[rules-users] Listen event in different package

[Marco Malziotti]

Hello
I am a beginner in Drools 5.1.1 and try to listen a event in a packageX 
inserted by a rule in another packageY.
I have following 2 drl file :

---inserter.drl----
package packageY
import internal.event.*;

declare EventItem
   @role (event)
end

rule "insert EventItem"
when
   ...
then
   EventItem ei = new EventItem(...);
   insert(ei);
end
----------------

---listener.drl---
package packageX
import internal.event.*;

rule "listen EventItem temporal constraint"
when
   ei: EventItem()
   oi: OtherItem(this after ei)
then
   System.out.println("Hello word");
end
----------------

EventItem and OtherItem are defined in 'internal.event' package.
If I run with a StatefulKnowledgeSession configured in 'pseudo clock', 
I have following stack trace:

java.lang.ClassCastException: org.drools.common.DefaultFactHandle 
cannot be cast to org.drools.common.EventFactHandle
at 
org.drools.base.evaluators.AfterEvaluatorDefinition$AfterEvaluator.evaluateCachedRight(AfterEvaluatorDefinition.java:322)
at 
org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:117)
at 
org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:121)
at 
org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:151)
at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:125)
at 
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145)
at 
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
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)
...

Moving listener.drl in packageY, all works.
I don't know if it is already open a related issue, perhaps the :
https://issues.jboss.org/browse/JBRULES-2774
Thanks for your attention.
Regards.

Marco Malziotti
Tecnologie nelle Reti e nei Sistemi T.R.S. S.p.A.
Integration Test Engineer
Tel.  + 39 06.87281.407
Fax.  + 39 06.87281.550
E-mail: marco.malziotti at trs.it


Tecnologie nelle Reti e nei Sistemi T.R.S. SpA
Via della Bufalotta, 378 - 00139 Roma
Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550

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