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}