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https://issues.apache.org/jira/browse/VFS-859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17941851#comment-17941851
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Piotr Karwasz commented on VFS-859:
-----------------------------------
This issue is cause by multiple factors:
* {{httpcore}} is *directly* used in the code, so it should be declared as
*direct* optional dependency. Due to this fact, Moditect adds a {{requires}}
directive for the module.
* Due to a bug in either Moditect or Maven, the now *transitive* {{httpcore}}
dependency does not inherit the "optional" flag from {{httpclient}} and the
{{static}} modifier is not added to the JPMS descriptor (see
[moditect/moditect#259|https://github.com/moditect/moditect/issues/259]).
> Improper handling of optional JPMS modules
> ------------------------------------------
>
> Key: VFS-859
> URL: https://issues.apache.org/jira/browse/VFS-859
> Project: Commons VFS
> Issue Type: Improvement
> Affects Versions: 2.10.0
> Reporter: Piotr Karwasz
> Priority: Major
>
> The current automatically generated JPMS module descriptor contains a:
> {code:java}
> requires org.apache.httpcomponents.httpcore;
> {code}
> directive, without the {{static}} modifier, which causes runtime exceptions
> if the *optional* {{httpcore}} dependency is not present at runtime:
> {noformat}
> Error occurred during initialization of boot layer
> java.lang.module.FindException: Module org.apache.httpcomponents.httpcore not
> found, required by org.apache.commons.vfs2
> {noformat}
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