hibernate3.jar in client-side classpath?

smathy · **Joined:** Tue May 03, 2005 11:53 am **Posts:** 7

Hello,
I've a swing client that make calls to session bean on a JEE server (jonas).
On my client I've this error:

Code:

java.rmi.UnmarshalException: ClassNotFoundException unmarshalling returnjava.lang.ClassNotFoundException: org.hibernate.collection.PersistentSet (no security manager: RMI class loader disabled)
   at org.objectweb.carol.rmi.jrmp.server.JUnicastRef.invoke(JUnicastRef.java:178)
   at test.interfaces.JOnASAdminSession739595833Remote_Stub.getAllUsers(Unknown Source)

Here is my session bean code:

Code:

public Collection getAllUsers() throws BusinessException {
      Collection users = null;
      try {
         init();
         session.connect();
         users = userDAO.findAll();
      } finally {
         session.disconnect();
      }
      return users;
   }

And here is my dao code:

Code:

   public Collection findAll() throws InfrastructureException {
      Collection users;
      try {
         users = session.createCriteria(User.class).list();
      } catch (HibernateException ex) {
         throw new InfrastructureException(ex);
      }
      return users;
   }

If I put the hibernate3.jar in the client's classpath all work fine.
Is there a way to avoid to put this jar on the client?

Thanks in advance.

steckemetz · **Posted:** Thu Aug 11, 2005 4:13 am

Looks like you are using PersistentSet
in your classes. If you transport them to
the client you certainly need hibernate.jar.
If you do not want that dependency, you
need to use java.util.HashSet and so on
as collection classes.

Basilio · **Posted:** Thu Aug 11, 2005 4:35 pm

I suggest you rethink your approach if possible and use transfer objects instead. Do no use POJOs to trasport data to a client. Or your client can become very "fat". Hibernate behind scene can use own implementations behind interfaces that you will be using for data access.

smathy · **Joined:** Tue May 03, 2005 11:53 am **Posts:** 7

thank for your replies.
I going to rethink the architecture of my program but I'm new in hibernate.
But I don't undertand anyway my error. I've modified the code of my DAO :

Code:

public Collection findAll() throws InfrastructureException {
      Collection users;
      try {
         users = new ArrayList(session.createCriteria(User.class).list());
      } catch (HibernateException ex) {
         throw new InfrastructureException(ex);
      }
      return users;
}

So my DAO return an ArrayList, but I've the same error!
I think it should be possible to have a heavy client whitout the hibernate.jar? Any experiences?

Thanks.

kgignatyev · **Posted:** Thu Aug 11, 2005 5:27 pm

Does your User object holds any persistent collections by any chance? If so then you will need to convert them to standard Java collections too.

Basilio · **Posted:** Thu Aug 11, 2005 7:01 pm

Your user object can reference other objects. Those objects can reference others and so on .... You can have trouble not with user itself but with associated objects. It depends how you have mapped all of that. If you provide your mappings then it may be possible to say where source of problem.