annotating methods in implementation classes or interfaces?

Question

I am using Java1.7 and spring3.

I have below classes.

MyInterface.java

public interface MyInterface{

  String getResult();

}

MyInterfaceImpl.java

public class MyInterfaceImpl implements MyInterface{

  @MyCustomAnnotation
  public String getResult(){
  //some logic

   }

}

I annotated method in Impl class. Is it good practice to annotate methods in implementation class? Or do i need to annotate methods in the interface itself?

Thanks!

Answer 1

Classes don't inherit the annotation from interfaces, so you should be really careful using annotations on interfaces.

Here is an example of what can happen if you are not careful:

http://kim.saabye-pedersen.org/2013/05/spring-annotation-on-interface-or-class.html