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https://issues.apache.org/jira/browse/GROOVY-11365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17842458#comment-17842458
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Christopher Smith commented on GROOVY-11365:
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I'm currently using gmavenplus:1.13.1. Do I need to do anything to try
5-alpha other than set my groovy4.version (e.g., plugin repositories)?
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Christopher Smith
> IllegalAccessError when using protected method as reference
> -----------------------------------------------------------
>
> Key: GROOVY-11365
> URL: https://issues.apache.org/jira/browse/GROOVY-11365
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 4.0.18, 4.0.21
> Reporter: Christopher Smith
> Priority: Critical
>
> I will try to repro this, but posting in case the description is sufficient
> to identify the problem:
> I have an abstract base class {{AbstractServiceImpl<E extends Entity>}} that
> defines {{protected final E upsert(E entity)}}. From a subclass inside a
> closure, I try to use {{this::upsert}} as a {{Consumer<DocumentRequest>}}.
> Starting somewhere between 4.0.14 and 4.0.18 (other bugs prevent me from
> bisecting further), an {{IllegalAccessError}} gets introduced at runtime:
> {code}
> java.lang.IllegalAccessError: class
> com.example.doc.DocumentRequestServiceImpl$_openUpload_closure2 tried to
> access protected method 'com.example.base.Entity
> com.example.base.AbstractServiceImpl.upsert(com.example.base.Entity)'
> (com.example.doc.DocumentRequestServiceImpl$_openUpload_closure2 and
> com.example.base.AbstractServiceImpl are in unnamed module of loader 'app')
> {code}
> I've examined the bytecode for both the call site and the method
> implementation, and I can't see a difference in the code generated between
> 4.0.14 and 4.0.18/21. I'm not certain why it works in 4.0.14, but with javac
> I would expect to see a lambda bridge to allow the lambda to access the
> containing-class-visible-but-only-by-inheritance protected method.
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