Reflect - 4 Proxy

public LoggingHandler(Object target) this.target = target;

Cache Method objects in a HashMap inside your handler to avoid repeated method.invoke() resolution. 7. Beyond JDK Proxies: CGLIB and Byte Buddy The JDK's reflect 4 proxy has one major limitation: it can only proxy interfaces . If you need to proxy a concrete class (without interfaces), you must use bytecode generation libraries. reflect 4 proxy

import java.lang.reflect.Proxy; public class Main public static void main(String[] args) RealUserService realService = new RealUserService(); public LoggingHandler(Object target) this

Whether you are building aspect-oriented programming (AOP) frameworks, mocking libraries (like Mockito), or intercepting method calls for logging and security, the reflect 4 proxy mechanism is your gateway to runtime metaprogramming. public LoggingHandler(Object target) this.target = target