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

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(a)gmail.com&gt;: > 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(a)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(a)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. _______________________________________________ > rules-users mailing list rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > ________________________________ > View this message in context: Re: Problem with JPA session persistence in > Drools Flow (5.0.1) > Sent from the drools - user mailing list archive at Nabble.com. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- - http://salaboy.wordpress.com - http://www.jbug.com.ar - Salatino "Salaboy" Mauricio - _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users