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From eolivelli <>
Subject [GitHub] maven-plugins pull request #112: MWAR-405 Workaround XStream incompatibility...
Date Thu, 13 Apr 2017 02:02:54 GMT
GitHub user eolivelli reopened a pull request:

    MWAR-405  Workaround XStream incompatibility with Java9

    This is a proof-of-concept implementation of a possible way to word-around the actual
incompatibility of xstreams default converters with java9.
    As the maven-war-plugin does not need all of the converters (like TreeMapConverter which
is the primary cause of the issue) we can just register only the needed ones and bypass the
java9 issue
        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
    this PR is just a proof-of-concept, there is an email thread on the dev list. If the idea
is accepted I will submit a JIRA and official PR (some code cleanup is needed at least)

You can merge this pull request into a Git repository by running:

    $ git pull maven-war-plugin-easy-fix

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #112
commit 9bd4409a309d461ffc77dda06b11d295797d3b27
Author: eolivelli <>
Date:   2017-04-11T08:07:36Z

    MWAR-405 Workaround XStream incompatibility with Java9
    Register only used Converters


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