JDK proxy can't extend classes, you would need to Create a CGLib proxy. But I would recommend using this as the last resort when all your hopes with JDK proxy have ran out. Below is a sample code to create a CGLib proxy. Don't judge on the code as I had to remove lots of code before posting copyrighted code. User trace= (User) Enhancer.create(User.class, new MethodInterceptor(){ @Override public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable { long start = System.currentTimeMillis(); try{ return method.invoke(user, args); } finally { logger.debug(" TimeLog: Time taken in "+ (System.currentTimeMillis() - start)); } } });