[jboss-jira] [JBoss JIRA] (DROOLS-5449) ClassCastException upon unreferenced declare update

[Mario Fusco (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-5449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-5449.
---------------------------------
    Resolution: Explained


After a KieBase has been updated you shouldn't keep using the FactType obtained from that KieBase before the update. Getting again the FactType from the KieBase after the update, e.g. in your test case adding
{code:java}
 factType = kieBase.getFactType("org.example", "ReferencedType");{code}
after the update, fixes the test.

> ClassCastException upon unreferenced declare update
> ---------------------------------------------------
>
>                 Key: DROOLS-5449
>                 URL: https://issues.redhat.com/browse/DROOLS-5449
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 7.38.0.Final
>            Reporter: Matteo Casalino
>            Assignee: Mario Fusco
>            Priority: Major
>         Attachments: class-cast-exception-on-unreferenced-declare-update.zip
>
>
> After updating a declared type that is not referenced in the rules with _updateToVersion()_,
>  running _fireAllRules()_ many times in a loop throws _ClassCastException_.
> E.g., when the following DRL:
> {noformat}
> declare UnreferencedType
>  x : int
> end 
> declare ReferencedType
>  str : String
> end
>  
> rule "example rule"
> when
>  ReferencedType( str == "A" )
> then
> end{noformat}
> is updated to:
> {noformat}
> declare UnreferencedType
>  x : int
>  newField : String
> end 
> declare ReferencedType
>  str : String
> end
>  
> rule "example rule"
> when
>  ReferencedType( str == "A" )
> then
> end{noformat}
> the following exception it thrown by _fireAllRules()_:
> {noformat}
> java.lang.RuntimeException: Error evaluating constraint 'str == "A"' in [Rule "example rule" in org/example/rules.drl]
>  at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:277)
>  at org.drools.core.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:225)
>  at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:139)
>  ...
>  Caused by: java.lang.ClassCastException: class org.example.ReferencedType cannot be cast to class org.example.ReferencedType (org.example.ReferencedType is in unnamed module of loader org.drools.dynamic.DynamicProjectClassLoader$DefaultInternalTypesClassLoader @46292372; org.example.ReferencedType is in unnamed module of loader org.drools.dynamic.DynamicProjectClassLoader$DefaultInternalTypesClassLoader @23b8d9f3)
>  at ConditionEvaluator7ed8b2c57cad4e74b856fdba30554aa1.evaluate(Unknown Source)
>  at org.drools.core.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:275)
>  ... 43 more{noformat}



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