[rules-users] NullPointerException using 2 sliding windows and accumulate functions.

[nw1005]

Hello everybody,
currently I'm facing a problem using sliding windows and accumulate feature
in Drools 5.5.0.Final.
I'm using two sliding windows (window:length) with different lengths on the
same event in the same rule.
It seems that the shorter window retracts events which are not fitting in it
any more,
and accumulate function over the bigger window tries to access the retracted
event with a NullPointerException.

declare Property
	@role(event)
	@timestamp(measuretime)
end

rule "Buggy rule"
when
    Number(doubleValue > 10) from accumulate(Property(propertyname ==
"PROPERTY1", val16: propertyvalue) over window:length(2)
        from entry-point "123" , max(val16))

    Number(doubleValue < 50) from accumulate(Property(propertyname ==
"PROPERTY1", val20: propertyvalue) over window:length(5)
        from entry-point "123" , max(val20))
	
	then
		System.out.println("Rule Match");
end


entryPoint.insert(new Property("PROPERTY1", 20));
session.fireAllRules();
entryPoint.insert(new Property("PROPERTY1", 20));
session.fireAllRules();
entryPoint.insert(new Property("PROPERTY1", 20));
session.fireAllRules();
entryPoint.insert(new Property("PROPERTY1", 2));
session.fireAllRules();
entryPoint.insert(new Property("PROPERTY1", 2));
session.fireAllRules();
entryPoint.insert(new Property("PROPERTY1", 2));

It happens on the last insert.

java.lang.NullPointerException
	at org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:1050)
	at
org.drools.reteoo.AccumulateNode.modifyLeftTuple(AccumulateNode.java:345)
	at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:259)
	at
org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:676)
	at
org.drools.reteoo.ReteooWorkingMemory$EvaluateResultConstraints.execute(ReteooWorkingMemory.java:590)
	at
org.drools.common.PropagationContextImpl.evaluateActionQueue(PropagationContextImpl.java:350)
	at
org.drools.rule.SlidingLengthWindow.assertFact(SlidingLengthWindow.java:119)
	at org.drools.rule.BehaviorManager.assertFact(BehaviorManager.java:94)
	at org.drools.reteoo.WindowNode.assertObject(WindowNode.java:167)
	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.NamedEntryPoint.insert(NamedEntryPoint.java:127)
	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:55)

Is it a bug, or am I doing something completely wrong?





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