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https://issues.apache.org/jira/browse/GROOVY-11781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032328#comment-18032328
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Björn Kautler commented on GROOVY-11781:
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While writing excessive test cases first, I realized that also with 2.5-4.0 the
current logic is flawed, it just got way worse in 5.0.
Besides that, you might also consider backporting the changes you've made here.
Also with earlier Groovy versions I can reproduce
{{java.lang.IllegalArgumentException: object is not an instance of declaring
class}} with getting and setting properties when the global spy is used.
> static field access to outer class does not work properly anymore
> -----------------------------------------------------------------
>
> Key: GROOVY-11781
> URL: https://issues.apache.org/jira/browse/GROOVY-11781
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 5.0.1
> Reporter: Björn Kautler
> Assignee: Eric Milles
> Priority: Major
> Fix For: 5.0.2
>
>
> This is a regression in Groovy 5.
> Groovy 2.5, 3.0, and 4.0 it works fine.
> To reproduce:
> * checkout my {{groovy5}} PR branch of
> [https://github.com/spockframework/spock/pull/2213]
> * go to
> {{org.spockframework.smoke.mock.GroovyMockAbstractGlobalClass.AbstractClassA}}
> * replace the three {{GroovyMockAbstractGlobalClass.NAME}} by just {{NAME}}
> * execute {{./gradlew -Dvariant=5.0 -DjavaVersion=11 :spock-specs:test
> --tests org.spockframework.smoke.mock.GroovyMockAbstractGlobalClass --info}}
> As a result you get an `IllegalArgumentException` with message `object is not
> an instance of declaring class`.
> I'm not 100% sure whether this is a Groovy bug or Spock bug, but it works
> fine up to and including Groovy 4.
> If this is not a Groovy bug but a Spock bug, I'd appreciate very much help in
> how to resolve this on the Spock side.
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