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https://issues.apache.org/jira/browse/SUREFIRE-1563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596711#comment-16596711
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Christian Stein commented on SUREFIRE-1563:
-------------------------------------------

Will give the Surefire configuration a shot, soon.

Regarding _"a module that is declared in the module-path"_: it is not declared, 
it is added as an element on the path for potential resolution – but if no 
other modules requires it, it is not resolved. This is one main difference to 
the class-path. And a good one, imho.

Here are some more details on the topic: 
https://blog.codefx.org/java/module-system-optional-dependencies/

> NoClassDefFoundError for JPMS modules with "require static"
> -----------------------------------------------------------
>
>                 Key: SUREFIRE-1563
>                 URL: https://issues.apache.org/jira/browse/SUREFIRE-1563
>             Project: Maven Surefire
>          Issue Type: Bug
>          Components: Maven Surefire Plugin
>    Affects Versions: 2.22.0
>            Reporter: Simone Bordet
>            Priority: Major
>         Attachments: maven-jpms.tgz
>
>
> When a Maven module has a {{module-info.java}} that contains a {{requires 
> static}}, Surefire throws {{NoClassDefFoundError}} when running the tests for 
> that Maven module.
> If the dependency is declared only as {{required}} (no {{static}}), then the 
> tests run fine.
> Attached a reproducible project.



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