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Nullpointer exception when retrieveing tasks for a user
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created by <a href="https://community.jboss.org/people/singhjess">jess singh</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/747629#747629">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am using JBPM 5.3 with Jboss 7.1 and Seam managed persistence context here is my persistence.xml </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span><persistence xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a><span>"</span></p><p><span>    xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"</span></p><p><span>    xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" target="_blank">http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd</a><span>"</span></p><p>    version="2.0"></p><p>    <persistence-unit name="main" transaction-type="JTA"></p><p>        <description>Forge Persistence Unit</description></p><p>        <provider>org.hibernate.ejb.HibernatePersistence</provider></p><p>        <jta-data-source>java:jboss/datasources/oracleDS</jta-data-source></p><p>        <mapping-file>META-INF/JBPMOrm-JPA2.xml</mapping-file></p><p>        <mapping-file>META-INF/Taskorm.xml</mapping-file></p><p>        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class></p><p>        <class>org.drools.persistence.info.SessionInfo</class></p><p>        <class>org.drools.persistence.info.WorkItemInfo</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Attachment</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Content</class></p><p>        <class>org.jbpm.task.BooleanExpression</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Comment</class></p><p>        <class>org.jbpm.task.Deadline</class></p><p>        <class>org.jbpm.task.Comment</class></p><p>        <class>org.jbpm.task.Deadline</class></p><p>        <class>org.jbpm.task.Delegation</class></p><p>        <class>org.jbpm.task.Escalation</class></p><p>        <class>org.jbpm.task.Group</class></p><p>        <class>org.jbpm.task.I18NText</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Notification</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.EmailNotification</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.EmailNotificationHeader</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.PeopleAssignments</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Reassignment</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Status</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.Task</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.TaskData</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.SubTasksStrategy</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <class>org.jbpm.task.User</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <exclude-unlisted-classes>false</exclude-unlisted-classes></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <!-- <class>org.jbpm.process.audit.ProcessInstanceLog</class> <class>org.jbpm.process.audit.NodeInstanceLog</class> </p><p>            <class>org.jbpm.process.audit.VariableInstanceLog</class> --></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <properties></p><p>            <property name="hibernate.hbm2ddl.auto" value="update" /></p><p>            <property name="hibernate.transaction.flush_before_completion"</p><p>                value="true" /></p><p>            <property name="hibernate.show_sql" value="true" /></p><p>            <property name="hibernate.format_sql" value="true" /></p><p>            <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" /></p><p>    <!--          </p><p>            <property name="hibernate.transaction.manager_lookup_class"</p><p>                value="org.hibernate.transaction.JBossTransactionManagerLookup" /></p><p>    --></p><p>        </properties></p><p>    </persistence-unit></p><p></persistence></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>here is the code  - </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Resource( mappedName = "java:/TransactionManager" )</p><p>    private TransactionManager tm;</p><p>    @Inject</p><p>    private UserTransaction ut;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void startProcess() {</p><p>        try {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            // getUserTransaction().begin();</p><p>            new TaskManagerServer().startServer();</p><p>            KnowledgeBase kbase = readKnowledgeBase();</p><p>            TransactionManager manager = (TransactionManager) new InitialContext().lookup( "java:jboss/TransactionManager" );</p><p>            </p><p>            </p><p>            //manager.begin();</p><p>            // create the entity manager factory and register it in the environment</p><p>            EntityManagerFactory emf = EMFactory.getEntityManagerFactory(); // Persistence.createEntityManagerFactory( "main" );</p><p>            Environment env = KnowledgeBaseFactory.newEnvironment();</p><p>            env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );</p><p>             env.set( EnvironmentName.TRANSACTION, ut );</p><p>            env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            env.set( EnvironmentName.APP_SCOPED_ENTITY_MANAGER, entityManager );</p><p>            env.set( EnvironmentName.TRANSACTION_MANAGER, manager );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            Map<String,Object> params = new HashMap<String,Object>();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            params.put( "name", "Arthur" );</p><p>            params.put( "money", 800 );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            // create a new knowledge session that uses JPA to store the runtime state</p><p>            StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            AsyncMinaHTWorkItemHandler handler = new AsyncMinaHTWorkItemHandler( ksession );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            // CommandBasedWSHumanTaskHandler handler = new CommandBasedWSHumanTaskHandler( ksession );</p><p>            ksession.getWorkItemManager().registerWorkItemHandler( "Human Task", handler );</p><p>            String name = "ksclient-" + UUID.randomUUID();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            // invoke methods on your method here</p><p>            ksession.startProcess( "process_1", params );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            TaskClient client = new TaskClient( new MinaTaskClientConnector( name, new MinaTaskClientHandler(</p><p>                            SystemEventListenerFactory.getSystemEventListener() ) ) );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            client.connect( "127.0.0.1", 9123 );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            BlockingTaskSummaryResponseHandler taskSummaryResponseHandler = new BlockingTaskSummaryResponseHandler();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            client.getTasksAssignedAsPotentialOwner( "john", "en-US", taskSummaryResponseHandler );   // this line throws but continues</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            List<TaskSummary> tasks = taskSummaryResponseHandler.getResults();   //  number of tasks is always zero</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            for ( TaskSummary taskSummary : tasks ) {</p><p>                System.out.println( taskSummary.getName() );</p><p>            }</p><p>            </p><p>            </p><p>            //manager.commit();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            // getUserTransaction().commit();</p><p>            // ksession.dispose();</p><p>        } catch ( Throwable t ) {</p><p>            t.printStackTrace();</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>405 ERROR [org.jbpm.task.service.TaskServerHandler] (NioProcessor-1) Could not start transaction.: java.lang.RuntimeException: Could not start transaction.</p><p>    at org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:994) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.jbpm.task.service.TaskServiceSession.addTask(TaskServiceSession.java:186) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:144) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.jbpm.task.service.mina.MinaTaskServerHandler.messageReceived(MinaTaskServerHandler.java:41) [jbpm-human-task-mina-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:713) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:375) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:229) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:176) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:638) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:598) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:587) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:61) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:969) [mina-core-2.0.0-RC1.jar:]</p><p>    at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64) [mina-core-2.0.0-RC1.jar:]</p><p>    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_31]</p><p>    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_31]</p><p>    at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_31]</p><p>Caused by: java.lang.NullPointerException</p><p>    at org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:205) [drools-persistence-jpa-5.4.0.Final.jar:5.4.0.Final]</p><p>    at org.jbpm.task.service.persistence.TaskJTATransactionManager.getStatus(TaskJTATransactionManager.java:63) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.jbpm.task.service.persistence.TaskJTATransactionManager.begin(TaskJTATransactionManager.java:36) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.jbpm.task.service.persistence.TaskPersistenceManager.beginTransaction(TaskPersistenceManager.java:79) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    at org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:976) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]</p><p>    ... 28 more</p></div>
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