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Multiple EntityManagers with different persistence units
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created by <a href="http://community.jboss.org/people/pi4630">Pasquale Imbemba</a> in <i>Beginner's Corner</i> - <a href="http://community.jboss.org/message/623935#623935">View the full discussion</a>
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<div class="jive-rendered-content"><p>I've defined two persistence units in my persistence.xml: each one with its own data source (one points to an Oracle database on which I do reads, the other points to the HsqlDB I use to write).</p><p>Entity beans are mapped (by annotations) correctly. In my SLSB I inject two distinct EntityManagers, that refer to the relative name of the persistence units.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In my business method, I do a db read using the EntityManager pointing to the OracleDB and then I call a private method, where I instantiate a new entity which corresponds to a table on my HsqlDB. I then pass this object to myHsqlDbEMan.persist() method at the end of the private method.</p><p>Soon after the methods are terminated (and the server is committing changes to the database), I get the following error:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ERROR <a class="" href="http://community.jboss.org/message/623935#623935#623935/org.hibernate.util.JDBCExceptionReporter">Multiple EntityManagers with different persistence units</a> (WorkerThread#0[127.0.0.1:48655]) Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple &lt; ac, BasicAction: 0:ffff7f000101:126a:4e5def22:c status: ActionStatus.ABORT_ONLY &gt;); - nested throwable: (org.jboss.resource.JBossResourceException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple &lt; ac, BasicAction: 0:ffff7f000101:126a:4e5def22:c status: ActionStatus.ABORT_ONLY &gt;))</p><p>2011-08-31 10:22:49,884 ERROR <a class="jive-link-external-small" href="org.hibernate.event.def.AbstractFlushingEventListener">org.hibernate.event.def.AbstractFlushingEventListener</a> (WorkerThread#0[127.0.0.1:48655]) Could not synchronize database state with session: org.hibernate.exception.GenericJDBCException: Cannot open connection</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>How do I handle two different persistence contexts? I've tried to refactor my SB as Stateful and extend the persistence context of both persistence units, but that didn't work (returned same error). I also tried to refactor that writeToDb() to another SessionBean and use the HsqlDB context only there and invoke the method from my other bean, but that didn't work either.</p><p>I presumed that by using the different EntityManager, the AS would know about which context the method is in.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance,</p></div>
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