[jira] [Commented] (MCOMPILER-336) Dependency that should be on modulepath sometime put on classpath

["Colbert Philippe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MCOMPILER-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436114#comment-16436114 ] 

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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