ClassCastException while building the SessionFactory

rkg · **Joined:** Wed Aug 30, 2006 1:19 pm **Posts:** 2

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I started working on Hibernate recently and I tried the tutorials from Hibernate website. they worked.
I am getting a classcastexception when building the SessionFactory. The classes and mapping documents are generated using Hibernate reverse Engineering tool. I created a class with main and trying to access the database. I have 5 mapping documents generated by reverse engineering. I tried to find any info for this error on the web and could not find any. if I run the project without the mapping files I don't get any error, but when the mapping files are added i get the classcastexception.

Any help from Hibernate gurus are greatly appreciated. If necessary I will post the cfg.xml file and mapping files.
Thanks...

Hibernate version:
3.1
Mapping documents:

Code between sessionFactory.openSession() and session.close():
sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
//Session session = HibernateUtil.getSessionFactory().getCurrentSession();
Session session = sessionFactory.getCurrentSession();

if (session != null) {
session.beginTransaction();
List results = session.createQuery("from EdpmattributeType").list();
if (results.size() > 0) {
for (int i = 0; i < results.size(); i++) {
EdpmattributeType attrType = (EdpmattributeType) results.get(i);
System.out.println("******************OUTPUT************");
System.out.println("AttributeId " + attrType.getAttrTypeId() +
" Attribute name: " + attrType.getAttrTypeId());
}
}
session.getTransaction().commit();
//HibernateUtil.getSessionFactory().close();
sessionFactory.close();
}
Full stack trace of any exception that occurs:
Building SessionFactory failed.java.lang.ClassCastException
java.lang.ExceptionInInitializerError
at edpm.RepositoryTest.main(RepositoryTest.java:42)
Caused by: java.lang.ClassCastException
at org.hibernate.tuple.PropertyFactory.buildVersionProperty(PropertyFactory.java:83)
at org.hibernate.tuple.EntityMetamodel.<init>(EntityMetamodel.java:157)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:412)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:108)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:216)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1176)
at edpm.RepositoryTest.main(RepositoryTest.java:18)
Exception in thread "main"
Name and version of the database you are using:
SQL Server 2000
The generated SQL (show_sql=true):

Debug level Hibernate log excerpt:

Problems with Session and transaction handling?

Read this: http://hibernate.org/42.html

Code:

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

//import com.hibernate.src.EdpmattributeType;
//import com.hibernate.src.HibernateUtil;

public class RepositoryTest {
   private static final long serialVersionUID = 1L;
   private static SessionFactory sessionFactory = null;
   
   public static void main(String[] args) {
      try {
         sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
         //Session session = HibernateUtil.getSessionFactory().getCurrentSession();
         Session session = sessionFactory.getCurrentSession();

      if (session != null) {
        session.beginTransaction();
      List results = session.createQuery("from EdpmattributeType").list();
         if (results.size() > 0) {
               for (int i = 0; i < results.size(); i++) {
                      EdpmattributeType attrType = (EdpmattributeType) results.get(i);
                      System.out.println("******************OUTPUT************");
                      System.out.println("AttributeId " + attrType.getAttrTypeId() +
                                         " Attribute name: " + attrType.getAttrTypeId());
                  }
         }
         session.getTransaction().commit();
          //HibernateUtil.getSessionFactory().close();
         sessionFactory.close();
      }   
         
      }catch (Throwable ex) {
         //log.error("Building session factory failed.", ex);
          // Make sure you log the exception, as it might be swallowed
            System.err.println("Building SessionFactory failed." + ex);
            throw new ExceptionInInitializerError(ex);
        
         //throw new ExceptionInInitializerError(ex);
      }
      
   }
}

rkg · **Joined:** Wed Aug 30, 2006 1:19 pm **Posts:** 2

This is fixed -
The problem is if the mapping file and class definitions were not matching.
I have a column called "Version" in my database and when I did the reverse engineering this version field was created <version/> tag instead of <property/> tag. this was causing the problem.

When dealing with mappings one extra pair of eyes are really necessary I believe.

I am posting this solution just in case if some one is looking for a solution and wasting days looking for it.
thanks...