Rule activation error using length sliding window ------------------------------------------------- Key: JBRULES-3662 URL: https://issues.jboss.org/browse/JBRULES-3662 Project: JBRULES Issue Type: Bug Security Level: Public(Everyone can see) Components: drools-core Affects Versions: 5.3.0.Final, 5.4.0.Final, 5.5.0.Beta1 Environment: Mac OS X, running Apple Java 1.6, Maven2, Eclipse Juno Reporter: Vítor Moreira Assignee: Mark Proctor Fix For: 6.0.0.Alpha1 Attachments: droolsTest.zip When using "window:length", some rules are activated twice, when it should be only activated once. The uploaded example reproduces the error: we insert Transactions, which has a field "problem" inside: 1 for problem, 0 for OK. The rules calculates the percent of transactions with problems. If the percentage>=40%, raises an alarm. If it's below 40%, removes the alarm (if there's an alarm). There is a minimum of 5 transactions to trigger/rearm. The test case simulates a raise to 40% (alarm is trigged), continues high (until 60%) and starts to fall down to 20% (alarm is removed). Drools version 5.2.0.Final: alarm is trigged *once*, removed *once* Drools version 5.3.0.Final: alarm is trigged *once*, removed *twice* Drools version 5.4.0.Final: alarm is trigged *once*, removed *twice* Drools version 5.5.0.Beta1: alarm is trigged *once*, removed *twice* Since there's only one alarm and drools tries to remove twice, there's a NullPointerException. *NOTE:* the attached zip file has code to test issue 3564 because I first though that could be a reopen issue but no, it's not the same issue (issue 3564 is resolved in 5.5.0.Beta1). *NOTE2:* I don't know if it's related to issue 3201...