We've upgraded Drools 5.1 to 5.4.0.Final. Everything is great with new incremental build change-set.

However, occasionally we get this error (so far, 2 different stack trace)

java.lang.UnsupportedOperationException
        at org.drools.reteoo.BaseLeftTuple.getObject(BaseLeftTuple.java:589)
        at org.drools.reteoo.RuleTerminalNode.modifyLeftTuple(RuleTerminalNode.java:273)
        at org.drools.reteoo.LeftTupleSource.doModifyLeftTuple(LeftTupleSource.java:297)
        at org.drools.reteoo.AbstractTerminalNode.modifyLeftTuple(AbstractTerminalNode.java:104)
        at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateModifyObject(CompositeLeftTupleSinkAdapter.java:260)
        at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateModifyObject(CompositeLeftTupleSinkAdapter.java:275)
        at org.drools.reteoo.LeftInputAdapterNode.modifyObject(LeftInputAdapterNode.java:170)
        at org.drools.reteoo.SingleObjectSinkAdapter.propagateModifyObject(SingleObjectSinkAdapter.java:68)
        at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
        at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:421)
        at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:314)
        at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:265)
        at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:470)
        at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:370)
        at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:317)
        at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:312)

AND 

java.lang.UnsupportedOperationException
        at org.drools.reteoo.BaseLeftTuple.getPrevious(BaseLeftTuple.java:478)
        at org.drools.core.util.LeftTupleList.remove(LeftTupleList.java:84)
        at org.drools.core.util.LeftTupleList.removeAdd(LeftTupleList.java:65)
        at org.drools.reteoo.JoinNode.modifyLeftTuple(JoinNode.java:302)
        at org.drools.reteoo.LeftTupleSource.doModifyLeftTuple(LeftTupleSource.java:297)
        at org.drools.reteoo.LeftTupleSource.modifyLeftTuple(LeftTupleSource.java:271)
        at org.drools.reteoo.JoinNode.modifyLeftTuple(JoinNode.java:429)
        at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateModifyObject(CompositeLeftTupleSinkAdapter.java:260)
        at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateModifyObject(CompositeLeftTupleSinkAdapter.java:275)
        at org.drools.reteoo.LeftInputAdapterNode.modifyObject(LeftInputAdapterNode.java:170)
        at org.drools.reteoo.SingleObjectSinkAdapter.propagateModifyObject(SingleObjectSinkAdapter.java:68)
        at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
        at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:157)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:421)
        at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:314)
        at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:265)
        at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:470)
        at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:370)
        at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:317)
        at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:312)

I've searched around and saw https://issues.jboss.org/browse/JBRULES-3713. I've downloaded the test program and load our rules but can't reproduce the issue. The similarity between our rules and rules in the test case is that we do have a rule matched and perform an update on the fact.

With my limited knowledge of drools and how it works internally, i've run out of ideas.

SOS, please help!!!

Regards,

Trung

 

	
	
	
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