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https://issues.apache.org/jira/browse/GROOVY-11781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029202#comment-18029202
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Eric Milles commented on GROOVY-11781:
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In order for your mock to resolve "NAME" from the inner class, it calls into
{{GroovyMockMetaClass#getProperty(Object,String)}} with
{{Class<org.spockframework.smoke.mock.GroovyMockAbstractGlobalClass.AbstractClassA>}}
and "NAME" as arguments. This method tries "getNAME" as a method and the
missingMethod call within fails because the instance is a Class not a
AbstractClassA.
> 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
> Priority: Major
>
> 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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