I'm creating proxies with javassist ProxyFactory. When creating a single proxy all works fine.

However, when I pass a proxied class to the proxying mechanism, it fails with

javassist.bytecode.DuplicateMemberException: duplicate method: setHandler in com.mypackage.Bean_$$_javassist_0_$$_javassist_1

I'm creating the proxies with this:

public Object createProxiedInstance(Object originalInstance) throws Exception {
    Class<?> originalClass = instance.getClass();
    ProxyFactory factory = new ProxyFactory();

    factory.setSuperclass(originalClass);

    factory.setHandler(new MethodHandler() {..});
    Class<T> proxyClass = factory.createClass();

    return proxyClass.newInstance();
}

So, how do I create proxies of proxies?

Update: The actual problems is that each proxy implements the ProxyObject which defines setHandler(..) method. So the 2nd proxy is trying to redefine the method, instead of overriding it in the subclass.