Colbert Philippe commented on MCOMPILER-336:

No XML entry 'useIncrementalCompilation' in my POM, even when I view Effective 
POM using Eclipse!   Since it's not there, there is nothing to delete.   Can 
you advise on what to do to find a good workaround?

> Dependency that should be on modulepath sometime put on classpath
> -----------------------------------------------------------------
>                 Key: MCOMPILER-336
>                 URL: https://issues.apache.org/jira/browse/MCOMPILER-336
>             Project: Maven Compiler Plugin
>          Issue Type: Task
>    Affects Versions: 3.7.0
>            Reporter: Martin Desruisseaux
>            Assignee: Robert Scholte
>            Priority: Major
>         Attachments: module-vs-classpath.zip
> {{maven-compiler-plugin}} sometime puts modularized dependencies on the 
> {{javac}} {{-classpath}} option instead than {{-modulepath}}, which cause 
> compilation failure. A test case is attached. Step to reproduce:
> {noformat}
> cd module-vs-classpath
> cd a
> mvn install
> cd ../b
> mvn clean install
> mvn install
> {noformat}
> The last command fail with the following error message:
> {noformat}
> [ERROR] Failed to execute goal 
> org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile 
> (default-compile) on project b: Compilation failure
> [ERROR] module not found: test.a
> {noformat}
> Execution with the {{-X}} option shows that the {{test.a}} dependency is 
> correctly declared in {{-modulepath}} when executing {{mvn clean install}}, 
> but is wrongly declared in {{-classpath}} when executing {{mvn install}}.
> A workaround is to remove the 
> {{<useIncrementalCompilation>false</useIncrementalCompilation>}} option in 
> the {{pom.xml}} files, or to execute {{touch src/main/java/module-info.java}} 
> before {{mvn install}}. However the same error message occurs when attempting 
> to execute {{mvn site}}, for which case I have found no workaround yet (note: 
> the {{mvn site}} problem is not reproduced by the attached 
> {{module-vs-classpath.zip}} file).

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