0 Replies Latest reply on Mar 22, 2010 12:34 PM by Gabriel Muench

    Lazy loading problem: ERROR [LazyInitializationException]

    Gabriel Muench Newbie

      Hello, i have a problem with LazyInitialization.

       

      Here is the error message:

       

      15:25:14,950 ERROR [LazyInitializationException] failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed

      org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed

          at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)

      ...

      15:25:14,955 ERROR [LazyInitializationException] failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed

      org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed

          at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)

      ...

      15:25:14,958 ERROR [STDERR] org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed

          at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)

      ...

      15:25:14,959 ERROR [STDERR] rtal.portlet.aspects.portlet.PortletSessionSynchronizationInterceptor.invoke(PortletSessionSynchronizationInterceptor.java:82)

          at org.jboss.portal.portlet.PortletInvokerInterceptor.invoke(PortletInvokerInterceptor.java:82)

      ...

      15:25:14,960 ERROR [STDERR] ptor.invoke(ControllerInterceptor.java:40)

          at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)

      ...

      15:25:14,960 ERROR [STDERR] ts.tx.TxInterceptor$RequiresNew.invoke(TxInterceptor.java:253)

          at org.jboss.portal.core.aspects.server.TransactionInterceptor$invoke_N5143606530999904530.invokeNext(TransactionInterceptor$invoke_N5143606530999904530.java)

      ...

       

      About the environment:

      I use Hibernate as persistence provider and

      EJB 3 Annotations + Java 5 to map a MySQL database.

      The mapping is intergrated into the JBoss Portal 2.7.2 server.

       

      My JSF 1.1.14 + Facelets and Richfaces 3.3.1 portlet with PortletBridge 1.0.0 use the persistence mapping in this way:

       

      ICustomerHome customers = (ICustomerHome) context.lookup("CustomerHome/local");

      customer = customers.findByJbossUser(username);

      powIds = new ArrayList<Integer>();

      powMeterList = customer.getPowMeters();

       

      This is what i have done to avoid the problem with lazy loading, till now:

       

      Customer instance = entityManager.find(Customer.class, id);

      instance.getPowMeters().size();

       

      But i think this solution is not the right way. There must be a fault in "Transaction",

      because the same should be done with EAGER loading.

      If i use EAGER FetchType instead of LAZY the problem will not be solved.

       

      @OneToMany(fetch = FetchType.EAGER, mappedBy = "customer")

      public Set<PowMeter> getPowMeters() {

          return this.powMeters;

      }

       

      Can anyone help me, please?

       

      Cheers!