ClassCastException while inserting record using Hibernate

[Pranav Pal]

I have UserDomain class corresponding to table user_domain and having fields userId and domainId.

In a function I have following code:

   
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
QuestionDomain question_domain = new QuestionDomain();
question_domain.setDomainId(domainId);  question_domain.setQuestionId(questionId);
session.save(question_domain);
tx.commit();

When I run this code, passing questionId and doaminId as arguments to the function, I am getting exception
java.lang.ClassCastException: java.lang.String
at this line:

 session.save(question_domain);   

What can be the reason for this exception?

Thanks in advance

[ May 19, 2008: Message edited by: Pranav Pal ]

[ May 19, 2008: Message edited by: Pranav Pal ]
[ May 19, 2008: Message edited by: Pranav Pal ]

[Mark Spritzler]

What are the id types in Java and what hibernate types do you have in your mapping for those ids? Sounds like in one case it is a String and another it is a long or an int.

Mark