[HDFS-14078] Admin helper fails to prettify NullPointerExceptions

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.0, 3.2.1, 3.1.3
• Target Version/s: 3.3.0
• Assignee: Marton Elek
• Reporter: Marton Elek
• Created: 14/Nov/18 10:42
• Updated: 18/Jun/19 19:01
• Resolved: 18/Jun/19 19:01

Description

org.apache.hadoop.hdfs.tools.AdminHelper has a method to prettifyExceptions:

  static String prettifyException(Exception e) {
    return e.getClass().getSimpleName() + ": "
        + e.getLocalizedMessage().split("\n")[0];
  }

But if e is a NPE the e.getLocalizedMessage() could be null. In that case NPE will be thrown and the original error message will be lost.