This is related to Java 8 defender methods support.

Consider following code:

public class DefenderMethods {
	interface A {
		default void doSomething() {
		}
	}
	interface B {
		default void doSomething() {
		}
	}
	class C implements A, B {
	}
}


NetBeans shows standard javac error on class C: class inherits unrelated defaults from type A and B.

It would be great to have a action (or hint? not sure about the name) with this error to override the method, similar to one we see when extending abstract class.