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https://issues.apache.org/jira/browse/SOLR-10966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066646#comment-16066646
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Uwe Schindler commented on SOLR-10966:
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I tested this already on Jenkins, all passes on Java 9: Here is the running
test: https://jenkins.thetaphi.de/job/Lucene-Solr-Hadoop-Update/19
> Add workaround for Hadoop-Common 2.7.2 incompatibility with Java 9
> ------------------------------------------------------------------
>
> Key: SOLR-10966
> URL: https://issues.apache.org/jira/browse/SOLR-10966
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Hadoop Integration, hdfs
> Affects Versions: 6.6
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Critical
> Fix For: master (7.0), 6.7, 6.6.1
>
> Attachments: SOLR-10966.patch
>
>
> I did some testing to work around HADOOP-14586 and found a temporary
> solution. All tests pass with Java 9 build 175 (HDFS, Hadoop Auth / Kerberos).
> This is a temporary workaround until we can upgrade Hadoop, see SOLR-10951
> The trick here is a hack: The Hadoop Shell class tries to parse
> {{java.version}} system property, which is simply {{"9"}} on the Java 9 GA /
> release candidate. It contains no dots and is shorter than 3 characters.
> Hadoop tries to get the {{substring(0,3)}} and fails with an
> IndexOutOfBoundsException in clinit. To work around this, we do the following
> on early Solr startup / test startup (in a static analyzer, like we do for
> logging initialization):
> - set {{java.version}} system property to {{"1.9"}}
> - initialize the Shell class in Hadoop
> - restore the old value of {{java.version}}
> The whole thing is done in a doPrivileged. I ran some tests on Policeman
> Jenkins, everything works. The hack is only done, if _we_ detect Java 9.
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