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https://issues.apache.org/jira/browse/MWAR-405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15965492#comment-15965492
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ASF GitHub Bot commented on MWAR-405:
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Github user eolivelli closed the pull request at:
https://github.com/apache/maven-plugins/pull/112
> Workaround XStream incompatibility with Java9
> ---------------------------------------------
>
> Key: MWAR-405
> URL: https://issues.apache.org/jira/browse/MWAR-405
> Project: Maven WAR Plugin
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Enrico Olivelli
> Priority: Blocker
>
> The problem is that XStreams tries to access "comparator" field of
> java.util.TreeMap and this is forbidden in Java9
> {code}
> Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make
> field private final java.util.Comparator java.util.TreeMap.comparator
> accessible: module java.base does not "opens java.util" to unnamed module
> Happens while initializing
> org.apache.maven.plugins.war.util.WebappStructureSerializer
> {code}
> A possibile workaround is to change the initialization of XStreams in a way
> that only useful converters are registers, thus bypassing the problem
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