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https://issues.apache.org/jira/browse/SUREFIRE-1909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17390254#comment-17390254
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Christian Kohlschütter commented on SUREFIRE-1909:
--------------------------------------------------

As far as I understand, Jigsaw mandates that there can only be _one_ 
module-info.java per package (which makes sense). Unsurprisingly, IDEs like 
Eclipse concur and refuse adding a secondary file there.

I understand the document you refer to suggests that tests are to be moved to 
their own test package; this may be non-desirable for a variety of reasons. 
And, as far as it seems, surefire is totally fine keeping the tests in the same 
package (that's because --{{add-exports}} is added), as is Junit 5 in Eclipse. 
Just the combination of Junit 5 with Surefire doesn't work.

Can you reproduce using the attached project?

 

> Support JUnit 5 reflection access by changing add-exports to add-opens
> ----------------------------------------------------------------------
>
>                 Key: SUREFIRE-1909
>                 URL: https://issues.apache.org/jira/browse/SUREFIRE-1909
>             Project: Maven Surefire
>          Issue Type: Bug
>          Components: JUnit 5.x support
>    Affects Versions: 3.0.0-M5
>            Reporter: Christian Kohlschütter
>            Priority: Major
>         Attachments: surefire-jpms-bug.tar.gz
>
>
> Testing JUnit 5 classes of a JPMS-enabled project with Surefire may fail if a 
> test class (or, for example, an abstract test base class) is not declared 
> "public". I'm seeing the following error:
>  
> {code:java}
> java.lang.reflect.InaccessibleObjectException: Unable to make public static 
> void some.package.SomeClass.setupClass() throws java.io.IOException 
> accessible: module some.module does not "opens some.package" to unnamed 
> module @754ba872{code}
> This could be fixed by adding the recommended "{{opens some.package}}" to the 
> project's module-info.java, however that is undesirable since it changes the 
> project's behavior beyond just unit testing. Adding a secondary "test-only" 
> module-info.java is also counterproductive since not all IDEs support this, 
> and these two files would have to be kept in sync, which is non-trivial.
> An easy fix would be to change the "{{--add-exports-}}" VM parameter that 
> surefire adds automatically to "{{-}}{{add-opens}}" in 
> {{maven-surefire-common/src/main/java/org/apache/maven/plugin/surefire/booterclient/ModularClasspathForkConfiguration.java}}
> This bug is particularly bad because PMD now specifically complains about 
> junit5 classes marked as public instead of package-private; see 
> [https://pmd.github.io/2021/05/29/PMD-6.35.0/]



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