[jboss-user] [jBPM] - How to resume a process instance from a loaded session in jbpm 5.0

[Feki Ahmed]

Feki Ahmed [https://community.jboss.org/people/bardelman] created the discussion

"How to resume a process instance from a loaded session in jbpm 5.0"

To view the discussion, visit: https://community.jboss.org/message/797952#797952

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Hi, 
i ve tried to load a session from the database with the loadStatefulKnowledgeSession, and then i tried to active a process Instance from that loaded session so i tried with  ksession.startProcess(String processId) but it started a new process instance and not the old persisted one.
now i know that startProcess isn't the appropriate method to do that but i still don't know what's the right way ...



here is my code , it s a java class: 


public static void main(String[] args) {





                    ksession = ReloadSession(SessionId, taskname);


                    UserTransaction ut = null;
                    try {
                              ut = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
                    } catch (NamingException e1) { 
                              e1.printStackTrace();
                    }


                    try {
                              ut.begin();
                    } catch (NotSupportedException e) { 
                              e.printStackTrace();
                    } catch (SystemException e) { 
                              e.printStackTrace();
                    } 


                    processInstance = ksession.startProcess(taskname);



                    ksession.fireAllRules();
                    try {
                              ut.commit();
                    } catch (IllegalStateException e) { 
                              e.printStackTrace();
                    } catch (SecurityException e) { 
                              e.printStackTrace();
                    } catch (HeuristicMixedException e) { 
                              e.printStackTrace();
                    } catch (HeuristicRollbackException e) { 
                              e.printStackTrace();
                    } catch (RollbackException e) { 
                              e.printStackTrace();
                    } catch (SystemException e) { 
                              e.printStackTrace();
                    }



          }




private StatefulKnowledgeSession ReloadSession(String tasktoreloadidSession,String tasktoreloadname){

                    StatefulKnowledgeSession ksession =null;
                    try {

                  UserTransaction ut = (UserTransaction) new InitialContext().lookup( "java:comp/UserTransaction" );
            ut.begin();
            ksession = JbpmAPIUtil.loadStatefulKnowledgeSession(Integer.parseInt(tasktoreloadidSession), tasktoreloadname+".bpmn");

                  /*Create the knowledge base  */

                              KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newThreadedFileLogger(ksession, "testlog", 1000);
                              CommandBasedWSHumanTaskHandler taskHandler = new CommandBasedWSHumanTaskHandler(ksession);
                              ksession.getWorkItemManager().registerWorkItemHandler("Human Task", taskHandler);
                              taskHandler.connect();
                              ut.commit();

                              logger.close();
                    } catch (Throwable t) {
                              log.error(t.getMessage(), t.getCause());
                              throw new RuntimeException("error while reloading session",t);
                    }
                    return ksession;

          }


public static StatefulKnowledgeSession loadStatefulKnowledgeSession(int idsession,String processName) throws Exception {

                    /*
                     * Create the knowledgebase using the required bpmn and drl files
                     */
                    KnowledgeBase kbase = readKnowledgeBase(processName);
                    EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" );
                    Environment env = KnowledgeBaseFactory.newEnvironment();
                    env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );
                    env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() );
                    env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );

                    Properties properties = new Properties();
                    properties.put("drools.processInstanceManagerFactory", "org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory");
                    properties.put("drools.processSignalManagerFactory", "org.jbpm.persistence.processinstance.JPASignalManagerFactory");
                    KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);

                    return JPAKnowledgeService.loadStatefulKnowledgeSession(idsession,kbase, config, env);

          }



 unfortunatelly, the user guide do not talk about this enough. i need your help please !!
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