I added a KnowledgeAgentEventListener (Drools 5.6) to a knowledgeagent. My vision is to use one of the listener methods (beforeChangeSetApplied perhaps) to examine the change set and determine if I want to cancel its processing. I see that the documentation states that the event getters return immutable objects. Has anyone attempted this? Is there a way to perform this? Thanks for any insight. -J -- View this message in context: http://drools.46999.n3.nabble.com/Stop-change-set-processing-from-within-... Sent from the Drools: User forum mailing list archive at Nabble.com.