Hi James, The kind of agents that I'm using are not the same as you pointed me ;)
I'm just using the agents provided by drools-core for updating the RuleBase. Anyway, thanks for your suggestion. the FIPA technology seems to be great for future projects ;) Thanks for replying, Nestor James Owen-3 wrote: > > 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-tp25151447p25151447.html >> Sent from the drools - user mailing list archive at Nabble.com. >> >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Using-KnowledgeAgent-with-Stateful-session-tp25151447p25167273.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
