classLoader =
             ClassLoader.getSystemClassLoader();
         InvocationHandler behaviour = new InvocationHandler() {
                 public Object invoke(Object proxy, Method method,
                                      Object[] args) {
                     System.out.println("Called " + method);
                     return null;
                 }
             };
         Object proxy =
             Proxy.newProxyInstance(classLoader,
                                    new Class<?>[] { Runnable.class },
                                    behaviour);
         Class<?>  proxyClass = proxy.getClass();
         System.out.println("Proxy class is: " + proxyClass);

         Method m = proxyClass.getMethod("run", new Class<?>[0]);
         ((Runnable) proxy).run();
         m.invoke(proxy);
     }
}

Output:

Proxy class is: class $Proxy0
Called public abstract void java.lang.Runnable.run()
Called public abstract void java.lang.Runnable.run()

It also demonstrates a method on the implemented interface being looked 
up and invoked.

-- 
ss at comp dot lancs dot ac dot uk

Thread

Dynamic method invocation on Proxy object? Sebastian <sebastian@undisclosed.invalid> - 2012-02-08 09:19 +0100
  Re: Dynamic method invocation on Proxy object? Steven Simpson <ss@domain.invalid> - 2012-02-08 10:34 +0000
    Re: Dynamic method invocation on Proxy object? Sebastian <sebastian@undisclosed.invalid> - 2012-02-08 15:16 +0100

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