How login after successfully register

[thiagu.m]

Hi every one
I am working on the login and registration module of my project.
I need to allow the user to login after successfully register.
This is my part of code from register session bean component.


   @In
        private TblUser user;

   @PersistenceContext
        private EntityManager em;

   @In
        private Identity identity;

public void register()
         {
          em.persist(user);

identity.setUsername(user.getUserName());
            identity.setPassword(user.getPassword());
            identity.login();
          
}


Here the identity.login() invoke the authenticate method from Authenticator component.
This is my sample code from  Authenticator.

  @Out(required=false, scope = SESSION)
  private TabUser user;

    @In
    Identity identity;
   
    @PersistenceContext
    private EntityManager em;

public boolean authenticate()
{
try
        {
            user = (TabUser)em.createQuery("from TabUser where userName = '"+identity.getUsername()+"'").getSingleResult();
            if(! user.getPassword().equals(identity.getPassword()))
            {
                 facesMessages.addToControl("password", "Invalid Password");
                return false;
            }
        }
        catch(NoResultException ex)
        {
             facesMessages.addToControl("password", "Invalid Username or Password");
            return false;
        }
        return true;
}


Here I face the problem is I cant login after successfully register.
It throws NoResultException exception.
If I try to login manually , it allow me to login.
I think the problem is EntityManager not getting flush after persist the user data into Tbluser table.
I try with em.flush() after persist the user data.
Still I got the same problem.
Any help to resole my problem