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https://issues.apache.org/jira/browse/MCOMPILER-321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16503872#comment-16503872
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Hudson commented on MCOMPILER-321:
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Build succeeded in Jenkins: Maven TLP » maven-compiler-plugin » MCOMPILER-321 #4
See
https://builds.apache.org/job/maven-box/job/maven-compiler-plugin/job/MCOMPILER-321/4/
> Problematic Java 9 modules are silently ignored
> -----------------------------------------------
>
> Key: MCOMPILER-321
> URL: https://issues.apache.org/jira/browse/MCOMPILER-321
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Reporter: Marcel Kolsteren
> Priority: Major
> Fix For: 3.7.1
>
> Attachments: maven-compiler-plugin-bug.zip
>
>
> Before the compilation starts, the compiler plugin prepares the module path
> and the class path. Unfortunately, this process is very lenient. If the
> plugin cannot find a module that is specified in the module-info file, it
> doesn't report this problem, and it just carries on. In the end, the compiler
> will give a "module not found", giving no clue about the root cause.
> As an example, I attached a simple maven project with a module info file that
> refers to an automatic module named {{jython-standalone}}. The dependencies
> contain a jar file {{jython-standalone-2.7.0.jar}}. That jar file contains no
> module information, and it would normally be resolvable as an automatic
> module. However, when building the project, the Java compiler fails with this
> error:
> {{module not found: jython.standalone}}
> The root cause of the error is that the jar file contains a class at top
> level, which is illegal for a module. So, the error message "module not
> found" is misleading.
> I think this is a bug, because the maven-compiler-plugin fails to perform its
> task of building a correct module path, but doesn't tell, and just carries
> on. Instead, it should stop, and give an informative error message.
> Relevant source code:
> * [https://github.com/apache/maven-compiler-plugin], class {{CompilerMojo}}
> * [https://github.com/codehaus-plexus/plexus-languages], class
> {{LocationManager}} and {{MainClassModuleNameExtractor}}
> *
> [https://docs.oracle.com/javase/9/docs/api/java/lang/module/ModuleFinder.html]
> The {{MainClassModuleNameExtractor}} uses the {{ModuleFinder}} class of the
> JDK to find modules. I think that these two error situations should lead to
> an error and a clear description of possible causes:
> * {{ModuleFinder#findAll}} returns an empty set.
> * {{ModuleFinder#findAll}} results in a {{FindException}}. When this happens
> is well documented in the {{ModuleFinder#of}} method. This exception is
> currently swallowed.
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