I have a RulesEngine class which consists of single instance of a WorkingMemory and the RuleBase. In my application two threads access the working memory concurrently and assert/modify/retract my business objects (of same type/class). What will happen if one of the thread fires a rule which retracts an object while the other thread is working on that object? So my question is whether drools provide thread safety on the objects in working memory or do i need to handle it on my own by not allowing threads to access working memory at the same time. -- View this message in context: http://www.nabble.com/Thread-safety-of-objects-in-working-memory-tf324402... Sent from the drools - user mailing list archive at Nabble.com.