[rules-users] Unable to resolve class x for identifier y

[Wolfgang Laun]

Could be a bug.

Do you have a rule containing a pattern
   NormalizedNamedEntity( this ... )
or similar? Or a trace showing which rule fires, and what it inserts?
If not, add logging - without this info it's hopeless.

-W


On 05/07/2013, Bojan Janisch <bojan.janisch at scai.fraunhofer.de> wrote:
> Hey everyone,
>
> I'm using Drools in a multithreaded environment where multiple
> KnowledgeBuilder and StatefulKnowledgeSessions are created parallel. Until
> now everything runs smooth, but suddenly I got this error:
>
> Exception in thread "ECJ Evaluation Thread 5"
> org.drools.RuntimeDroolsException: Unable to resolve class
> 'de.fraunhofer.scai.bio.extraction.types.text.NormalizedNamedEntity' for
> identifier 'this
> 	at
> org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:231)
> 	at
> org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)
> 	at
> org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)
> 	at
> org.drools.rule.constraint.MvelConstraint.isAllowedCachedLeft(MvelConstraint.java:169)
> 	at
> org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:125)
> 	at org.drools.reteoo.JoinNode.propagateFromLeft(JoinNode.java:105)
> 	at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:95)
> 	at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
> 	at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
> 	at org.drools.reteoo.JoinNode.propagateFromRight(JoinNode.java:159)
> 	at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:148)
> 	at
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
> 	at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:141)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
> 	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
> 	at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
> 	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
> 	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
> 	at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
> 	at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
> 	at
> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
> 	at rulevolution.RulEvolution.runDrools(RulEvolution.java:310)
> 	at rulevolution.RulEvolution.evaluate(RulEvolution.java:161)
> 	at ec.simple.SimpleEvaluator.evalPopChunk(SimpleEvaluator.java:259)
> 	at
> ec.simple.SimpleEvaluator$SimpleEvaluatorThreadCG.run(SimpleEvaluator.java:341)
> 	at ec.util.ThreadPool$PoolThread.run(ThreadPool.java:57)
>
> I don't know why it happened, my program already ran for about 15 minutes.
> Could someone explain me what could cause such an error? I didn't find much
> information about it in the internet.
>
> Thanks and greetings
>
> Bojan
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