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Re: How do you implement data persistence in jbpm5 and simulate multiple trials in between nodes?
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created by <a href="https://community.jboss.org/people/binglim">Bing Lim</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/749717#749717">View the full discussion</a>
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<div class="jive-rendered-content"><p>Thanks a lot for the reply.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>1) Below is the error message I get from running the example:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  23/07 14:25:55,418[main] ERROR hibernate.impl.SessionFactoryImpl.<init>  - Error in named query: ProcessInstancesWaitingForEvent</p><p>org.hibernate.hql.ast.QuerySyntaxException: ProcessInstanceInfo is not mapped [select processInstanceInfo.processInstanceId from ProcessInstanceInfo processInstanceInfo where :type in elements(processInstanceInfo.eventTypes)]</p><p>          at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:181)</p><p>          at org.hibernate.hql.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:110)</p><p>          at org.hibernate.hql.ast.tree.FromClause.addFromElement(FromClause.java:94)</p><p>          at org.hibernate.hql.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:316)</p><p>          at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3228)</p><p>          at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3112)</p><p>          at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:720)</p><p>          at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:571)</p><p>          at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:288)</p><p>          at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:231)</p><p>          at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254)</p><p>          at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)</p><p>          at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)</p><p>          at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)</p><p>          at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)</p><p>          at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)</p><p>          at org.hibernate.impl.SessionFactoryImpl.checkNamedQueries(SessionFactoryImpl.java:484)</p><p>          at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:394)</p><p>          at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1341)</p><p>          at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)</p><p>          at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)</p><p>          at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)</p><p>          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)</p><p>          at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)</p><p>          at com.sample.HelloProcessTest.main(HelloProcessTest.java:43)</p><p>javax.persistence.PersistenceException: [PersistenceUnit: org.jbpm.task] Unable to build EntityManagerFactory</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Aside from this example, is there an easier way to implement database persistence?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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. </p><p>    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. </p><p>    Is there a specific node that can implement that function?  </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>3) Is it possible to get ksession from an external process without passing in the StatefulKnowledgeBaseSession as a parameter? <br/>    To do signaling from an external source, I need to execute <a class="jive-link-anchor-small"><p style="display: inline !important;"><span class="java_plain" style="color: #000000;">ksession</span><span class="java_separator" style="color: #000000;">.</span><span class="java_plain" style="color: #000000;">signalEvent</span><span class="java_separator" style="color: #000000;">(</span><span class="java_plain" style="color: #000000;">type</span><span class="java_separator" style="color: #000000;">,</span><span class="java_plain" style="color: #000000;"> eventData</span><span class="java_separator" style="color: #000000;">);</span></p></a></p><p>    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? </p></div>
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