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https://issues.apache.org/jira/browse/HADOOP-17317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17217516#comment-17217516
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Akira Ajisaka commented on HADOOP-17317:
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I think upgrading dnsjava to 3.0.0+ fixes this issue.
Reference: https://github.com/dnsjava/dnsjava/issues/9
> [JDK 11] Upgrade dnsjava to remove illegal access warnings
> ----------------------------------------------------------
>
> Key: HADOOP-17317
> URL: https://issues.apache.org/jira/browse/HADOOP-17317
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Akira Ajisaka
> Priority: Major
>
> Originally reported by [~kihwal] in
> https://issues.apache.org/jira/browse/HADOOP-15338?focusedCommentId=17129854&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17129854
> When running FsShell commands, there are some warning messages as follows:
> {noformat}
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by org.xbill.DNS.ResolverConfig to method
> sun.net.dns.ResolverConfiguration.open()
> WARNING: Please consider reporting this to the maintainers of
> org.xbill.DNS.ResolverConfig
> WARNING: Use --illegal-access=warn to enable warnings of further illegal
> reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> {noformat}
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