Rules will only fire in the first session created from a knowledgebase - Segment Memory restore from Prototype conflict ----------------------------------------------------------------------------------------------------------------------- Key: DROOLS-339 URL: https://issues.jboss.org/browse/DROOLS-339 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 6.0.0.CR5 Reporter: Davide Sottara Assignee: Mario Fusco Priority: Blocker Fix For: 6.0.1.Final Given a KB with the two rules below: {code} rule "Insert Info " when then insert( "aaa " ); insert( new Integer( 12 ) ); insert( new Double( 4.0 ) ); end rule "React " when Integer() accumulate ( $n : Double( ) and Double( ), $x : count( $n ) ) String( ) then System.out.println( "Rule fires" ); end {code} The rules work normally in the first session created from the KB. When any additional session is created and used, the SegmentMemories are restored from the SM Prototypes. Unfortunately, the AccumulateNode -> RuleTerminalNode segment is restored twice, once when the "aaa" triggers the appropriate Beta Node, and once when the subnetwork updates the RIA node. The latter overwrites the already existing segment, overriding the partial link bits. See SegmentUtilities line 421, where this tentative patch shows the problem: {code} if ( NodeTypeEnums.isLeftTupleSource(node) && wm.getNodeMemory((MemoryFactory) node).getSegmentMemory() == null ) {code}