11 a.m.
[
https://jira.jboss.org/jira/browse/JBRULES-2278?page=com.atlassian.jira.p...
]
Edson Tirelli commented on JBRULES-2278:
----------------------------------------
Ok, you are using drools 5.0.1. So I switched my project to use drools 5.0.1. I ran your
temporal test, let it fire the rule a few times, made a change in the DRL file, let it
update and fire the rules again. No problem in my environment. Log snippet:
(...)
[2009:12:337 11:12:674:debug] ResourceChangeScanner attempt to scan 1 resources
[2009:12:337 11:12:674:debug] ResourceChangeScanner thread is waiting for 10
******************** Temporal Rule Fired Thu Dec 03 11:57:02 EST 2009
******************** Temporal Rule Fired
******************** Temporal Rule Fired Thu Dec 03 11:57:07 EST 2009
******************** Temporal Rule Fired
[2009:12:337 11:12:674:debug] ResourceChangeScanner attempt to scan 1 resources
[2009:12:337 11:12:675:debug] ResourceChangeScanner modified resource=[UrlResource
path='file:src/main/resources/cepRule.drl'] : 1259859088237 : 1259859440113
[2009:12:337 11:12:676:debug] ResourceChangeNotification received ChangeSet notification
[2009:12:337 11:12:676:debug] ResourceChangeScanner thread is waiting for 10
[2009:12:337 11:12:676:debug] ResourceChangeNotification processing ChangeSet
[2009:12:337 11:12:677:debug] ResourceChangeNotification ChangeSet modified
resource=[UrlResource path='file:src/main/resources/cepRule.drl'] for
listener=org.drools.agent.impl.KnowledgeAgentImpl@1e45a5c
[2009:12:337 11:12:677:debug] ResourceChangeNotification ChangeSet modified
resource=[UrlResource path='file:src/main/resources/cepRule.drl'] for
listener=kagent.test.changeset.notifficator.DroolsEngineResourceNotifier@1954f89
[2009:12:337 11:12:677:debug] KnowledgeAgent received ChangeSet changed notification
[2009:12:337 11:12:677:info] KnowledgAgent applying ChangeSet
[2009:12:337 11:12:677:debug] KnowledgeAgent ChangeSet requires KnowledgeBuilder
[2009:12:337 11:12:678:debug] KnowledgeAgent rebuilding KnowledgeBase using ChangeSet
[2009:12:337 11:12:685:debug] KnowledgeAgent building resource=[UrlResource
path='file:src/main/resources/cepRule.drl']
[2009:12:337 11:12:872:info] KnowledgeAgent new KnowledgeBase now built and in use
******************** Temporal Rule Fired Thu Dec 03 11:57:12 EST 2009
******************** Temporal Rule Fired
******************** Temporal Rule Fired Thu Dec 03 11:57:17 EST 2009
******************** Temporal Rule Fired
[2009:12:337 11:12:676:debug] ResourceChangeScanner attempt to scan 1 resources
*************** Updating KSession
[2009:12:337 11:12:677:debug] ResourceChangeScanner thread is waiting for 10
*************** #Rule:1
[2009:12:337 11:12:679:debug] ResourceChangeNotification thread is waiting for queue
update
******************** Temporal Rule Fired Thu Dec 03 11:57:22 EST 2009
******************** Temporal Rule Fired
******************** Temporal Rule Fired Thu Dec 03 11:57:27 EST 2009
******************** Temporal Rule Fired
[2009:12:337 11:12:677:debug] ResourceChangeScanner attempt to scan 1 resources
[2009:12:337 11:12:678:debug] ResourceChangeScanner thread is waiting for 10
(...)
Edson
NPE after knowledgebase updated when using entrypoints
------------------------------------------------------
Key: JBRULES-2278
URL: https://jira.jboss.org/jira/browse/JBRULES-2278
Project: Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: drools-core, drools-core (expert), drools-core (fusion)
Affects Versions: 5.0.1.FINAL
Reporter: Michael Neale
Assignee: Edson Tirelli
Fix For: 5.1.0.M2
Attachments: kagent-problem.zip
Raised by Nestor Burriel on the dev list:
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
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