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https://issues.apache.org/jira/browse/MJAVADOC-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17693825#comment-17693825
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Stefano Chizzolini commented on MJAVADOC-745:
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For the purpose, I prepared a fix proposal (see
[fix-taglet-autodetect|https://github.com/stechio/maven-javadoc-plugin/tree/fix-taglet-autodetect]
branch — because of a regression affecting dependency resolution on current
master HEAD (see MJAVADOC-742), I had to temporarily create my branch from the
last functioning version (3.4.1); when that regression is solved, I will move
my changes to a proper PR branch from master).
My proposal overcomes the severe limitation on topic, adding a dependency to a
robust classpath scanner
([classgraph|https://github.com/classgraph/classgraph]) — I'm not aware if
Apache already has its own preferred classpath scanner, neither am I aware
which Apache policies apply to the addition of new dependencies (I'm looking
forward to your feedback, thanks).
My branch includes a new unit test ({{{}tagletArtifacts-jdk9-test{}}}) and has
been successfully verified before commit ({{{}mvn -P run-its verify{}}}).
> Taglet auto-detection doesn't support transitive dependencies
> -------------------------------------------------------------
>
> Key: MJAVADOC-745
> URL: https://issues.apache.org/jira/browse/MJAVADOC-745
> Project: Maven Javadoc Plugin
> Issue Type: Bug
> Components: javadoc
> Affects Versions: 3.4.1
> Reporter: Stefano Chizzolini
> Priority: Major
>
> The current implementation of the taglet auto-detection algorithm (initial
> feature request: MJAVADOC-204) doesn't honor the transitive dependency
> resolution of the configured taglet artifacts (see
> [<tagletArtifacts/>|https://maven.apache.org/plugins/maven-javadoc-plugin/javadoc-mojo.html#tagletArtifacts]):
> _each artifact on the taglet classpath is scanned separately_ (see
> [AbstractJavadocMojo.addTagletsFromTagletArtifacts(..)|https://github.com/apache/maven-javadoc-plugin/blob/a5db96e7e16cc432d8fdea05f460f6c3fa258ba9/src/main/java/org/apache/maven/plugins/javadoc/AbstractJavadocMojo.java#L5901]
> and
> [JavadocUtil.getTagletClassNames(..)|https://github.com/apache/maven-javadoc-plugin/blob/a5db96e7e16cc432d8fdea05f460f6c3fa258ba9/src/main/java/org/apache/maven/plugins/javadoc/JavadocUtil.java#L721]),
> _causing taglet class loading to fail in case its hierarchy is spread across
> multiple artifacts_ (its class loader has visibility only on a single
> artifact at a time, in the wrong assumption that no intermediate artifact
> lies between the Taglet interface and its implementations).
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