Hi, I have noticed that StatelessKnowledgeSessionImpl.execute (5.1.0.M1) methods do not call dispose() method in contrary to the documentation (http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/ht...) 3.3.7. StatelessKnowledgeSession The StatelessKnowledgeSession wraps the StatefulKnowledgeSession, instead of extending it. Its main focus is on decision service type scenarios. It avoids the need to call dispose(). Stateless sessions do not support iterative insertions and the method call fireAllRules() from Java code; the act of calling execute() is a single-shot method that will internally instantiate a StatefulKnowledgeSession, add all the user data and execute user commands, call fireAllRules(), and then call dispose(). Is this a bug or has something changed between version 5.0.1 and 5.1.0 ? BR, Savvas Triantafyllou