[rules-users] Problem with JPA session persistence in Drools Flow (5.0.1)

[Mauricio Salatino]

Ok, I will try to take a look at it.. this week..
I will let you know if I can fix it

2009/7/28 DroolsUser <rafiuddin.mk at gmail.com>:
> Mark / salaboy, I am also facing same problem while recreate the session
> from database. Can you advice any alternative, so that I can go forward till
> the next release. Moreover when is the new release is ....... Do new release
> will targeting this kind problem? Please suggest any alternative to recreate
> the session from db. Thanks in advance......
>
> gairey wrote:
> Mark, Done: https://jira.jboss.org/jira/browse/JBRULES-2199 - thanks for the
> quick response. Regards, Alan Mark Proctor Sent by:
> rules-users-bounces at lists.jboss.org 08/07/2009 13:49 Please respond to Rules
> Users List To Rules Users List cc Subject Re: [rules-users] Problem with JPA
> session persistence in Drools Flow (5.0.1) Can you open a JIRA for this, and
> we'll make sure it's done in the next few weeks:
> https://jira.jboss.org/jira/browse/JBRULES thanks Mark
> Alan.Gairey at tessella.com wrote: I'm currently using Drools Flow with JPA
> session persistence enabled as described in section 5.1 of the User Guide.
> As a process executes, session information is saved to the H2 database
> correctly. The problem comes if a process only executes part way through,
> and I then try to finish the process by recreating a session using the code:
> // recreate the session from database using the sessionId ksession =
> JPAKnowledgeService.loadStatefulKnowledgeSession( sessionId, kbase, null,
> env ); This gives me a NullPointerException. Having looked into the Drools
> Flow source code, I think the problem is in the class
> drools-persistence-jpa\src\main\java\org\drools\persistence\session\SingleSessionCommandService.java.
> The 4th constructor of this class is called as part of the loading of a
> knowledge session from the H2 database; this in turn leads to the
> afterCompletion method of the inner class SynchronizationImpl being called.
> The final two lines of this method are: ((JPAProcessInstanceManager)
> ((ReteooWorkingMemory)
> session).getProcessInstanceManager()).clearProcessInstances();
> ((JPAWorkItemManager) ((ReteooWorkingMemory)
> session).getWorkItemManager()).clearWorkItems(); However, when called via
> the route described above, the session member variable of
> SingleSessionCommandService has not been set, thus causing the
> NullPointerException. (Interestingly, running the unit tests for
> drools-persistence-jpa does result in the NullPointerException being thrown
> multiple times, although the tests are still listed as having passed.) I
> believe enclosing the above two lines as follows will fix the problem: if
> (session != null) { ((JPAProcessInstanceManager) ((ReteooWorkingMemory)
> session).getProcessInstanceManager()).clearProcessInstances();
> ((JPAWorkItemManager) ((ReteooWorkingMemory)
> session).getWorkItemManager()).clearWorkItems(); } Also, in the 4th
> constructor of SingleSessionCommandService, after the session has been set,
> the following line needs to be added to ensure the session id is the same as
> the session info id: ((ReteooStatefulSession) this.session).setId(
> this.sessionInfo.getId() ); (This line is present at the end of the 3rd
> constructor.) It would be great if this fix could make it into the Drools
> 5.1 release. Thanks. _______________________________________________
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