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Process instance execution do not continue to the next task after completing a previous task.
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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/799100#799100">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>i m using jbpm 5.4 embeded on a web application and i ve a problem after completing a task, getting the next task with the "getTasksAssignedAsPotentialOwner" do not return anything.</p><p><span style="font-size: 10pt;">When i created  the session which contain the process i registered a "LocalHTWorkItemHandler", so i don't think i need to complete it in order to the process to be continued.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 10pt;">After the task is completed , i checked on the database and found its status "completed" so i think nothing wrong have happened in completing/persisting operations.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 10pt;">i also don't have any exception and nothing happen in the application , i just can't get the next task.<br/></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><h6>The following is the service java class which contain methods used for creating the session and completing the task.</h6><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class JbpmAPIUtil {</p><p>  </p><p>  </p><p>          public static StatefulKnowledgeSession ksession=null;</p><p>          public static ProcessInstance processInstance;</p><p>  </p><p>          public static List<LunchedProc> lunchedprocs = new ArrayList<LunchedProc>();</p><p>          public static List<ProcessInstanceInfo> procsListfrmdb = new ArrayList<ProcessInstanceInfo>();</p><p>          private static TaskService client;</p><p>  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  </p><p>     /*</p><p>           * Complete a task with a taskid and data for a user </p><p>           */</p><p>  </p><p>          public static void completeTask(long taskId, Map<String,String> data, String userId){</p><p>  </p><p>  </p><p>                    UserTransaction ut=null;</p><p>  </p><p>                    try {</p><p>                              ut = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );</p><p>                    } catch (NamingException e1) { </p><p>                              e1.printStackTrace();</p><p>                    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>                    try {</p><p>                              ut.begin();</p><p>                    } catch (NotSupportedException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (SystemException e) { </p><p>                              e.printStackTrace();</p><p>                    } </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>                      client.start(taskId, userId);</p><p>  </p><p>                    try {</p><p>                              ut.commit();</p><p>                    } catch (IllegalStateException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (SecurityException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (HeuristicMixedException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (HeuristicRollbackException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (RollbackException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (SystemException e) { </p><p>                              e.printStackTrace();</p><p>                    }</p><p>  </p><p>                    ContentData contentData = null;</p><p>                    if (data != null) {</p><p>                              ByteArrayOutputStream bos = new ByteArrayOutputStream();</p><p>                              ObjectOutputStream out;</p><p>                              try {</p><p>                                        out = new ObjectOutputStream(bos);</p><p>                                        out.writeObject(data);</p><p>                                        out.close();</p><p>                                        contentData = new ContentData();</p><p>                                        contentData.setContent(bos.toByteArray());</p><p>                                        contentData.setAccessType(AccessType.Inline);</p><p>                              } catch (IOException e) {</p><p>                                        e.printStackTrace();</p><p>                              }</p><p>                    }</p><p>  </p><p>  </p><p>                    try {</p><p>                              ut.begin();</p><p>                    } catch (NotSupportedException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (SystemException e) { </p><p>                              e.printStackTrace();</p><p>                    }</p><p>  </p><p>                    client.complete(taskId, userId, contentData);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>                    try {</p><p>                              ut.commit();</p><p>                    } catch (IllegalStateException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (SecurityException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (HeuristicMixedException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (HeuristicRollbackException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (RollbackException e) { </p><p>                              e.printStackTrace();</p><p>                    } catch (SystemException e) { </p><p>                              e.printStackTrace();</p><p>                    }</p><p>  </p><p>    }</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>private static StatefulKnowledgeSession CreateSession(String process){</p><p>  </p><p>    KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();</p><p>    kbuilder.add(new ClassPathResource(process), 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>    KnowledgeBase 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>    Environment env = EnvironmentFactory.newEnvironment();</p><p>    EntityManagerFactory 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>    //  creating a Persistence Knowledge Session</p><p>    System.out.println(" >>> Let's create a Persistent Knowledge Session");</p><p>    final StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env);</p><p>    </p><p>    </p><p>    </p><p>    int sessionId = ksession.getId();</p><p>    System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");</p><p>    System.out.println("sessionId : "+sessionId);</p><p>    </p><p>    // We need to register the WorkItems and Listeners that the session will use</p><p>    createTaskService(emf);</p><p>    LocalHTWorkItemHandler localHTWorkItemHandler = new LocalHTWorkItemHandler(client, ksession);</p><p>    </p><p>    </p><p>    </p><p>    ksession.getWorkItemManager().registerWorkItemHandler("Human Task", localHTWorkItemHandler);</p><p>    </p><p>    KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);    </p><p>    </p><p>          return ksession;</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>private static void createTaskService(EntityManagerFactory emf) {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    org.jbpm.task.service.TaskService taskService = new org.jbpm.task.service.TaskService(emf, SystemEventListenerFactory.getSystemEventListener());</p><p>    Map<String, User> users = new HashMap<String, User>();</p><p>    users.put("Administrator", new User("Administrator"));</p><p>    users.put("user1", new User("user1"));</p><p>    users.put("user2", new User("user2"));</p><p>    </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    Map<String, Group> groups = new HashMap<String, Group>();</p><p>    taskService.addUsersAndGroups(users, groups);</p><p>    client = new LocalTaskService(taskService);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    </p><p>  }</p><p>   </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>Please , can someone guess what is wrong ??</p></div>
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