👀 Views: 50 💬 Answers: 1 📅 Created: 2025-08-23

java reflection proxy Java

Does anyone know how to I keep running into I've looked through the documentation and I'm still confused about I'm working with a question when trying to create a dynamic proxy for an interface that includes default methods in Java 17. My implementation worked fine for interfaces without default methods, but now I'm getting a `java.lang.IllegalArgumentException: interface com.example.MyInterface is not an interface` behavior when I try to get a proxy instance. Here’s the code I’m using: ```java import java.lang.reflect.Proxy; public class ProxyExample { public static void main(String[] args) { MyInterface proxyInstance = (MyInterface) Proxy.newProxyInstance( MyInterface.class.getClassLoader(), new Class<?>[]{MyInterface.class}, (proxy, method, methodArgs) -> { System.out.println("Method called: " + method.getName()); return null; } ); proxyInstance.defaultMethod(); // Should call default method } } interface MyInterface { default void defaultMethod() { System.out.println("Default method executed!"); } } ``` When I run this, I get the IllegalArgumentException. I’ve double-checked the interface and confirmed that it is indeed an interface. I also tried using a custom class loader, but that didn't solve the question. My goal is to create a proxy that can intercept calls to both default and abstract methods. Is there something I’m missing or is this a known limitation in the dynamic proxy mechanism with default methods? My development environment is Windows. Any ideas what could be causing this? I'd really appreciate any guidance on this.