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Persistence and Transaction Management
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created by <a href="http://community.jboss.org/people/mpiraccini">Marco Piraccini</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/613033#613033">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi Guys, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a very strange behaviour with JBPM5.1 and the persistence. </p><p>I do not specify the TransactionManager in the Environment, but i set only the EntityManager. That seems to be correct, looking at the documentation (see 7.1.3 - Configuring Persistence). </p><p>My persistence unit is configured in that way:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><persistence-unit name="org.jbpm.persistence.jpa" transaction-type="RESOURCE_LOCAL"></p><p>   <class>org.drools.persistence.info.SessionInfo</class></p><p>   <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class></p><p>   <class>org.drools.persistence.info.WorkItemInfo</class></p><p>   <properties></p><p>          <property name="hibernate.hbm2ddl.auto" value="create-drop" /></p><p>          <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" /></p><p>          <property name="hibernate.connection.username" value="xx" /></p><p>          <property name="hibernate.connection.password" value="xx" /></p><p>          <property name="hibernate.show_sql" value="true" /></p><p>          <property name="hibernate.connection.url" value="jdbc:hsqldb:mem:test" />                            </p><p>          <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/></p><p>          <property name="hibernate.max_fetch_depth" value="3"/></p><p>          <property name="hibernate.show_sql" value="true"/></p><p>   </properties></p><p></persistence-unit></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The strange behaviour is that, when I try to run the code from a junit test using:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Environment env = KnowledgeBaseFactory.newEnvironment();</p><p>env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );</p><p>JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, getKnowledgeSessionConfiguration(),env);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I get this NPE:</p><p>18:39:06,775 ERROR [persistence.SingleSessionCommandService] Could not commit session</p><p>java.lang.NullPointerException</p><p>    at org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:197)</p><p>    at org.drools.persistence.jta.JtaTransactionManager.begin(JtaTransactionManager.java:150)</p><p>    at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:120)</p><p>    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)</p><p>    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)</p><p>    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)</p><p>    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)</p><p>    at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)</p><p>    at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)</p><p>    at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>There are some quite strange issues about that:</p><p>1) Why it uses the JtaTransactionManager even if the transaction-type is "RESOURCE_LOCAL"?</p><p>2) If I take a look at the JtaTransactionManager code, the NPE occurs because the UserTransaction is null. That's true, since no-one creates it! Indeed, looking at the SingleSessionCommandService method, the JtaTransactionManager is created in that way:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>this.txm = new JtaTransactionManager( env.get( EnvironmentName.TRANSACTION ),</p><p>                                                      env.get( EnvironmentName.TRANSACTION_SYNCHRONIZATION_REGISTRY ),</p><p>                                                      tm );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>...so, I have to specify the EnvironmentName.TRANSACTION to avoid the NPE? If so, why?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Marco. </p></div>
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