1 Reply Latest reply on Sep 18, 2012 6:14 AM by Andrea Carpineti

    Nullpointer exception when retrieveing tasks for a user

    jess singh Newbie

      I am using JBPM 5.3 with Jboss 7.1 and Seam managed persistence context here is my persistence.xml

       

      <persistence xmlns="http://java.sun.com/xml/ns/persistence"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"

          version="2.0">

          <persistence-unit name="main" transaction-type="JTA">

              <description>Forge Persistence Unit</description>

              <provider>org.hibernate.ejb.HibernatePersistence</provider>

              <jta-data-source>java:jboss/datasources/oracleDS</jta-data-source>

              <mapping-file>META-INF/JBPMOrm-JPA2.xml</mapping-file>

              <mapping-file>META-INF/Taskorm.xml</mapping-file>

              <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>

              <class>org.drools.persistence.info.SessionInfo</class>

              <class>org.drools.persistence.info.WorkItemInfo</class>

       

              <class>org.jbpm.task.Attachment</class>

       

              <class>org.jbpm.task.Content</class>

              <class>org.jbpm.task.BooleanExpression</class>

       

              <class>org.jbpm.task.Comment</class>

              <class>org.jbpm.task.Deadline</class>

              <class>org.jbpm.task.Comment</class>

              <class>org.jbpm.task.Deadline</class>

              <class>org.jbpm.task.Delegation</class>

              <class>org.jbpm.task.Escalation</class>

              <class>org.jbpm.task.Group</class>

              <class>org.jbpm.task.I18NText</class>

       

              <class>org.jbpm.task.Notification</class>

       

              <class>org.jbpm.task.EmailNotification</class>

       

              <class>org.jbpm.task.EmailNotificationHeader</class>

       

              <class>org.jbpm.task.PeopleAssignments</class>

       

              <class>org.jbpm.task.Reassignment</class>

       

              <class>org.jbpm.task.Status</class>

       

              <class>org.jbpm.task.Task</class>

       

       

              <class>org.jbpm.task.TaskData</class>

       

       

              <class>org.jbpm.task.SubTasksStrategy</class>

       

       

              <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>

       

       

              <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>

       

              <class>org.jbpm.task.User</class>

       

              <exclude-unlisted-classes>false</exclude-unlisted-classes>

       

              <!-- <class>org.jbpm.process.audit.ProcessInstanceLog</class> <class>org.jbpm.process.audit.NodeInstanceLog</class>

                  <class>org.jbpm.process.audit.VariableInstanceLog</class> -->

       

       

              <properties>

                  <property name="hibernate.hbm2ddl.auto" value="update" />

                  <property name="hibernate.transaction.flush_before_completion"

                      value="true" />

                  <property name="hibernate.show_sql" value="true" />

                  <property name="hibernate.format_sql" value="true" />

                  <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />

          <!--         

                  <property name="hibernate.transaction.manager_lookup_class"

                      value="org.hibernate.transaction.JBossTransactionManagerLookup" />

          -->

              </properties>

          </persistence-unit>

      </persistence>

       

       

      here is the code  -

       

       

      @Resource( mappedName = "java:/TransactionManager" )

          private TransactionManager tm;

          @Inject

          private UserTransaction ut;

       

          public void startProcess() {

              try {

       

                  // getUserTransaction().begin();

                  new TaskManagerServer().startServer();

                  KnowledgeBase kbase = readKnowledgeBase();

                  TransactionManager manager = (TransactionManager) new InitialContext().lookup( "java:jboss/TransactionManager" );

                 

                 

                  //manager.begin();

                  // create the entity manager factory and register it in the environment

                  EntityManagerFactory emf = EMFactory.getEntityManagerFactory(); // Persistence.createEntityManagerFactory( "main" );

                  Environment env = KnowledgeBaseFactory.newEnvironment();

                  env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );

                   env.set( EnvironmentName.TRANSACTION, ut );

                  env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );

       

                  env.set( EnvironmentName.APP_SCOPED_ENTITY_MANAGER, entityManager );

                  env.set( EnvironmentName.TRANSACTION_MANAGER, manager );

       

                  Map<String,Object> params = new HashMap<String,Object>();

       

                  params.put( "name", "Arthur" );

                  params.put( "money", 800 );

       

                  // create a new knowledge session that uses JPA to store the runtime state

                  StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );

       

                  AsyncMinaHTWorkItemHandler handler = new AsyncMinaHTWorkItemHandler( ksession );

       

                  // CommandBasedWSHumanTaskHandler handler = new CommandBasedWSHumanTaskHandler( ksession );

                  ksession.getWorkItemManager().registerWorkItemHandler( "Human Task", handler );

                  String name = "ksclient-" + UUID.randomUUID();

       

                  // invoke methods on your method here

                  ksession.startProcess( "process_1", params );

       

                  TaskClient client = new TaskClient( new MinaTaskClientConnector( name, new MinaTaskClientHandler(

                                  SystemEventListenerFactory.getSystemEventListener() ) ) );

       

                  client.connect( "127.0.0.1", 9123 );

       

                  BlockingTaskSummaryResponseHandler taskSummaryResponseHandler = new BlockingTaskSummaryResponseHandler();

       

                  client.getTasksAssignedAsPotentialOwner( "john", "en-US", taskSummaryResponseHandler );   // this line throws but continues

       

                  List<TaskSummary> tasks = taskSummaryResponseHandler.getResults();   //  number of tasks is always zero

       

                  for ( TaskSummary taskSummary : tasks ) {

                      System.out.println( taskSummary.getName() );

                  }

                 

                 

                  //manager.commit();

       

                  // getUserTransaction().commit();

                  // ksession.dispose();

              } catch ( Throwable t ) {

                  t.printStackTrace();

              }

          }

       

       

      405 ERROR [org.jbpm.task.service.TaskServerHandler] (NioProcessor-1) Could not start transaction.: java.lang.RuntimeException: Could not start transaction.

          at org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:994) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          at org.jbpm.task.service.TaskServiceSession.addTask(TaskServiceSession.java:186) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:144) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          at org.jbpm.task.service.mina.MinaTaskServerHandler.messageReceived(MinaTaskServerHandler.java:41) [jbpm-human-task-mina-5.3.0.Final.jar:5.3.0.Final]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:713) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:375) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:229) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:176) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:638) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:598) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:587) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:61) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:969) [mina-core-2.0.0-RC1.jar:]

          at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64) [mina-core-2.0.0-RC1.jar:]

          at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_31]

          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_31]

          at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_31]

      Caused by: java.lang.NullPointerException

          at org.drools.persistence.jta.JtaTransactionManager.getStatus(JtaTransactionManager.java:205) [drools-persistence-jpa-5.4.0.Final.jar:5.4.0.Final]

          at org.jbpm.task.service.persistence.TaskJTATransactionManager.getStatus(TaskJTATransactionManager.java:63) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          at org.jbpm.task.service.persistence.TaskJTATransactionManager.begin(TaskJTATransactionManager.java:36) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          at org.jbpm.task.service.persistence.TaskPersistenceManager.beginTransaction(TaskPersistenceManager.java:79) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          at org.jbpm.task.service.TaskServiceSession.doOperationInTransaction(TaskServiceSession.java:976) [jbpm-human-task-core-5.3.0.Final.jar:5.3.0.Final]

          ... 28 more