Memory leak org/hibernate/engine/StatefulPersistenceContext

[David M]

We have a lot of OutOfMemory error in our application
After analyzing the JVM, we supsect some MemoryLeak due to org/hibernate/engine/StatefulPersistenceContext.
We are using:
-Websphere 6.1 + Spring Hibernate 3.0.1.RELEASE-A + Hibernate 3.2.7.ga

SessionFactory:class="org.springframework.orm.hibe rnate3.LocalSessionFactoryBean"
transactionManager:class="org.springframework.tran saction.jta.JtaTransactionManager"
in our DAO:
public class xxxDaoImpl extends BaseDao {
public void createXXX(Object obj) throws DataAccessException {
this.getHibernateTemplate().saveOrUpdate(obj);
etc....

I turned the debug on and we got something like:
2011-02-10 13:40:34,024 | DEBUG | org.springframework.orm.hibernate3.SessionFactoryU tils - Opening Hibernate Session
2011-02-10 13:40:34,024 | DEBUG | org.springframework.orm.hibernate3.SessionFactoryU tils - Registering Spring transaction synchronization for new Hibernate Session
2011-02-10 13:40:34,024 | DEBUG | org.springframework.orm.hibernate3.HibernateTempla te - Found thread-bound Session for HibernateTemplate
2011-02-10 13:40:34,029 | DEBUG | org.springframework.orm.hibernate3.HibernateTempla te - Not closing pre-bound Hibernate Session after HibernateTemplate
etc.....
2011-02-10 13:40:34,045 | DEBUG | org.springframework.orm.hibernate3.SessionFactoryU tils - Closing Hibernate Session
2011-02-10 13:40:34,045 | DEBUG | org.springframework.orm.hibernate3.SessionFactoryU tils - Opening Hibernate Session


Can you help me please on how to optimize spring/hibernate sessions?
How can i flush/close session if Spring JTA manager is not doing the job?

Do you have any ideas?

Thanks