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https://issues.apache.org/jira/browse/MJAVADOC-618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892022#comment-16892022
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Robert Scholte commented on MJAVADOC-618:
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So this one is actually a tricky usecase. As mentioned in the error, the module
path only allows jars and outputDirectories, not wars or zips.
And there's another issue: there's no specifications for webarchives regarding
module descriptors or module names, it has only been specified for jars.
[~simonebordet] are you aware of any issue or JEP to solve this for webarchives?
Based on that it will be quite a challenge to solve this. It might work if we
manage to get the output directory in case of non-jar files. So it'll only work
if they are part of the Maven multimodule.
> Goal javadoc:aggregate fails with submodules packaged as war
> ------------------------------------------------------------
>
> Key: MJAVADOC-618
> URL: https://issues.apache.org/jira/browse/MJAVADOC-618
> Project: Maven Javadoc Plugin
> Issue Type: Bug
> Components: javadoc
> Affects Versions: 3.1.0, 3.1.1
> Environment: - Java 11 or grater is required.
> - Submodules must be configured to be java modules. I've used
> 'Automatic-Module-Name' parameters with maven-jar-plugin
> Reporter: Andrea Del Bene
> Priority: Major
> Attachments: maven-modular.zip
>
>
> If we have a submodule project producing a war archive, {{javadoc:aggregate}}
> fails with the following message:
> {noformat}
> [WARNING] Only outputDirectories and jars are accepted on the path
> [ERROR] Error while creating javadoc report: Only outputDirectories and jars
> are accepted on the path
> java.lang.IllegalArgumentException: Only outputDirectories and jars are
> accepted on the path
> at org.codehaus.plexus.languages.java.jpms.LocationManager.resolvePath
> (LocationManager.java:333)
> at org.codehaus.plexus.languages.java.jpms.LocationManager.resolvePath
> (LocationManager.java:139)
> at
> org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addJavadocOptions
> (AbstractJavadocMojo.java:5001)
> {noformat}
> After some investigations it seems it tries to pass the war package to
> LocationManager.resolvePath.
> I've added a quickstart project to reproduce the problem. Just run:
> {{mvn package javadoc:aggregate}}
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