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https://issues.apache.org/jira/browse/GROOVY-11668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17952400#comment-17952400
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Paul King commented on GROOVY-11668:
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I haven't thought it through yet but setting JP level to the JDK version
running the groovydoc process (usually the build) might be a small improvement
if adding the option proves tricky.
> Groovydoc crashes with higher Java language levels
> --------------------------------------------------
>
> Key: GROOVY-11668
> URL: https://issues.apache.org/jira/browse/GROOVY-11668
> Project: Groovy
> Issue Type: Improvement
> Components: GroovyDoc
> Reporter: James Daugherty
> Priority: Critical
>
> Groovydoc supports both groovy & java files. It supports parsing via the
> JavaParser library & the library supports specifying a language level.
> However, groovydoc does not have a way of setting it for the library at this
> time. By default the library defaults to the "popular" language level of
> that release - for the current JavaParser version that is Java 11.
> As projects update to newer language features, it is desirable to continue
> using groovydoc for later Java versions. This change is to add an option to
> groovydoc to specify the language level based on the possible values in the
> enum ParserConfiguration.LanguageLevel from the JavaParser library.
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