Multiple ClassCastException-s when executing rules -------------------------------------------------- Key: DROOLS-486 URL: https://issues.jboss.org/browse/DROOLS-486 Project: Drools Issue Type: Bug Affects Versions: 6.0.1.Final Environment: JDK6, single-threaded execution Reporter: Sergey Alaev Assignee: Mario Fusco Fix For: 6.2.0.Beta2 When trying to migrate to Drools 6.0.1 (everything was fine with 6.0.0) we get multiple ClassCastException. Assume we have hierarchy where B and C are children of A and we have following rules: when: B(....) then: ... when: C(...) then: ... Then following exceptions are observed on every execute with instance of B() in context: java.lang.ClassCastException: B cannot be cast to C at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:217) at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:174) at org.drools.core.phreak.PhreakFromNode.checkConstraintsAndPropagate(PhreakFromNode.java:298) at org.drools.core.phreak.PhreakFromNode.doLeftInserts(PhreakFromNode.java:101) at org.drools.core.phreak.PhreakFromNode.doNode(PhreakFromNode.java:49) at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:348) at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161) at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116) at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:200) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:67) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1200) at org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:957) at org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:941) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:264) Again, everything works OK in Drools 6.0.0.