Drools cannot be configured to expire Events properly ----------------------------------------------------- Key: DROOLS-1227 URL: https://issues.jboss.org/browse/DROOLS-1227 Project: Drools Issue Type: Bug Affects Versions: 6.2.0.Final Environment: Windows, Java SE 1.8 Reporter: Cristobal Arellano Assignee: Mario Fusco Priority: Critical Attachments: expire_without_temporal_constraint.drl Hello, I want to configure Drools (CEP) to expire events when no longer needed. There are two scenarios: ==SCENARIO A== I configured Event with no explicit expires. In this scenario, if there is a rule with temporal constraints, the expiration is automatically calculated based on the constrains. If there is a rule with no temporal constraints, the expiration is INFINITE. The following example shows the scenario: dialect "mvel" declare Event @role(event) end rule "ExampleRule1" when ( $a : Event(name == "event a") then System.out.println("ExampleRule1Triggered"); end rule "ExampleRule2" when ( $a : Event(name == "event a") ) and ( $b : Event((name == "event b") && (this after [1ms, 15s] $a)) ) then System.out.println("ExampleRule2Triggered"); end With the previous Event definition: * If only ExampleRule1 loaded, expires INFINITE. Expected expires 0. ERROR? * If ExampleRule1 loaded and ExampleRule2 loaded, expires 15s. Expected expires 15. OK! To solve this situation a tried the following scenario: == SCENARIO B== I configured Event with explicit expires. In this scenario, if there is a rule with temporal constraints, the expiration is not taken into account because it is overriden by the explicit expires. The following example shows the scenario: dialect "mvel" declare Event @role(event) @expires(0s) end rule "ExampleRule1" when ( $a : Event(name == "event a") then System.out.println("ExampleRule1Triggered"); end rule "ExampleRule2" when ( $a : Event(name == "event a") ) and ( $b : Event((name == "event b") && (this after [1ms, 15s] $a)) ) then System.out.println("ExampleRule2Triggered"); end With the previous Event definition: * ExampleRule1 is triggered and event removed. OK! * ExampleRule2 is not triggered inserting two events because the first one expires. ERROR? I suppose that SCENARIO B is not factible because explicit expires overrides implicit expires (according to issue DROOLS-586). Could you please help me to solve this situation? Should Drools set inferred expiration time to 1ms when there are rules with no temporal constraints?