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Re: Completing a Task Fails after Calling statefulSession.dispose
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created by <a href="http://community.jboss.org/people/williajd">James Williams</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/621903#621903">View the full discussion</a>
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<div class="jive-rendered-content"><p>OK. I've fixed it. I had to write my own version of the PersistenceContextManager.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.persistence.EntityManager;</p><p>import javax.persistence.EntityManagerFactory;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.drools.persistence.PersistenceContext;</p><p>import org.drools.persistence.jpa.JpaPersistenceContext;</p><p>import org.drools.runtime.Environment;</p><p>import org.drools.runtime.EnvironmentName;</p><p>import org.jbpm.persistence.JpaProcessPersistenceContext;</p><p>import org.jbpm.persistence.ProcessPersistenceContext;</p><p>import org.jbpm.persistence.ProcessPersistenceContextManager;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class MultipleUseJpaPersistenceContextManager implements ProcessPersistenceContextManager {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    Environment env;</p><p>    private EntityManagerFactory emf;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private EntityManager appScopedEntityManager;</p><p>    protected EntityManager cmdScopedEntityManager;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private boolean internalAppScopedEntityManager;</p><p>    private boolean internalCmdScopedEntityManager;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public MultipleUseJpaPersistenceContextManager(Environment env) {</p><p>        this.env = env;</p><p>        this.emf = (EntityManagerFactory) env.get(EnvironmentName.ENTITY_MANAGER_FACTORY);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public PersistenceContext getApplicationScopedPersistenceContext() {</p><p><strong>        checkAppScopedEntityManager();</strong></p><p>        return new JpaPersistenceContext(appScopedEntityManager);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private void checkAppScopedEntityManager() {</p><p>        if (this.appScopedEntityManager == null) {</p><p>            // Use the App scoped EntityManager if the user has provided it, and it is open.</p><p>            this.appScopedEntityManager = (EntityManager) this.env.get(EnvironmentName.APP_SCOPED_ENTITY_MANAGER);</p><p>            if (this.appScopedEntityManager != null && !this.appScopedEntityManager.isOpen()) {</p><p>                throw new RuntimeException("Provided APP_SCOPED_ENTITY_MANAGER is not open");</p><p>            }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            if (this.appScopedEntityManager == null) {</p><p>                internalAppScopedEntityManager = true;</p><p>                this.appScopedEntityManager = this.emf.createEntityManager();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>                this.env.set(EnvironmentName.APP_SCOPED_ENTITY_MANAGER, this.appScopedEntityManager);</p><p>            } else {</p><p>                internalAppScopedEntityManager = false;</p><p>            }</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public PersistenceContext getCommandScopedPersistenceContext() {</p><p>        return new JpaPersistenceContext(this.cmdScopedEntityManager);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void beginCommandScopedEntityManager() {</p><p><strong>        checkAppScopedEntityManager();</strong></p><p>        EntityManager cmdScopedEntityManager = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);</p><p>        if (cmdScopedEntityManager == null</p><p>                || (this.cmdScopedEntityManager != null && !this.cmdScopedEntityManager.isOpen())) {</p><p>            internalCmdScopedEntityManager = true;</p><p>            this.cmdScopedEntityManager = this.emf.createEntityManager(); // no need to call joinTransaction as it will</p><p>                                                                          // do so if one already exists</p><p>            this.env.set(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER, this.cmdScopedEntityManager);</p><p>            cmdScopedEntityManager = this.cmdScopedEntityManager;</p><p>        } else {</p><p>            internalCmdScopedEntityManager = false;</p><p>        }</p><p>        cmdScopedEntityManager.joinTransaction();</p><p>        appScopedEntityManager.joinTransaction();</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void endCommandScopedEntityManager() {</p><p>        if (this.internalCmdScopedEntityManager) {</p><p>            this.env.set(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER, null);</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void dispose() {</p><p>        if (this.internalAppScopedEntityManager) {</p><p>            if (this.appScopedEntityManager != null && this.appScopedEntityManager.isOpen()) {</p><p>                this.appScopedEntityManager.close();</p><p>            }</p><p>            this.internalAppScopedEntityManager = false;</p><p>            this.env.set(EnvironmentName.APP_SCOPED_ENTITY_MANAGER, null);</p><p>            this.appScopedEntityManager = null;</p><p>        }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        if (this.internalCmdScopedEntityManager) {</p><p>            if (this.cmdScopedEntityManager != null && this.cmdScopedEntityManager.isOpen()) {</p><p>                this.cmdScopedEntityManager.close();</p><p>            }</p><p>            this.internalCmdScopedEntityManager = false;</p><p>            this.env.set(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER, null);</p><p>            this.cmdScopedEntityManager = null;</p><p>        }</p><p>    }</p><p>      </p><p>    @Override</p><p>    public ProcessPersistenceContext getProcessPersistenceContext() {</p><p>        if (cmdScopedEntityManager == null) {</p><p>            this.emf.createEntityManager();;</p><p>        }</p><p>        return new JpaProcessPersistenceContext(cmdScopedEntityManager);</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This version checks that it has a valid appScopedEntityManager and creates one if necessary. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I then make sure this one is used instead of the default one provided by JBPM when creating my knowledgeSession:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            Environment env = KnowledgeBaseFactory.newEnvironment();</p><p>            env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, entityManagerFactory);</p><p>            InitialContext ctx = new InitialContext();</p><p>            UserTransaction transactionManager = (UserTransaction) ctx.lookup("java:comp/UserTransaction");</p><p>           <strong> env.set(EnvironmentName.TRANSACTION_MANAGER, </strong></p><p><strong>                    new JtaTransactionManager(transactionManager, null, transactionManager));</strong></p><p>            <strong>env.set(EnvironmentName.PERSISTENCE_CONTEXT_MANAGER, </strong></p><p><strong>                    new MultipleUseJpaPersistenceContextManager(env));</strong></p><p>            </p><p>            StatefulKnowledgeSession knowledgeSession = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, env);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I hope this helps others.</p></div>
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