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https://issues.apache.org/jira/browse/HADOOP-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072248#comment-16072248
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Steve Loughran commented on HADOOP-14586:
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Konstantin: Uwe is right, the probe isn't needed. 2.7 is Java 7+. 2.8 contains
the patch which removes the probe as part of a big cleanup of Shell itself.
Cherry picking the smallest bits of that patch needed to fix the condition and
remove some codepaths which can be guaranteed never to be executed would make
this problem go away
> 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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