[rules-users] UnsupportedOperationException intermitently

[erolagnab]

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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