Matteo Casalino created DROOLS-5560: --------------------------------------- Summary: ClassCastException on Fact Attribute Set After UpdateToVersion Key: DROOLS-5560 URL: https://issues.redhat.com/browse/DROOLS-5560 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.41.0.Final Reporter: Matteo Casalino Assignee: Mario Fusco Attachments: class-cast-exception-on-fact-attribute-set-after-update.zip After updating a KieContainer with a change in a fact type _UnreferencedType_, if instances of another unrelated fact type _ReferencedType_ are modified in a rule, then setting any field of _ReferencedType_ through the _FactType_ API will throw a _ClassCastException_: {noformat} java.lang.ClassCastException: class org.example.facts.ReferencedType cannot be cast to class org.example.facts.ReferencedType (org.example.facts.ReferencedType is in unnamed module of loader org.drools.dynamic.DynamicProjectClassLoader$DefaultInternalTypesClassLoader @59901c4d; org.example.facts.ReferencedType is in unnamed module of loader org.drools.dynamic.DynamicProjectClassLoader$DefaultInternalTypesClassLoader @5e1fc2aa) at org.drools.base.org.example.facts.ReferencedType1921143808$setStr.setValue(Unknown Source) at org.drools.core.base.ClassFieldWriter.setValue(ClassFieldWriter.java:164) at org.drools.core.base.ClassFieldAccessor.setValue(ClassFieldAccessor.java:246) at org.drools.core.factmodel.ClassDefinition.set(ClassDefinition.java:278) at org.example.reproducer.FactTypeUpdateTest.testUpdateThenSetFactAttribute(FactTypeUpdateTest.java:132) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58){noformat} Below the example DRL that triggers the issue. Initial DRL: {noformat} package org.example.facts declare ReferencedType str : String end declare UnreferencedType x : int end package org.example.rules import org.example.facts.*; rule "rule updating ReferencedType" "when $x : ReferencedType( ) then $x.setStr("foo"); update($x); end{noformat} Updated DRL: {noformat} package org.example.facts declare ReferencedType str : String end declare UnreferencedType x : int y : String // NEW ATTRIBUTE ADDED HERE end package org.example.rules import org.example.facts.*; rule "rule updating ReferencedType" "when $x : ReferencedType( ) then $x.setStr("foo"); update($x); end{noformat} Throwing code example: {noformat} updateToVersion(); // Updates the KieContainer KieBase kiebase = kieContainer.getKieBase("ExampleKiebase"); FactType referencedType = kiebase.getFactType("org.example.facts", "ReferencedType"); Object instance = referencedType.newInstance(); referencedType.set(instance, "str", "bar"); // Throws ClassCastException{noformat}   This is similar to DROOLS-5449, but in this case we instantiate the fact from the updated fact type, so we believe that there is no API misuse. -- This message was sent by Atlassian Jira (v7.13.8#713008)