[jira] [Created] (MJAVADOC-622) javadoc:javadoc fails for a JPMS module

["Lukas Jungmann (Jira)" <ji...@apache.org>]

Lukas Jungmann created MJAVADOC-622:
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             Summary: javadoc:javadoc fails for a JPMS module
                 Key: MJAVADOC-622
                 URL: https://issues.apache.org/jira/browse/MJAVADOC-622
             Project: Maven Javadoc Plugin
          Issue Type: Bug
          Components: javadoc
    Affects Versions: 3.1.1
            Reporter: Lukas Jungmann
         Attachments: jdocbug.zip, options

sample project is attached, so to reproduce, either unzip it and run `mvn javadoc:javadoc` or follow following steps: 

- have a simple jar project with a simple class/interface and module-info.java
- define compiler(3.8.1) and javadoc(3.1.1) plugins
- set 'release=11' for both
- on the command line with JDK 11.0.4 run `mvn javadoc:javadoc`

=> fails with:


{code}
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.1.1:javadoc (default-cli) on project jdocbug: An error has occurred in Javadoc report generation:
[ERROR] Exit code: 1 - error: module not found: org.jdocbug
[ERROR]
[ERROR] Command line was: /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk/Contents/Home/bin/javadoc @options @packages @argfile
[ERROR]
[ERROR] Refer to the generated Javadoc files in '/Users/lukas/NetBeansProjects/jdocbug/target/site/apidocs' dir.
[ERROR]
{code}

Expected behaviour is that javadoc for current project is generated in `target/site/apidocs` folder.

looking into options file generated by the plugin:
- `--patch-module` option looks strange there
- `--source-path` is missing



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