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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14586) org.apache.hadoop.util.Shell in 2.7 breaks <clinit> on Java 9 RC build; backport HADOOP-10775 to 2.7.x
Date Mon, 03 Jul 2017 01:06:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071833#comment-16071833

Konstantin Shvachko commented on HADOOP-14586:

You are right it's lexicographic order.
I tried to compile 2.7 branch with Java 1.6 and it failed via maven enforcer plugin.
[INFO] --- maven-enforcer-plugin:1.3.1:enforce (clean) @ hadoop-main ---
[WARNING] Rule 1: org.apache.maven.plugins.enforcer.RequireJavaVersion failed with message:
Detected JDK Version: 1.6.0-65 is not in the allowed range [1.7,).
So I think it is safe to return true here. Could you please add a JavaDoc comment for {{IS_JAVA7_OR_ABOVE}}
that Java 1.7 or higher is enforced in pom.xml.

>  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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