[rules-users] Two bugs(?) of drools 5.3

Hi all, I'm using drools 5.3.0.Final.And I think I found two possibly bugs: 1): drl compilation failed when encountering multiple continuous '!' (a.k.a 'not' operator)s.for example: rule "out" when Msg(!!!false) then end the code above won't compile, but 'Msg(!false)' compiles correctly. I remember there's no such problems when using drools 5.0, this caused some incompatibility issues in our system... 2): Weird exception thrown: java.lang.ClassCastException: org.drools.reteoo.InitialFactImpl cannot be cast to XXX..., for example: rule "test" when l1:Msg(str == 'test') and l2:Msg(!bool) or eval(!false) then end this code above throws exception at runtime: org.drools.RuntimeDroolsException: Unexpected exception executing action org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction@743fbbfc at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:977) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:315) at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:845) at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255) at com.sample.DroolsTest.main(DroolsTest.java:56) Caused by: org.drools.RuntimeDroolsException: com.sample.Rule_testEval0Invoker@3e1b05a2 : java.lang.ClassCastException: org.drools.reteoo.InitialFactImpl cannot be cast to com.sample.Msg at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:119) at org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:178) at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:197) at org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:146) at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:158) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:215) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244) at org.drools.reteoo.Rete.assertObject(Rete.java:107) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:284) at org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction.execute(ReteooWorkingMemory.java:404) at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:975) ... 6 more Caused by: java.lang.ClassCastException: org.drools.reteoo.InitialFactImpl cannot be cast to com.sample.Msg at com.sample.Rule_testEval0Invoker.evaluate(Unknown Source) at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114) ... 17 more Is there any workaround for those problems? especially the 2nd one... Any help would be appreciated, Thanks! -- Regards. Miles. Wen