6:34 p.m.
[
https://jira.jboss.org/browse/JBRULES-2735?page=com.atlassian.jira.plugin...
]
Will Lauer commented on JBRULES-2735:
-------------------------------------
It looks like this is a problem with the handling of "from collect" when
combined with event facts. When a rule with "from collect" is evaluated, it
eventually calls RetooFactHandleFactory.newFactHandle(), passing in null for the
ObjectTypeConf, making the factory assume that the fact to be constructed is a default
fact type, not an event fact. The result is that facts inserted into a collection using
"from collect" will have morphed their role. If these facts are later used in
another clause in the rule (for example, through using the "from" clause on a
rule) and temporal reasoning is applied to them, a type mismatch will occur and a casting
exception will be generated.
Looks like the offending null is coming from FromNode.assertLeftTuple(). Here, a call is
made to workingMemory.getFactHandleFactory().newFactHandle(...) with null being passed
instead of the correct confType being looked up. There is a comment here indicating that
the null is intentional. Seems like there is a disconnect here with the event
functionality.
ClassCastException for casting DefaultFactHandle to EventFactHandle
when using Sliding Windows
----------------------------------------------------------------------------------------------
Key: JBRULES-2735
URL: https://jira.jboss.org/browse/JBRULES-2735
Project: Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: drools-core (fusion)
Affects Versions: 5.1.1.FINAL
Environment: Windows XP SP3, Java 1.6.0_21, Drools 5.1.1
Reporter: Will Lauer
Assignee: Mark Proctor
When playing with a simple sliding window test using a single type of fact with
@role(event), the following ClassCastException is generated:
Exception in thread "main" java.lang.ClassCastException:
org.drools.common.DefaultFactHandle cannot be cast to org.drools.common.EventFactHandle
at
org.drools.base.evaluators.BeforeEvaluatorDefinition$BeforeEvaluator.evaluateCachedLeft(BeforeEvaluatorDefinition.java:333)
at
org.drools.rule.VariableRestriction.isAllowedCachedLeft(VariableRestriction.java:110)
at
org.drools.rule.VariableConstraint.isAllowedCachedLeft(VariableConstraint.java:115)
at
org.drools.common.SingleBetaConstraints.isAllowedCachedLeft(SingleBetaConstraints.java:142)
at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:274)
at org.drools.reteoo.FromNode.assertLeftTuple(FromNode.java:138)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:189)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:64)
at
org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:662)
at org.drools.reteoo.AccumulateNode.assertLeftTuple(AccumulateNode.java:181)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:189)
at
org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:138)
at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:148)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:368)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251)
at
net.wlauer.DroolsEngine.NonSpringRulesEngine.main(NonSpringRulesEngine.java:71)
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