[rules-users] Persistence in fireUntilHalt() loop

[Alberto R. Galdo]

Any info on the subject?

Does anyone suffers the same problem?

Anyone doing persistence on a fireUnitHalt loop?


Alberto R. Galdo
argaldo at gmail.com

On Thu, Mar 8, 2012 at 11:32, Alberto R. Galdo <argaldo at gmail.com> wrote:

> Hi,
>
>   We're running an application that uses Drools + JBPM 5 + Drools
> integration our set-up can be seen as:
>
>   Some rule fires and creates a JBPM process ( a fact gets inserted into
> drools using "kcontext.getKnowledgeRuntime().startProcess("testProcess")"
> ). We have a problem with the persistence of this processes. Persistence is
> implemented with JPA and JTA. Our application runs with fireUntilHalt() and
> when a process is launched from the consequence of any of the rules the
> persistence of the process fails. If the application runs with
> fireAllRules(), the persistence works like a charm.
>
>   The error shown is as follow:
>
>   Exception in thread "Thread-5" Exception executing consequence for rule
> "Run Process" in com.sample: java.lang.NullPointerException
> at
> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>  at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
> at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
>  at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1229)
> at
> org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:754)
>  at
> org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:730)
> at
> org.drools.command.runtime.rule.FireUntilHaltCommand$1.run(FireUntilHaltCommand.java:50)
>  at java.lang.Thread.run(Thread.java:662)
> Caused by: java.lang.NullPointerException
> at
> org.jbpm.persistence.processinstance.JPAProcessInstanceManager.addProcessInstance(JPAProcessInstanceManager.java:44)
>  at
> org.jbpm.process.instance.AbstractProcessInstanceFactory.createProcessInstance(AbstractProcessInstanceFactory.java:36)
> at
> org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:182)
>  at
> org.jbpm.process.instance.ProcessRuntimeImpl.createProcessInstance(ProcessRuntimeImpl.java:154)
> at
> org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:135)
>  at
> org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:130)
> at
> org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1074)
>  at
> org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:301)
> at com.sample.Rule_Run_Process.defaultConsequence(Rule_Run_Process.java:9)
>  at com.sample.Rule_Run_ProcessDefaultConsequenceInvoker.evaluate(Unknown
> Source)
> at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
>  ... 6 more
>  The problem is in this function:
>  public void addProcessInstance(ProcessInstance processInstance) {
>         ProcessInstanceInfo processInstanceInfo = new ProcessInstanceInfo(
> processInstance, this.kruntime.getEnvironment() );
>         ProcessPersistenceContext context
>             = ((ProcessPersistenceContextManager)
> this.kruntime.getEnvironment()
>                     .get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER ))
>                     .getProcessPersistenceContext();
>         // @PrePersist added to ProcessInstanceInfo because of this
>         context.persist( processInstanceInfo );
>         ((org.jbpm.process.instance.ProcessInstance)
> processInstance).setId( processInstanceInfo.getId() );
>         processInstanceInfo.updateLastReadDate();
>         internalAddProcessInstance(processInstance);
>     }
>  We think after that persist sentence, the entity manager would have to
> run a flush sentence for the process instance is inserted into database and
> get the ID.
>  Greets.
>
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