Hi Ron, yes I do create a new working memory each time. In the middle of testing the change, I'll let you know the outcome. Cheers, Matt. ________________________________ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Ronald R. DiFrango Sent: Tuesday, 24 April 2007 4:25 AM To: Rules Users List Subject: Re: [rules-users] Potential memory problems Matt, I am sure that would work, but I wonder are you building a new working memory each time as well? If not then maybe you should. My methods always look something like the following: { final WorkingMemory workingMemory = ruleBase.newWorkingMemory(); // Assert my objects workingMemory.assertObject(object); // Fire the rules workingMemory.fireAllRules(); // Return what ever you need to return result; } That way WorkingMemory is thrown away each time. Also, it is fairly low overhead to create one each time. Especially given that you clear and dispose each. Ron On 4/23/07, Matthew Shaw <mshaw(a)emergency.qld.gov.au&gt; wrote: Hi, I am fronting my rule engine by a stateless session façade bean, running in a weblogic container. The rule bases are loaded only once via a singleton. I was running a profiler over the app and have noticed a lot of rule engine objects still attached to the tree. My stub which invokes the working memory looks like the following: try { handle = wm.assertObject(shift); wm.assertObject(shiftCalculator); wm.fireAllRules(); } catch (RuntimeDroolsException e) { throw new TimesheetServiceUnavailableException( "Could not add shift to Working Memory", e); } wm.clearAgenda(); wm.dispose(); LoggingUtils.logMethodFinish(logger, methodName); As you can see if an exception occurs then the dispose method is not run. Could this lead to memory leakage? I have subsequently modified the offending stub to include a finally block finally { wm.clearAgenda(); wm.dispose(); LoggingUtils.logMethodFinish( logger, methodName); } Matt Shaw Snr Applications Developer Service Performance & Management Unit Phone: 3247 8666. ext. 94666 This correspondence is for the named persons only. It may contain confidential or privileged information or both. No confidentiality or privilege is waived or lost by any mis transmission. If you receive this correspondence in error please delete it from your system immediately and notify the sender. You must not disclose, copy or relay on any part of this correspondence, if you are not the intended recipient. Any opinions expressed in this message are those of the individual sender except where the sender expressly, and with the authority, states them to be the opinions of the Department of Emergency Services, Queensland. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This correspondence is for the named persons only. It may contain confidential or privileged information or both. No confidentiality or privilege is waived or lost by any mis transmission. If you receive this correspondence in error please delete it from your system immediately and notify the sender. You must not disclose, copy or relay on any part of this correspondence, if you are not the intended recipient. Any opinions expressed in this message are those of the individual sender except where the sender expressly, and with the authority, states them to be the opinions of the Department of Emergency Services, Queensland.