Re: [rules-users] Caused by: java.lang.NullPointerException at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:181)

Thanks! Can you elaborate the solution? *From:* Esteban [via Drools - Java Rules Engine] [mailto:[hidden email]<http://user/SendEmail.jtp?type=node&node=2602869&i=0>] *Sent:* Tuesday, March 01, 2011 2:37 PM *To:* Odelya Holiday *Subject:* Re: Caused by: java.lang.NullPointerException at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:181) Unfortunately there is a "bug" (it is not really a bug but an omission in the code) that hides the real exception going on. The piece of code giving you troubles is (SingleSessionCommandService.java lines 119 - 138): *try {* * this.txm.begin();* * * * //this.appScopedEntityManager.joinTransaction();* * registerRollbackSync();* * jpm.getApplicationScopedPersistenceContext().persist( this.sessionInfo );* * this.txm.commit();* * } catch ( Exception t1 ) {* * try {* * this.txm.rollback();* * } catch ( Throwable t2 ) {* * throw new RuntimeException( "Could not commit session or rollback",* * t2 );* * }* * throw new RuntimeException( "Could not commit session",* * t1 );* * }* As you can see, when there is a problem in the body of the try-catch, drools tries to rollback the session. If the rollback itself fails, you get the exception "Could not commit session or rollback", but the original exception (t1) is lost. We already fixed a similar issue in SingleSessionCommandService#execute() and created a rollbackTransaction() method that logs the first exception if the session rollback fails. So, the solution (not a solution but a hack to see what is really going on) is to use the same rollbackTransaction() method in the catch part. If you want to see the real exception, you will need to download drools-persistence-jpa sources from https://github.com/droolsjbpm/drools/tree/master/drools-persistence-jpa and debug through the lines I mentioned. Or you can wait us to patch the code ;) For the records, this is the bug previously reported: https://issues.jboss.org/browse/JBRULES-2656. I will create a new one and link them together. Best Regards, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Esteban Aliverti - Developer @ http://www.plugtree.com - Blog @ http://ilesteban.wordpress.com On Tue, Mar 1, 2011 at 7:53 AM, odelyaholiday <[hidden email]<http://user/SendEmail.jtp?type=node&node=2602731&i=0&by-user=t>> wrote: Hi! I am working already for 3 days, trying to configure bitronix with spring and drools. I defined 1. persistence unit: <persistence-unit name="org.drools.persistence.jpa" transaction-type="JTA"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>jdbc/DS1</jta-data-source> <class>org.drools.persistence.info.SessionInfo</class> <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class> <class>org.drools.persistence.info.WorkItemInfo</class> <exclude-unlisted-classes>true</exclude-unlisted-classes> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" /> <property name="hibernate.connection.autocommit" value="false" /> <property name="hibernate.max_fetch_depth" value="3" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.current_session_context_class" value="jta" /> <property name="hibernate.connection.driver_class" value="oracle.jdbc.xa.client.OracleXADataSource" /> <property name="hibernate.jndi.class" value="bitronix.tm.jndi.BitronixInitialContextFactory"/> <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" /> </properties> </persistence-unit> 2. in my application context: <!-- Bitronix Transaction Manager embedded configuration --> <bean id="oracleDataSource" class="bitronix.tm.resource.jdbc.PoolingDataSource" init-method="init" destroy-method="close"> <property name="className" value="oracle.jdbc.xa.client.OracleXADataSource" /> <property name="uniqueName" value="jdbc/DS1" /> <property name="maxPoolSize" value="5" /> <property name="allowLocalTransactions" value="true" /> <property name="testQuery" value="SELECT 1 FROM DUAL" /> <property name="driverProperties"> <props> <prop key="user">myuser</prop> <prop key="password">myuser</prop> <prop key="URL">myurl</prop> </props> </property> </bean> <bean id="btmConfig" factory-method="getConfiguration" class="bitronix.tm.TransactionManagerServices"> <property name="serverId" value="spring-btm" /> </bean> <bean id="BitronixTransactionManager" factory-method="getTransactionManager" class="bitronix.tm.TransactionManagerServices" depends-on="btmConfig" destroy-method="shutdown" /> <bean id="JtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager"> <property name="transactionManager" ref="BitronixTransactionManager" /> <property name="userTransaction" ref="BitronixTransactionManager" /> </bean> <!-- end of Bitronix Transaction Manager embedded configuration --> 3. and in the code: EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa"); Environment env = KnowledgeBaseFactory.newEnvironment(); env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf); env.set(EnvironmentName.GLOBALS, new MapGlobalResolver()); env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager()); ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env); However in the last code I get: Caused by: java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:130) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54) at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:109) at com.mycompany.util.BookWorkflowUtilities.createSession(BookWorkflowUtilities.java:83) at com.mycompany.util.BookWorkflowService.init(BookWorkflowService.java:62) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:340) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:293) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:130) ... 29 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116) ... 40 more Caused by: java.lang.RuntimeException: Could not commit session or rollback at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:133) ... 45 more Caused by: java.lang.RuntimeException: Unable to rollback transaction at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:184) at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:131) ... 45 more Caused by: java.lang.NullPointerException at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:181) -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Caused-by-java-lang-N... 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