Hello there and a happy new year to everyone reading

Why am I here again? Yep, got a problem. Don't know why it doesn't work. I'm using the latest snapshot version.
So here it goes.

A simple rule with conjunction and disjunction but over a set of events.

when
$ldes : Set(size == 2) from collect(LoopDetectorEvent() over window:length(2))
(or LoopDetectorEvent($t1 : transportation == "LKW", $id1 : eventID) from $ldes
LoopDetectorEvent($t2 : transportation == "PKW", $id2 : eventID) from $ldes)
LoopDetectorEvent($t3 : transportation == "BUS", $id3 : eventID) from $ldes

So, what the rule says: fire when there's a BUS event plus either a LKW or PKW event in the set.

But, instead I get a big exception. It's posted at the end.

Interestingly, it works if I don't use the Set, like this...

when
(or $e1 : LoopDetectorEvent($t1 : transportation == "PKW", $id1 : eventID) over window:length(1)
$e2 : LoopDetectorEvent($t2 : transportation == "LKW", $id2 : eventID) over window:length(1))
LoopDetectorEvent($t3 : transportation == "BUS", $id3 : eventID) over window:length(1)

but that rule does not have the same meaning. So it's useless for me.
Besides, it DOES work with the set if I just cut the third event out (the BUS event).

What is wrong here?

Thanks in advance.
Kind regards!
Oliver

Exception in thread "Thread-2" java.lang.ClassCastException: org.drools.reteoo.InitialFactImpl cannot be cast to trafficsys.domain.events.LoopDetectorEvent
at org.drools.base.trafficsys.domain.events.LoopDetectorEvent446196$getTransportation.getValue(Unknown Source)
at org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:91)
at org.drools.base.evaluators.EqualityEvaluatorsDefinition$StringEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1961)
at org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:92)
at org.drools.rule.LiteralConstraint.isAllowed(LiteralConstraint.java:109)
at org.drools.reteoo.FromNode.checkConstraintsAndPropagate(FromNode.java:264)
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.FromNode.checkConstraintsAndPropagate(FromNode.java:279)
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.assertObject(AccumulateNode.java:270)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:450)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:378)
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:1187)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1089)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:893)
at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:238)
at trafficsys.SessionInterface.insertAndFire(SessionInterface.java:133)