Is there an error in EJB ql? method returning void - should be int

Question

Hi, I have this problem.
I am trying to return a value of type int, but when i call it, i get an error void expected. Any idea where i am wrong?
Thanks in advance
---call method----------
int q;
q = lookupClientFacade().UserId(username);
---Method------------
public int UserId(String username) {
//Id integer value of user is found according to username
// input String username
//output Integer id
//q = null;
Integer q = null;
q = (Integer) em.createQuery("SELECT c.cNo from CLIENT WHERE c.cUserName = :sessionName")
.setParameter("sessionName",username).getSingleResult();
// convert type Integer to int
int i = 1;;
i = q.intValue();
return i;
}

Answer 1

This is the exact error.
found : void
required: int
q = lookupClientFacade().UserId(username);
1 error