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https://issues.apache.org/jira/browse/GROOVY-11118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17951642#comment-17951642
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Paul King commented on GROOVY-11118:
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A minor breaking change occurs for scripts with a static main method and no
other statements outside methods. If affected, use the "run" method instead.
> Initial JEP 521/445 compatibility
> ---------------------------------
>
> Key: GROOVY-11118
> URL: https://issues.apache.org/jira/browse/GROOVY-11118
> Project: Groovy
> Issue Type: Sub-task
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Labels: breaking
> Fix For: 5.0.0-alpha-1
>
>
> [JEP 445: Unnamed Classes and Instance Main
> Methods|https://openjdk.org/jeps/445] provides features that improve using
> Java for scripting purposes. Groovy 5 offers compatibility to JEP 445 with
> some minor differences. GROOVY-11166 outlines the specification for this
> feature.
> This issue covers initial support of this feature delivered as part of
> 5.0.0-alpha-1 including:
> * Support for the various "main" method forms offered by JEP 445
> * Support for an additional "run" method form offered by Groovy to combine
> some of the features offered by JEP 445 while still creating a traditional
> Groovy "script" class which extends from the {{Script}} class.
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