Greetings: Nobody seems to be replying and I'm not really "qualified" to reply but I might be able to point you in the right direction. Long, long ago in a land far, far away we did a really cool project using Intelligent Agents and employed most of the technology from FIPA, The Foundation for Intelligent Physical Agents; see http://www.fipa.org/ for more information. SDG James Owen Founder October Rules Fest Senior Consultant / Architect KBSC http://www.kbsc.com http://www.OctoberRulesFest.org Twitter: OctRulesFest Blogs: http://JavaRules.blogspot.com [Rulebased Systems Blog] http://ORF2009.blogspot.com [October Rules Fest Blog] http://exscg.blogspot.com/ [Expert Systems Consulting Group Blog] "If I have seen a little further it is by standing on the shoulders of giants." Sir Isaac Newton in a letter to Robert Hooke, 5 Feb 1676 Come to October Rules Fest and stand on the shoulders of the Giants of the industry; if only for a week. On Aug 26, 2009, at 11:34 AM, nestabur wrote: > > > Does anyone tried to use the knowledgeAgent with statefulSessions? > > I've tried to configure my rule engine obtaining unexpected behaviour. > > I configure my statefulSession as follows: > > wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent > .getKnowledgeBase()).ruleBase.newStatefulSession( > (SessionConfiguration) sessionConf, env); > ksession = new StatefulKnowledgeSessionImpl(wm, > kagent.getKnowledgeBase()); > > And after updating the KnowledgeBase in the agent I update my > ksession: > > wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent > .getKnowledgeBase()).ruleBase); > ksession = new StatefulKnowledgeSessionImpl(wm, > kagent.getKnowledgeBase()); > > Without using entry-points this approach works as expected, but > using them > it fails after the first update throwing the error: > > Exception while processing message: java.lang.NullPointerException > java.lang.NullPointerException > at > org > .drools > .reteoo > .ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java: > 54) > at > org > .drools > .common > .AbstractFactHandleFactory > .newFactHandle(AbstractFactHandleFactory.java:79) > at > org > .drools > .common > .AbstractFactHandleFactory > .newFactHandle(AbstractFactHandleFactory.java:66) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28) > > Browsing the drools core code I found the line that was throwing the > exception and tried to get the same result by implementing: > > if (!((InternalRuleBase) ((KnowledgeBaseImpl) > ksession.getKnowledgeBase()).ruleBase) > .getTypeDeclaration(fact.getClass()) == null) > log.info (((InternalRuleBase) ((KnowledgeBaseImpl) > ksession.getKnowledgeBase()).ruleBase) > > .getTypeDeclaration > (fact.getClass()).getTimestampExtractor().toString()); > > after updating my ksession. The result was the same, again the same > exception thrown but my logger wrote: > 18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact > field=myTimestampField] > > So I dont know why the core is throwing that exception, is that > implementation correct?, any ideas? > > > Thanks, > > Nestor > > -- > View this message in context: > http://www.nabble.com/Using-KnowledgeAgent-with-Stateful-session-tp251514... > 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 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Greetings: [With Permission] Both Mark Proctor and Edson Tirelli will be speaking at October Rules Fest again this year. And those are just two of the really outstanding speakers this year. Check out the web site for all of the speakers, topics, and other information. Hopefully all is well wherever you are located these days. I just noticed that our Web Mistress (Chelanie) put a quote along with the rotating photos on the front page of our web site. In effect it says that October Rules Fest is "... the main tech-centric event in the industry." Perhaps that sums it all up in a nutshell. All of the others BRMS or Rulebase conferences are strictly business-related or they are totally academic-centric. ORF is, to my knowledge, the only "industry-related" conference on rulebased systems that is technical in nature and is done in the spirit of an academic conference. As such, we tend to draw highly technical attendees and, to some degree, technical CxOs and technical managers who are looking for high-end skill level rulebase personnel to help them with their problems. We are NOT a job mart, but, at times, it seems to be working out that way. We have received the first flurry of White Papers and they are really quite good - OK, they're outstanding! Remember, these will be available *only* at the conference or to attendees and speakers (upon request) for six months after the conference. Also, we will be video taping the conference for the attendees and speakers only. We are way ahead of last year in terms of attendees so be sure to sign up soon to ensure that you have a seat at the table. Also, The Adolphus is filling our ORF room allotment up as well so you need to sign up there quickly. If you have any problems with either of these signup places, please contact either myself or Chelanie. SDG James Owen Founder October Rules Fest Senior Consultant / Architect KBSC http://www.kbsc.com http://www.OctoberRulesFest.org Twitter: OctRulesFest Blogs: http://JavaRules.blogspot.com [Rulebased Systems Blog] http://ORF2009.blogspot.com [October Rules Fest Blog] http://exscg.blogspot.com/ [Expert Systems Consulting Group Blog] *"If I have seen a little further it is by standing on the shoulders of giants."* *Sir Isaac Newton in a letter to Robert Hooke, 5 Feb 1676* * * *Come to October Rules Fest and stand on the shoulders of the Giants of the industry; if only for a week.* _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users