Re: [rules-users] threw error java.lang.ClassCastException: org.drools.reteoo.FromNode$FromMemory cannot be cast to org.drools.reteoo.BetaMemory

Interesting... and great question! are you working with 5.5.0.Final, 5.5.1-SNAPSHOT / 5.6.0-SNAPSHOT or another version? The KB lock/unlock event is, afaik, only fired when a thread acquires a WRITE lock on a KB (e.g. to add or remove rules), while an insertion should only acquire a READ lock, an event which is not fired. If my understanding is correct, the container thread "http-8084-2" animates the RuleRunner and spawns a service thread - 2967417 - to do the actual insertion. Between here: 13/05/08 20:07:16|http-8084-2|RuleRunner|INFO|createModel Request class initialized! and 13/05/08 20:07:16|2967417|RuleRunner|INFO|processRequest Insert into KB ... that thread modifies the KB 4 times. Then, a fifth modification takes place and AFTER that, eventually, the exception manifests. Possibilities: - Are we missing an important part of the logs? - Is the RuleRunner class doing things it shouldn't do, like re-adding the rules to the KB? My understanding is that the KnowledgeBaseAgentImpl is the one modifying the (only) instance of the KB, but that "createModel" is suspicious.... - Do any of your rules trigger a modification of the KB, so that we would have a "callback" from the fireallrules? I guess that seeing the code of the RuleRunner might help... -- View this message in context: http://drools.46999.n3.nabble.com/threw-error-java-lang-ClassCastExceptio... Sent from the Drools: User forum mailing list archive at Nabble.com.