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Lazy loading problem: ERROR [LazyInitializationException]
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created by <a href="http://community.jboss.org/people/Fuchs">Gabriel Muench</a> in <i>EJB 3.0</i> - <a href="http://community.jboss.org/message/533329#533329">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello, i have a problem with LazyInitialization.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is the error message:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #800000;">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<br/></span></p><p><span style="color: #800000;">org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed<br/></span></p><p><span style="color: #800000;">    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)<br/></span></p><p><span style="color: #800000;">...<br/></span></p><p><span style="color: #800000;">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<br/></span></p><p><span style="color: #800000;">org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: de.database.entities.Customer.powMeters, no session or session was closed<br/></span></p><p><span style="color: #800000;">    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)<br/></span></p><p><span style="color: #800000;">...<br/></span></p><p><span style="color: #800000;">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<br/></span></p><p><span style="color: #800000;">    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)<br/></span></p><p><span style="color: #800000;">...<br/></span></p><p><span style="color: #800000;">15:25:14,959 ERROR [STDERR] rtal.portlet.aspects.portlet.PortletSessionSynchronizationInterceptor.invoke(PortletSessionSynchronizationInterceptor.java:82)<br/></span></p><p><span style="color: #800000;">    at org.jboss.portal.portlet.PortletInvokerInterceptor.invoke(PortletInvokerInterceptor.java:82)<br/></span></p><p><span style="color: #800000;">...<br/></span></p><p><span style="color: #800000;">15:25:14,960 ERROR [STDERR] ptor.invoke(ControllerInterceptor.java:40)<br/></span></p><p><span style="color: #800000;">    at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)<br/></span></p><p><span style="color: #800000;">...<br/></span></p><p><span style="color: #800000;">15:25:14,960 ERROR [STDERR] ts.tx.TxInterceptor$RequiresNew.invoke(TxInterceptor.java:253)<br/></span></p><p><span style="color: #800000;">    at org.jboss.portal.core.aspects.server.TransactionInterceptor$invoke_N5143606530999904530.invokeNext(TransactionInterceptor$invoke_N5143606530999904530.java)<br/></span></p><p><span style="color: #800000;">... </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>About the environment:</p><p>I use Hibernate as persistence provider and</p><p>EJB 3 Annotations + Java 5 to map a MySQL database.</p><p>The mapping is intergrated into the JBoss Portal 2.7.2 server.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My JSF 1.1.14 + Facelets and Richfaces 3.3.1 portlet with PortletBridge 1.0.0 use the persistence mapping in this way:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #008000;">ICustomerHome customers = (ICustomerHome) context.lookup("CustomerHome/local");<br/></span></p><p><span style="color: #008000;">customer = customers.findByJbossUser(username);<br/></span></p><p><span style="color: #008000;">powIds = new ArrayList<Integer>();<br/></span></p><p><span style="color: #008000;">powMeterList = customer.getPowMeters(); </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is what i have done to avoid the problem with lazy loading, till now:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #008000;">Customer instance = entityManager.find(Customer.class, id);<br/></span></p><p><span style="color: #008000;">instance.getPowMeters().size(); </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>But i think this solution is not the right way. There must be a fault in "Transaction",</p><p>because the same should be done with EAGER loading.</p><p>If i use EAGER FetchType instead of LAZY the problem will not be solved.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #008000;">@OneToMany(fetch = FetchType.EAGER, mappedBy = "customer")<br/></span></p><p><span style="color: #008000;">public Set<PowMeter> getPowMeters() {<br/></span></p><p><span style="color: #008000;">    return this.powMeters;<br/></span></p><p><span style="color: #008000;">} </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"><span style="color: #008000;"> </span> </p><p>Can anyone help me, please?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Cheers!</p></div>
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