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ClassCastException with uniqueResult

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heidi

Post subject: ClassCastException with uniqueResult

Posted: Wed Sep 24, 2008 4:54 am

Newbie

Joined: Wed Sep 24, 2008 4:39 am
Posts: 3

Hi Folks,

I'm new on the topic Hibernate and I have got a problem.
I've got a criteria on by database and i want to get a String with the help of uniqueResult. But I always get a ClassCastException and I do not know how to solve my Problem. Here my Code:

Code:

public static String getMitarbeiterId(String projektId, String projekt) {
        Session session = HibernateUtil.getCurrentSession();
        Criteria c = session.createCriteria(ProjektPlaner.class);
        c.add(Restrictions.eq("id", projektId));
        c.add(Restrictions.eq("projekt", projekt));
        c.add(Restrictions.eq("planer", Boolean.TRUE));
        c.setMaxResults(1);
       
        return (String) c.uniqueResult();
       
       
    } 

Thanks for help.

heidi

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kalgon

Post subject:

Posted: Wed Sep 24, 2008 5:19 am

Beginner

Joined: Mon Jul 05, 2004 9:29 am
Posts: 38

the return value of uniqueResult() will be of type ProjektPlaner and not String:

Code:

return (ProjektPlaner) c.uniqueResult();

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heidi

Post subject:

Posted: Wed Sep 24, 2008 5:23 am

Newbie

Joined: Wed Sep 24, 2008 4:39 am
Posts: 3

And how can I cast it to a String then?

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kalgon

Post subject:

Posted: Wed Sep 24, 2008 5:37 am

Beginner

Joined: Mon Jul 05, 2004 9:29 am
Posts: 38

what is it you want to return? a property from ProjektPlanner?

Code:

ProjektPlanner planner = (ProjektPlanner) c.uniqueResult();
return planner == null ? null : planner.getMyPropertyWhichIsAString();

but I don't think it is really efficient to do it that way: if later you need something else from ProjektPlanner, will you add a second method for that property? why not just return the ProjektPlanner and let the caller take what it needs from it.

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