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https://issues.apache.org/jira/browse/HADOOP-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066366#comment-16066366
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Steve Loughran commented on HADOOP-14586:
-----------------------------------------
[~aw] I know we don't support java 9 in hadoop itself, and will never do so in
hadoop 2.7, but using the core libs for client-side operation is something more
realistic as an initial deliverable.
> 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: Minor
> Labels: Java9
> Attachments: HADOOP-14586-branch-2.7-01.patch,
> HADOOP-14586-branch-2.7-02.patch
>
>
> You cannot use any pre-Hadoop 2.8 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 not needed, {{compareTo}} also works without it,
> although it is still an invalid way to compare a version.
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