We are using drools with spring jpa configuration as recommended. Things work fine with a single thread, but, when we hit our service with multiple requests, we get a IllegalStateException - Transaction already active exception. Quick googling resulted in some references in spring docs, where they say that multi threaded access to entitymanager causes these exceptions. I am not sure if anyone else faced this problem. Using bitronix with spring JPA in Tomcat. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Drools-Spring-JPA-Ill... Sent from the Drools - User mailing list archive at Nabble.com.