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Date: Sat, 24 Jun 2017 12:59:00 +0000 (UTC)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: common-dev@hadoop.apache.org
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Subject: [jira] [Created] (HADOOP-14586)  org.apache.hadoop.util.Shell
 causes failure in <clinit> leading to almost all of Hadoop failing (next
 one StringUtils)
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archived-at: Sat, 24 Jun 2017 12:59:04 -0000

Uwe Schindler created HADOOP-14586:
--------------------------------------

             Summary:  org.apache.hadoop.util.Shell causes failure in <clinit> leading to almost all of Hadoop failing (next one StringUtils)
                 Key: HADOOP-14586
                 URL: https://issues.apache.org/jira/browse/HADOOP-14586
             Project: Hadoop Common
          Issue Type: Bug
          Components: common
         Environment: Java 9, build 175 (Java 9 relaese candidate as of June 25th, 2017)
            Reporter: Uwe Schindler
            Priority: Critical


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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