I have had this problem for a month now. I am trying to execute a JPA query
from a session bean, and everytime it returns only null. Other functionalities
of the entity bean like persist() works, and stores database. What am i doing
wrong here. My code is attached below:
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
@Stateless
public class LoginBean implements LoginBeanRemote, LoginBeanLocal {
public LoginBean() {
}
@PersistenceContext(unitName="CustomerUnit")
EntityManager manager;
public String validateLogin(String userName, String password)
{
try
{
Query q1 = manager.createQuery("SELECT c FROM Customer c WHERE
c.userName = :username AND c.password = :password ");
q1.setParameter("username", userName);
q1.setParameter("password", password);
System.out.println(q1.getSingleResult());
}
catch(Exception e)
{
e.printStackTrace();
}
return "loginUser";
}
}
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