[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1351) Rules not firing in heavely threaded application

Rules not firing in heavely threaded application ------------------------------------------------ Key: JBRULES-1351 URL: http://jira.jboss.com/jira/browse/JBRULES-1351 Project: JBoss Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 4.0.2, 4.0.3 Reporter: paata lominadze Server application loads precompiled rule package into memory then it creates as many rulebases as much threads are there. (every thread has its own rulebase and stateless session) application receives messages, then it dispatches it to one of the threads. thread itself executes rules on its own stateless session. rules are written such a way so that at least one rule should fire. but sometimes rules don't fire. in such situations we are passing same facts to rules engine second time, on the same rulebase, using same stateless session. this time one rule is selected. facts are not modified during two runs. they also dont change from rules. this makes us to think that the bug is in rules engine, not in the application rule design logic. going from stateless to stateful session didnot solve this problem fact shadowing is disabled rules have unique salience. all rules belong to same activation group. we had one rulebase for all the threads and were creating one stateless session per thread. but "misfiring" did happen much often this way. giving each thread its own rulebase reduced "misfirings" dramatically this bug started to appear after upgrading from 3.0.5 to 4.0.x, currently we are using 4.0.3 i think this problem has same roots as this bug: http://jira.jboss.org/jira/browse/JBRULES-1330 UPDATE: here is someone having exactly same problem: http://www.nabble.com/Multithreading-use-of-RuleBase.newStatefulSession-o... author of above post also managed to attach sample code with example scenario where the problem occurs