[jboss-jira] [JBoss JIRA] (WFLY-13512) Duplicated classes in META-INF folder

[Richard Opalka (Jira)]

    [ https://issues.redhat.com/browse/WFLY-13512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114417#comment-14114417 ] 

Richard Opalka commented on WFLY-13512:
---------------------------------------

Hi [~antferna] this is new feature introduced in JDK9.
When Java Platform Module System was introduced,
together with it was introduced also so called
"multirelease jar file" that is a jar file that may contain
classes with different behaviour on different JDK versions.
Classes in META-INF/version subfolder are targeting
particular JDKs. It is not an error or packaging issue.
I suggest you to upgrade the enforcer maven plugin - 
newer versions should be familiar with this JDK feature.

> Duplicated classes in META-INF folder
> -------------------------------------
>
>                 Key: WFLY-13512
>                 URL: https://issues.redhat.com/browse/WFLY-13512
>             Project: WildFly
>          Issue Type: Quality Risk
>            Reporter: Antonio Fernandez Alhambra
>            Priority: Major
>              Labels: reported-by-qe
>         Attachments: Screenshot from 2020-05-14 17-20-16.png
>
>
> There are duplicated classes inside the org.wildfly.common:wildfly-common file.
> So whenever the enforcer maven plugin is used for building, if there is a dependency in the pom.xml, enforcer plugin will fail complaining about this jar due to these duplicated jar files.
> {noformat}
> Duplicate classes found:
>   Found in:
>     org.kie.server:kie-server-router-proxy:jar:7.38.0-SNAPSHOT:compile
>     org.wildfly.common:wildfly-common:jar:1.5.1.Final:compile
>   Duplicate classes:
>     META-INF/versions/9/org/wildfly/common/lock/JDKSpecific.class
>     META-INF/versions/9/org/wildfly/common/os/ProcessRedirect.class
>     META-INF/versions/9/org/wildfly/common/lock/Substitutions$Target_PauseNode.class
>     META-INF/versions/9/org/wildfly/common/os/GetProcessInfoAction.class
>     META-INF/versions/9/org/wildfly/common/lock/JDKSpecific$1.class
>     META-INF/versions/9/org/wildfly/common/lock/Substitutions.class
>     META-INF/versions/9/org/wildfly/common/lock/Substitutions$Target_JDKSpecific.class
>     META-INF/versions/11/org/wildfly/common/archive/JDKSpecific.class
>     META-INF/versions/9/org/wildfly/common/cpu/ProcessorInfo.class
> {noformat}
> Seems these duplicated classes are bundled in the jar since version 1.4.x onwards.
> These duplicated classes are located in the META-INF/versions folders inside the jar.
> Attached a screenshot of the same.



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