1 2 Previous Next 17 Replies Latest reply on Jul 27, 2011 12:57 PM by Jo Blithe

    How to continue process in a web application

    Jo Blithe Newbie


      //StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

       

       

      I want to continue the process in another JSP page but I don't know what method to call from the kbase object to  initialize with ksession to load the previous state from the database.

       

      How can I load the current state of my process from the database to continue my process?

        • 1. Re: How to continue process in a web application
          Demian Calcaprina Master

          Hi man, this should help:

          StatefulKnowledgeSession session = JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, kbase, config, env)

           

          Demian

          • 2. Re: How to continue process in a web application
            Jo Blithe Newbie

            Thanks Demian. BUt how can I get the sessionId?

            • 3. Re: How to continue process in a web application
              Demian Calcaprina Master

              You may save it in a variable before disposing the session, for example after creating the session:

              ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, environment);

              int sessionId = ksession.getId();

              • 4. Re: How to continue process in a web application
                Jo Blithe Newbie

                Thanks Demian. I got this error using JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env ). What do you think I am doing wrong to get Java null pointer exception:

                 

                Exception in thread "main" 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.sample.ProcessTest.main(ProcessTest.java:69)

                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)

                          ... 3 more

                Caused by: java.lang.RuntimeException: Could not commit session or rollback

                          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:133)

                          ... 8 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)

                          ... 8 more

                Caused by: java.lang.NullPointerException

                          at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:181)

                          ... 9 more

                 

                 

                Here is part of my code below:

                 

                KnowledgeBase kbase = readKnowledgeBase();

                                    

                                      EntityManagerFactory emf =

                                          Persistence.createEntityManagerFactory( "org.jbpm.task" );

                                      Environment env = KnowledgeBaseFactory.newEnvironment();

                                      env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );

                                    

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

                 

                   ksession.startProcess("com.sample.bpmn.hello");

                 

                Thanks again for your time.

                • 5. Re: How to continue process in a web application
                  Demian Calcaprina Master

                  Try with

                  EntityManagerFactory emf = Persistence

                                                          .createEntityManagerFactory("org.jbpm.persistence.jpa");

                   

                  "org.jbpm.task" should be used to construct your task service, not to create the session (for example, https://github.com/calcacuervo/JBPM5-Samples/blob/master/human-tasks/src/test/java/com/test/BaseHumanTaskTest.java)

                   

                  Demian

                  • 7. Re: How to continue process in a web application
                    Gary tse Newbie

                    >>>

                    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)

                              ... 8 more

                    Caused by: java.lang.NullPointerException

                              at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:181)

                              ... 9 more

                    <<<

                     

                    My guess, is that you're trying to run it outside a J2EE container; it doesnt work.  (see https://issues.jboss.org/browse/JBPM-3282

                     

                    Otherwise, double check the persistence.xml file

                    • 8. Re: How to continue process in a web application
                      Jo Blithe Newbie

                      Gary thanks for replying, but the thread wasn't helpful.

                       

                      Thanks a lot Demian, it was a perfect example for me. Through the example I was able to run the application as a desktop applicaton, and it worked perfectly fine and persisted to my postgres database. But when I decided to run the same application as a web application with tomcat 6.0 for deployment, then I get this error and do you know why:

                       

                                           

                      SEVERE: Could not synchronize database state with session

                      org.hibernate.exception.GenericJDBCException: could not insert: [org.drools.persistence.info.SessionInfo]

                                at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)

                                at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)

                                at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)

                                at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2295)

                                at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2688)

                                at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:79)

                                at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)

                                at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)

                                at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)

                                at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)

                                at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)

                                at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)

                                at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)

                                at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504)

                                at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)

                                at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)

                                at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)

                                at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:167)

                                at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:127)

                                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)

                                at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)

                                at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:109)

                                at org.apache.jsp.index_jsp._jspService(index_jsp.java:174)

                                at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

                                at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

                                at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)

                                at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

                                at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

                                at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

                                at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

                                at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

                                at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

                                at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

                                at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

                                at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

                                at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

                                at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

                                at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)

                                at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

                                at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

                                at java.lang.Thread.run(Thread.java:619)

                      Caused by: org.postgresql.util.PSQLException: Large Objects may not be used in auto-commit mode.

                                at org.postgresql.largeobject.LargeObjectManager.createLO(LargeObjectManager.java:241)

                                at org.postgresql.largeobject.LargeObjectManager.createLO(LargeObjectManager.java:228)

                                at org.postgresql.jdbc2.AbstractJdbc2Statement.setBlob(AbstractJdbc2Statement.java:2817)

                                at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.setBlob(DelegatingPreparedStatement.java:181)

                                at org.hibernate.type.ByteArrayBlobType.set(ByteArrayBlobType.java:106)

                                at org.hibernate.type.AbstractLobType.nullSafeSet(AbstractLobType.java:57)

                                at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2025)

                                at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2271)

                                ... 41 more

                      Jul 25, 2011 10:09:46 AM org.drools.persistence.jta.JtaTransactionManager commit

                      WARNING: Unable to commit transaction

                      javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [org.drools.persistence.info.SessionInfo]

                                at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)

                                at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:513)

                                at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)

                                at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)

                                at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)

                                at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:167)

                                at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:127)

                                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)

                                at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)

                                at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:109)

                                at org.apache.jsp.index_jsp._jspService(index_jsp.java:174)

                                at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

                                at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

                                at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)

                                at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

                                at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

                                at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

                                at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

                                at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

                                at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

                                at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

                                at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

                                at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

                                at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

                                at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)

                                at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)

                                at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)

                                at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

                                at java.lang.Thread.run(Thread.java:619)

                      Caused by: org.hibernate.exception.GenericJDBCException: could not insert: [org.drools.persistence.info.SessionInfo]

                                at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)

                                at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)

                                at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)

                                at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2295)

                                at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2688)

                                at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:79)

                                at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)

                                at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)

                                at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)

                                at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)

                                at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)

                                at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)

                                at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)

                                at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504)

                                ... 31 more

                      Caused by: org.postgresql.util.PSQLException: Large Objects may not be used in auto-commit mode.

                                at org.postgresql.largeobject.LargeObjectManager.createLO(LargeObjectManager.java:241)

                                at org.postgresql.largeobject.LargeObjectManager.createLO(LargeObjectManager.java:228)

                                at org.postgresql.jdbc2.AbstractJdbc2Statement.setBlob(AbstractJdbc2Statement.java:2817)

                                at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.setBlob(DelegatingPreparedStatement.java:181)

                                at org.hibernate.type.ByteArrayBlobType.set(ByteArrayBlobType.java:106)

                                at org.hibernate.type.AbstractLobType.nullSafeSet(AbstractLobType.java:57)

                                at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2025)

                                at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2271)

                                ... 41 more

                      • 9. Re: How to continue process in a web application
                        Demian Calcaprina Master

                        It seems to be related with transaction configuration, in which the UserTransaction is not being created. I configured it following these:

                        http://community.jboss.org/people/bpmn2user/blog/2011/02/26/orcale-integration-with-jbpm5

                         

                        And worked.

                         

                        If is does not work, please attach some test that shows your persistence/transaction configuration.

                         

                        Regards,

                         

                        Demian

                        • 12. Re: How to continue process in a web application
                          Jo Blithe Newbie

                          Hi Demian, I got it solved now. I had to set Hibernate autocomit to false. Thanks for your time, really appreciate it. I just can't get the process to continue in another JSP page which is frustrating. When I run the other jsp page to continue the process it clears all data in the task table. And also, the sessioninfo table isn't persisting. What do you think I may be doing wrong?

                          • 13. Re: How to continue process in a web application
                            Marie MM Newbie

                            Don't have you

                            <property name="hibernate.hbm2ddl.auto" value="create"/> in persistence.xml?

                            • 14. Re: How to continue process in a web application
                              Jo Blithe Newbie

                              Thanks Marie. But create is also doing the same. I had create-drop before.

                              1 2 Previous Next