[jboss-jira] [JBoss JIRA] Commented: (JBRULES-2278) NPE after knowledgebase updated when using entrypoints
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https://jira.jboss.org/jira/browse/JBRULES-2278?page=com.atlassian.jira.p...
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Michael Neale commented on JBRULES-2278:
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To go with the attachment:
Hi Michael,
Attached a eclipse project with 2 sample apps showing my problem.
There are 2 main classes, 1 for CEP and STREAM enviroment and other without them.
The extrange behavior is that the engine keeps the Working Memory correctly and does the
changes correctly in the nonTemporal enviroment (ksession.insert()) but at the Temporal
enviroment (ksession.getWorkingMemoryEntryPoint("MyEntryPoint").insert(fact))
keeps the WM and doesnt change the RuleBase.
Both main classes have 1 parameter setting the drl path:
file:src/main/resources/cepRule.drl
file:src/main/resources/nonCepRule.drl
Try execute both enviroments, do changes inside the DRLs and see if the kagent updates the
KSession correctly.
Thanks,
Nestor
PD: Actually I use both enviroments using the Guvnor PKG repository, in the post I wrote
the error thrown if I use Guvnor instead DRL files but is the same problem as the attached
project, the ksession doesnt refresh the KnowledgeBase in my Temporal enviroment.
NPE after knowledgebase updated when using entrypoints
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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.M1
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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