Setting the planning variable nullable in nurserostering examples causes Drools NPE ----------------------------------------------------------------------------------- Key: DROOLS-1186 URL: https://issues.jboss.org/browse/DROOLS-1186 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.2.0.Final, 6.3.0.Final Environment: Windows 7 x 64, JDK 8u66, IDE netbeans 8.0.1. Reporter: Julio Bellon Aguilera Assignee: Mario Fusco Priority: Critical Fix For: 7.0.0.Beta1 Attachments: PLANNER_488.patch If you set the planning variable to "nullable=true", firstable, causes a IllegalStateException. fixed that, causes the first NPE, and fixed that, causes other NPE unfixed: Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Caused by: java.lang.NullPointerException at org.drools.core.phreak.RuleNetworkEvaluator.deleteChildLeftTuple(RuleNetworkEvaluator.java:778)