Dynamic update with KieContainer.updateToVersion() not working when ksession was created with config ---------------------------------------------------------------------------------------------------- Key: DROOLS-654 URL: https://issues.jboss.org/browse/DROOLS-654 Project: Drools Issue Type: Bug Affects Versions: 6.1.0.Final, 6.2.0.CR2 Environment: Ubuntu Linux Reporter: Tihomir Meščić Assignee: Mario Fusco Priority: Blocker I'm creating my {{KieSession}} by setting {{STREAM}} as the event processing mode in the configuration: {{KieBaseConfiguration config = KieServices.Factory.get()}} {{.newKieBaseConfiguration();}} {{config.setOption(EventProcessingOption.STREAM);}} {{KieContainer kc = ks.newKieContainer( ... releaseId ... );}} {{KieSession ksession = kc.newKieBase(config).newKieSession();}} After that, everything works fine. But when I try to dynamically update to a new version (containing new rules): {{kc.updateToVersion( ... newReleaseId... );}} It seems like all of the facts are removed from the session, and my rules are no longer triggered. When I do not use the configuration object when creating the session and just use: {{KieSession ksession = kc.newKieSession();}} then, everything works as expected. However, this is not an option because I need a way to specify the processing mode as {{STREAM}} (and this is the only way I know of).