[jboss-jira] [JBoss JIRA] (JBRULES-3656) java.lang.ClassCastException: org.drools.reteoo.AlphaNode$AlphaMemory cannot be cast to org.drools.reteoo.BetaMemory

[Mariano De Maio (JIRA)]

Mariano De Maio created JBRULES-3656:
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             Summary: java.lang.ClassCastException: org.drools.reteoo.AlphaNode$AlphaMemory cannot be cast to org.drools.reteoo.BetaMemory
                 Key: JBRULES-3656
                 URL: https://issues.jboss.org/browse/JBRULES-3656
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core  (expert)
    Affects Versions: 5.5.0.Beta1, 5.4.1.Final
            Reporter: Mariano De Maio
            Assignee: Mark Proctor
         Attachments: P8.tar.gz

When trying to add a rule package to a knowledge base I previously removed a used knowledge session from, the following error occurrs:

java.lang.ClassCastException: org.drools.reteoo.AlphaNode$AlphaMemory cannot be cast to org.drools.reteoo.BetaMemory
        at org.drools.reteoo.NotNode.updateSink(NotNode.java:461)
        at org.drools.reteoo.RuleTerminalNode.attach(RuleTerminalNode.java:347)
        at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:174)
        at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:134)
        at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:113)
        at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:445)
        at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:952)
        at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:629)
        at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
        at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
...

This issue doesn't seem to happen on 5.4.0.Final but it does appear on 5.5.0.Beta1 and on branch 5.4.x

I attached a project (P8.tar.gz) that allows you to test this issue. Any help would be appreciated

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