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https://issues.apache.org/jira/browse/MWAR-405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15967000#comment-15967000
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Enrico Olivelli commented on MWAR-405:
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I have updated the patch, listing only the used converters.
Notes:
- the IntConverter is needed in order to build real webapps (I have used my
projects), but no test case reproduces the error I have when I disable that
converter. Should I add a test case which covers the need for IntConverter ?
- The lack of any of the other Converters leads to failing test cases, even on
Java8
> 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
> Assignee: Robert Scholte
> 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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