Generate an empty implementation of an interface in Java

Question

I am looking for a maven-plugin or just a library that can generate an empty implementation of an interface. Preferably I could pass an arbitrary interface:

public interface MyInterface {
    void doSomethingNice();
    long calculateSomething();
    boolean isSomethingValid();
    Object giveSomething();
}

And it would generate the following class:

public class MyInterfaceImpl implements MyInterface {
    @Override public void doSomethingNice() {}
    @Override public long calculateSomething() {return 0;}
    @Override public boolean isSomethingValid() {return false;}
    @Override public Object giveSomething() {return null;}
}

If such a maven-plugin existed, I would use it in generate-sources phase, to generate mocks and extend only those methods in which I need a specific mock-behavior. Anybody used something before?

Answer 1

I created a maven plugin and published it on github if anyone need it in the future:

https://github.com/himadri77/generate-default-impl-maven-plugin