Hi I have one question and one problem. The question is, is multiple instances of stateful session, thread safe? The problem is, we have a bunch of test cases. Each test class extends from an abstract class in which drools session will be created. Previously we had stateless session so therefore for each test method we had to create a new session and call execute() method. Now because of the huge number of test methods this runs for about 20 minutes. So we decided to change the the session to stateful to make it faster. After this change, many of test cases have ended with assertion failure which doesn't make sense. I don't know what's wrong here, before each test method, we retract any previous fact and we insert new objects. Since jnuit runs tests in multiple threads I thought maybe there is an issue with concurrency. Can anyone please help me on this. Thanks -- View this message in context: http://drools.46999.n3.nabble.com/Concurrent-stateful-knowledge-session-t... Sent from the Drools: User forum mailing list archive at Nabble.com.