javax.persistence.NoResultException: getSingleResult() did not retrieve any entities
- by apple1988
Hello,
i have created a namedquery with ejb to check if the username is used.
When the singleResult is null, then i get the following Exception :
javax.persistence.NoResultException: getSingleResult() did not retrieve any entities
But this exception is the result that i want when the username is free. ^^
Here is the code:
public User getUserByUsername(String username) throws DAOException{
try{
Query q = em.createNamedQuery(User.getUserByUsername);
q.setParameter("username", username);
return (User) q.getSingleResult();
}catch(Exception e){
throwException(username, e);
return null;
}
}
Does anybody know what the problem is. :(
I will return null andy don`t get an Exception.
Thank you very much
