[jboss-user] [EJB 3.0] - Lazy loading problem: ERROR [LazyInitializationException]

[Gabriel Muench]

Gabriel Muench [http://community.jboss.org/people/Fuchs] created the discussion

"Lazy loading problem: ERROR [LazyInitializationException]"

To view the discussion, visit: http://community.jboss.org/message/533329#533329

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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!

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