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

[Marten Deinum]

Please use [ code][/code ] tags when posting code/stacktraces etc. that way it remains readable.

HibernateTemplate isn't closing the session because it was already bound... The logging says nothing about the tx manager, you also see the closing of the hibernate session. In general the outofmemories are caused by either
1. Improper transactionmanagement or setup
2. Reading/processing a lot of data without calling flush and clear which eats up the memory

Also please post your configuration as that might be informative, especially the hibernate and tx stuff.

[David M]

Thanks for your reply

1. Improper transactionmanagement or setup
- How can i be sure that i have a proper transactionmanagement?

2. Reading/processing a lot of data without calling flush and clear which eats up the memory
How can i flush/clear hibernate session, as i am not referring this session in any place of my code.
I am using HibernateTemplate, and this one get the session from SessionFactory


SPRING 3.0.1.RELEASE-A
HIBERNATE 3.2.7.GA

my AppContext.xml file:
<bean id="mySessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property
name="mappingResources"><list><value>com/xxx/yyy/model/domain/hibernate/Account.hbm.xml</value></list></property>
<property name="hibernateProperties">
<props>
<prop
key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
<prop key="hibernate.show_sql">false</prop>
</props>
</property>
<property name="dataSource">
<ref bean="myDataSource" />
</property>
</bean>
<bean id="myDao"
class="com.xxx.yyy.model.domain.dao.hibernate.MyDaoImpl" >
<property name="sessionFactory"><ref bean="mySessionFactory" />
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager"/>
<bean id="myServiceTarget"
class="com.xxx.yyy.service.admin.MyServiceImpl">
<property name="myDao"><ref bean="myDao"/></property>
</bean>
<bean id="myService"
class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager"><ref bean="transactionManager" />
</property>
<property name="target"><ref local="myServiceTarget" /></property>
<property name="transactionAttributes">
<props>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
</bean>

my classes:

public abstract class MyBaseDao extends HibernateDaoSupport {}

public class MyDaoImpl extends MyBaseDao {
  public void save(MyObject obj) throws DataAccessException {
      this.getHibernateTemplate().saveOrUpdate(obj);
  }
}

[etrier]

we have the same issue on our application

entityEntries Map in StatefulPersistenceContext slowly grow and do out of memory

did you solve your issue ?

[Chandra1234]

any one able to solve this issue?