[rules-users] Exception executing predicate

Hi all, When exceptions occur during runtime of drools, is there a list of things to see to understand what may be causing this to happen ? I know it is a very generic question. I want to see if there is a methodical way to understand what to look for ?. org.drools.RuntimeDroolsException: Exception executing predicate com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.Rule_Cisco_Systems_0ReturnValue0Invoker@39d31fda INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:197) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:122) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject( CompositeObjectSinkAdapter.java:317) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject( SingleObjectSinkAdapter.java:20) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.Rete.assertObject( Rete.java:168) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java :848) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java :822) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java :60) INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java :54) Any help is appreciated ? thanks, Krishnan. -- Sivaramakrishna Iyer Krishnan (Anand) Never assume the obvious is true. - William Safire