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From "Akira Ajisaka (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, 26 Jun 2017 17:19:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063444#comment-16063444
] 

Akira Ajisaka commented on HADOOP-14586:
----------------------------------------

Probably Apache Hadoop won't support Java 9 in Hadoop 2.7.x, but I'm thinking it's worth fixing
this.

* Fixing this issue is easy and the fix is compatible
* Users want the fix
* Now branch-2.7 is the only branch that is stable and maintained, so I'm thinking we cannot
force the users to upgrade the dependency to 2.8.x or upper.

>  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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