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https://issues.apache.org/jira/browse/HADOOP-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064131#comment-16064131
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Konstantin Shvachko edited comment on HADOOP-14586 at 6/27/17 4:27 AM:
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Hi [~thetaphi], the best way would be to submit a patch that you think fixes
Solr issue on Java 9 and make sure that it doesn't break Hadoop on Java 7 and 8.
Or verify that attached patch works for you.
was (Author: shv):
Hi [~thetaphi], the best way would be to submit a patch that you think fixes
Solr issue on Java 9 and make sure that it doesn't break Hadoop on Java 7 and 8.
> org.apache.hadoop.util.Shell in 2.7 breaks <clinit> on Java 9 RC build;
> backport HADOOP-10775 to 2.7.x
> -------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-14586
> URL: https://issues.apache.org/jira/browse/HADOOP-14586
> Project: Hadoop Common
> Issue Type: Bug
> Components: common
> Affects Versions: 2.7.2
> Environment: Java 9, build 175 (Java 9 release candidate as of June
> 25th, 2017)
> Reporter: Uwe Schindler
> Assignee: Akira Ajisaka
> Priority: Blocker
> Labels: Java9, release-blocker
> Attachments: HADOOP-14586-branch-2.7-01.patch
>
>
> You cannot use any Hadoop component anymore with the latest release candidate
> build of Java 9, because it fails with an StringIndexOutOfBoundsException in
> {{org.apache.hadoop.util.Shell#<clinit>}}. This leads to a whole cascade of
> failing classes (next in chain is StringUtils).
> The reason is that the release candidate build of Java 9 no longer has "-ea"
> in the version string and the system property "java.version" is now simply
> "9". This causes the following line to fail fatally:
> {code:java}
> private static boolean IS_JAVA7_OR_ABOVE =
> System.getProperty("java.version").substring(0, 3).compareTo("1.7") >=
> 0;
> {code}
> Analysis:
> - This code looks wrong, as comparing a version this way is incorrect.
> - The {{substring(0, 3)}} is completely useless, {{compareTo}} also works
> without it, although it is still an invalid way to compare a version.
> Maybe look at Lucene's source code (Constants.java) to have a better way in
> doing this! Sorry this is incredible to me! Hardcoding string bounds into a
> static initializer that are applied on a string that you have no control of...
> This issue breaks Apache Solr from working with Java 9, so I set it to
> "critical". We have to disable the whole Hadoop integration once Java 9 is
> detected.
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