"from" does not work correctly with events in STREAM mode --------------------------------------------------------- Key: JBRULES-2423 URL: https://issues.jboss.org/browse/JBRULES-2423 Project: JBRULES Issue Type: Bug Security Level: Public(Everyone can see) Components: drools-core (fusion) Affects Versions: 5.0.0.M1 Environment: Drools Fusion 5.0+ with engine in STREAM mode Reporter: Davide Sottara Assignee: Edson Tirelli Priority: Critical Labels: from, fusion, stream Fix For: 5.5.0.Final In the simple test case below, Message is an instantaneous event (i.e. duration = 0) with a list of destinations. -------------------------------------------------------------------------------------------------------------------------------------- declare Message @role( event ) @timestamp(start) @duration(duration) end rule "Hello World" when m : Message( status == Message.HELLO, $myMessage : message, $destinations : dest) $s : String() from $destinations then System.out.println( "Dear " + $s + " : >>> " + $myMessage ); end -------------------------------------------------------------------------------------------------------------------------------------- if the engine is configured to work in STREAM mode, the output is Dear NULL :>>> Hello World ... since the Strings extracted from the Collection "dest" have already been retracted by the time the rule is fired, following the retraction of the Message event. The problem does not show in CLOUD mode.