[jboss-jira] [JBoss JIRA] (DROOLS-5560) ClassCastException on Fact Attribute Set After UpdateToVersion

[Mario Fusco (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-5560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco updated DROOLS-5560:
--------------------------------
    Sprint: 2020 Week 34-36 (from Aug 17)  (was: 2020 Week 31-33 (from Jul 27))


> 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
>            Priority: Major
>         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.



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