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Re: jbpm 5.4.0 - NullPointerException completing workItem. is this bug not resolved yet ?
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created by <a href="https://community.jboss.org/people/bardelman">Feki Ahmed</a> in <i>jBPM Development</i> - <a href="https://community.jboss.org/message/801076#801076">View the full discussion</a>
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<div class="jive-rendered-content"><p>You are pointing to the right place ! i resolved this problem and i remember that i had to instanciate a new kbuilder, a new  kbase ,a new  env , a new  emf for the session to reload as it is a new created session and even a new client for dealing with tasks. </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>KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();</p><p>        kbuilder.add(new ClassPathResource(proctoreloadname+".bpmn"), ResourceType.BPMN2);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        if (kbuilder.hasErrors()) {</p><p>            for (KnowledgeBuilderError error : kbuilder.getErrors()) {</p><p>                System.out.println(">>> Error:" + error.getMessage());</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            }</p><p>            System.out.println(">>> Knowledge couldn't be parsed! ");</p><p>        }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        kbase = KnowledgeBaseFactory.newKnowledgeBase();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());</p><p>        env = EnvironmentFactory.newEnvironment();</p><p>        emf = Persistence.createEntityManagerFactory("org.jbpm.runtime.ht");</p><p>        env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);</p><p>        env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  </p><p>        processInstance = null;</p><p>  </p><p>  </p><p>               // Let's reload the session </p><p>                  ksessions.add(JPAKnowledgeService.loadStatefulKnowledgeSession(Integer.parseInt(idSessionToReload), kbase, null, env));</p><p>                  ksessions.remove(ksessions.size()-2);</p><p>                  </p><p>                  sessionId= ksessions.get(ksessions.size()-1).getId();</p><p>                  // All the listeners and WorkItemHandlers are volatile, so we need to register them each time that we reload the session</p><p>                  //  from the DB.</p><p>                  clients.add(createTaskService(emf));</p><p>                  clients.remove(clients.size()-2);</p><p>                  clients.get(clients.size()-1).connect();</p><p>                  localHTWorkItemHandlers.add(new LocalHTWorkItemHandler(clients.get(clients.size()-1), ksessions.get(ksessions.size()-1)));</p><p>                  localHTWorkItemHandlers.remove(localHTWorkItemHandlers.size()-2);</p><p>                  try {</p><p>                                        clients.get(clients.size()-1).disconnect();</p><p>                              } catch (Exception e1) {</p><p>                                        // TODO Auto-generated catch block</p><p>                                        e1.printStackTrace();</p><p>                              }</p><p>                  </p><p>                  ksessions.get(ksessions.size()-1).getWorkItemManager().registerWorkItemHandler("Human Task", localHTWorkItemHandlers.get(localHTWorkItemHandlers.size()-1));</p></div>
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