private Factory createMock() throws Exception { final MethodInterceptor interceptor = new MethodInterceptor() { public Object intercept( final Object obj, final Method method, final Object[] args, final MethodProxy proxy) throws Throwable { return proxy.invokeSuper(obj, args); } }; final Enhancer enhancer = new Enhancer(); enhancer.setSuperclass(ArrayList.class); enhancer.setCallbackType(MethodInterceptor.class); final Class<?> mockClass = enhancer.createClass(); Enhancer.registerCallbacks(mockClass, new Callback[] {interceptor}); final Factory f = (Factory) ClassInstantiatorFactory.getInstantiator().newInstance(mockClass); f.getCallback(0); return f; }