NPE when building KieBase with OOPath in a declared window ---------------------------------------------------------- Key: DROOLS-1451 URL: https://issues.jboss.org/browse/DROOLS-1451 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.0.0.Beta6 Environment: Reproducible with 7.0.0-SNAPSHOT. Reporter: Marek Winkler Assignee: Mario Fusco Attachments: oopath-cep-stacktrace.txt When using an OOPath expression in a declared window (does not matter if a length or a time window), a NPE is thrown. For instance, a rule such as: {code} declare window Pings MessageEvent( /msg{ message == 'Ping' } ) over window:length( 2 ) end rule R when $messageEvent: MessageEvent() from window Pings then events.add( $messageEvent ); end {code} produces the following exception (see the attachment for the full stacktrace) when building the KieBase: {code} java.lang.NullPointerException at org.drools.core.reteoo.builder.WindowReferenceBuilder.build(WindowReferenceBuilder.java:40) at org.drools.core.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.java:116) at org.drools.core.reteoo.builder.PatternBuilder.build(PatternBuilder.java:77) at org.drools.core.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:108) at org.drools.core.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:68) at org.drools.core.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:164) at org.drools.core.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:136) at org.drools.core.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:110) ... at org.drools.compiler.kie.builder.impl.KieContainerImpl.createKieBase(KieContainerImpl.java:630) ... {code}