[jboss-user] [jBPM] - Re: How do you implement data persistence in jbpm5 and simulate multiple trials in between nodes?

[Bing Lim]

Bing Lim [https://community.jboss.org/people/binglim] created the discussion

"Re: How do you implement data persistence in jbpm5 and simulate multiple trials in between nodes?"

To view the discussion, visit: https://community.jboss.org/message/749717#749717

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Thanks a lot for the reply.

1) Below is the error message I get from running the example:

  23/07 14:25:55,418[main] ERROR hibernate.impl.SessionFactoryImpl.<init>  - Error in named query: ProcessInstancesWaitingForEvent
org.hibernate.hql.ast.QuerySyntaxException: ProcessInstanceInfo is not mapped [select processInstanceInfo.processInstanceId from ProcessInstanceInfo processInstanceInfo where :type in elements(processInstanceInfo.eventTypes)]
          at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:181)
          at org.hibernate.hql.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:110)
          at org.hibernate.hql.ast.tree.FromClause.addFromElement(FromClause.java:94)
          at org.hibernate.hql.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:316)
          at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3228)
          at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3112)
          at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:720)
          at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:571)
          at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:288)
          at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:231)
          at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254)
          at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)
          at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
          at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
          at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
          at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
          at org.hibernate.impl.SessionFactoryImpl.checkNamedQueries(SessionFactoryImpl.java:484)
          at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:394)
          at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1341)
          at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
          at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
          at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
          at com.sample.HelloProcessTest.main(HelloProcessTest.java:43)
javax.persistence.PersistenceException: [PersistenceUnit: org.jbpm.task] Unable to build EntityManagerFactory


Aside from this example, is there an easier way to implement database persistence?

2) I am designing a worklow process that simulates writing a file to an archive and it is relevant for business, so it would be better if it is easy to understand. 
    When the task exceeds a certain time limit, it will enter a human task to prompt the user if he would like to retry or cancel the task, therefore requires the looping. 
    Is there a specific node that can implement that function?  

3) Is it possible to get ksession from an external process without passing in the StatefulKnowledgeBaseSession as a parameter? 
    To do signaling from an external source, I need to execute ksession.signalEvent(type, eventData);

    But I do not want the external process to know the ksession directly by passing it in as a parameter. So is it possible to obtain the ksession from WorkItem or WorkItemManager?
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