Java8 dynamic proxy and default methods

Question

Having a dynamic proxy for an interface with default methods, how do I invoke a default method? By using something like defaultmethod.invoke(this, ...) you just

Answer 1

You can use the MethodHandles type in your InvocationHandler. This code is copied from Zero Turnaround.

Constructor constructor;
Class declaringClass;
Object result;

if (method.isDefault()) {
   declaringClass = method.getDeclaringClass();
   constructor = MethodHandles.Lookup.class.getDeclaredConstructor(Class.class, int.class);

   constructor.setAccessible(true);

   result = constructor.
      newInstance(declaringClass, MethodHandles.Lookup.PRIVATE).
      unreflectSpecial(method, declaringClass).
      bindTo(proxy).
      invokeWithArguments(args);

   return(result);
}