[rules-users] Drools 5.1 - exception when trying to use incremental KB updates.

[Esteban Aliverti]

This is strange. Could you isolate this behavior in a unit test?

Best,

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Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


On Thu, Aug 12, 2010 at 12:22 PM, Stephen Mcgruer <s0840449 at sms.ed.ac.uk>wrote:

> Just moved to Drools 5.1, using a Guvnor package as the base for a
> Knowledge Base with incremental updating enabled. Our resource is a
> Guvnor PKG. We encounter the following error when a snapshot is made:
>
> [2010:08:224 16:08:903:debug] KnowledgeAgent: Diffing: [UrlResource
> path='
> http://localhost:1337/drools-guvnor/org.drools.guvnor.Guvnor/package/TEST/v0.1
> ']
> [2010:08:224 16:08:935:debug] BinaryResourceDiffProducerImpl:
> Comparing [Rule name=Resource Null-Checker, agendaGroup=MAIN,
> salience=0, no-loop=false] against [Rule name=Resource Null-Checker,
> agendaGroup=MAIN, salience=0, no-loop=false]
> Exception in thread "Thread-30" org.drools.RuntimeDroolsException:
> java.lang.reflect.InvocationTargetException : [Rule name=Resource
> Null-Checker, agendaGroup=MAIN, salience=0, no-loop=false]
>        at
> org.drools.core.util.ReflectiveVisitor.visit(ReflectiveVisitor.java:56)
>        at
>
> org.drools.agent.impl.BinaryResourceDiffProducerImpl.diff(BinaryResourceDiffProducerImpl.java:63)
>        at
>
> org.drools.agent.impl.KnowledgeAgentImpl.incrementalBuildResources(KnowledgeAgentImpl.java:785)
>        at
>
> org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:586)
>        at
>
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:185)
>        at
>
> org.drools.agent.impl.KnowledgeAgentImpl$ChangeSetNotificationDetector.run(KnowledgeAgentImpl.java:1106)
>        at java.lang.Thread.run(Unknown Source)
> Caused by: java.lang.reflect.InvocationTargetException
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>        at java.lang.reflect.Method.invoke(Unknown Source)
>        at
> org.drools.core.util.ReflectiveVisitor.visit(ReflectiveVisitor.java:47)
>        ... 6 more
> Caused by: java.lang.RuntimeException: this MVELReturnValueExpression
> must be compiled for equality
>        at
>
> org.drools.base.mvel.MVELReturnValueExpression.equals(MVELReturnValueExpression.java:123)
>        at
>
> org.drools.rule.ReturnValueRestriction.equals(ReturnValueRestriction.java:306)
>        at
>
> org.drools.rule.ReturnValueConstraint.equals(ReturnValueConstraint.java:121)
>        at java.util.Arrays.equals(Unknown Source)
>        at org.drools.rule.OrConstraint.equals(OrConstraint.java:132)
>        at java.util.AbstractList.equals(Unknown Source)
>        at org.drools.rule.Pattern.equals(Pattern.java:317)
>        at org.drools.rule.GroupElement.equals(GroupElement.java:273)
>        at
>
> org.drools.agent.impl.BinaryResourceDiffProducerImpl.compareRules(BinaryResourceDiffProducerImpl.java:258)
>        at
>
> org.drools.agent.impl.BinaryResourceDiffProducerImpl.visitRule(BinaryResourceDiffProducerImpl.java:117)
>        ... 11 more
>
> The rule in question is quite straight-forward, works on the initial
> load up and worked in 5.0.1 fine. It is not the rule that was just
> changed. If I remove that rule, another is just substituted in its
> place in the error message.
>
> What might be causing this? If you need more information, please ask.
>
> Stephen
>
> --
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>
>
>
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