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Posted to common-issues@hadoop.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2017/08/20 22:26:00 UTC
[jira] [Commented] (HADOOP-14586) StringIndexOutOfBoundsException
breaks org.apache.hadoop.util.Shell on 2.7.x with Java 9
[ https://issues.apache.org/jira/browse/HADOOP-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16134581#comment-16134581 ]
Uwe Schindler commented on HADOOP-14586:
----------------------------------------
FYI, I updated Solr to use Hadoop 2.7.4. Thanks!
> StringIndexOutOfBoundsException breaks org.apache.hadoop.util.Shell on 2.7.x with Java 9
> ----------------------------------------------------------------------------------------
>
> 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
> Fix For: 2.7.4
>
> Attachments: HADOOP-14586-branch-2.7-01.patch, HADOOP-14586-branch-2.7-02.patch, HADOOP-14586-branch-2.7-03.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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