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https://issues.apache.org/jira/browse/BEAM-5919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668922#comment-16668922
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Luke Cwik commented on BEAM-5919:
---------------------------------
The error is because after shading we check that all class files are within
org/apache/beam and Java 9 is adding a module-info.class in META-INF/ which is
outside of org/apache/beam and hence fails.
Trivial fix is to update the build files to exclude META-INF as well.
> Build breaks when including Multi-release Jars
> ----------------------------------------------
>
> Key: BEAM-5919
> URL: https://issues.apache.org/jira/browse/BEAM-5919
> Project: Beam
> Issue Type: Bug
> Components: build-system
> Affects Versions: 2.8.0
> Reporter: Ismaël Mejía
> Assignee: Luke Cwik
> Priority: Minor
> Attachments: logjava9jarissue.txt
>
>
> As part of BEAM-5891 there is a reported problem in the build system with
> jars that contain multiple versions of the classes (this is a feature
> introduced in Java 9). This should not be a problem when the main classes are
> still Java 8 compatible as it is the case for byte buddy.
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