Personally I think that leaving a return statement at the end of a method whether you need one or not lets everyone know you really did mean to end the method there.

* assign an interview to a person
* @param personId
* @param interviewName
public void assign(
@WebParam(name = "personId") String personId,
@WebParam(name = "interviewName") String interviewName
InterviewEngine.assign(em, personId, interviewName);

In other words, "Yes kids, I did mean to return there, no I didn't nod off and forget to finish the method."