[HADOOP-7999] "hadoop archive" fails with ClassNotFoundException

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.1
• Fix Version/s: 0.23.1
• Component/s: scripts
• Target Version/s: 0.23.1, 0.24.0
• Hadoop Flags: Reviewed
• Assignee: Jason Darrell Lowe
• Reporter: Jason Darrell Lowe
• Created: 27/Jan/12 17:48
• Updated: 05/Mar/12 02:48
• Resolved: 30/Jan/12 18:35

Description

Running "hadoop archive" from a command prompt results in this error:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/tools/HadoopArchives
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.tools.HadoopArchives
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.tools.HadoopArchives. Program will exit.

The hadoop front-end script expects the TOOL_PATH environment variable to be set, but nothing provides a default value for it if it is not set. Since $TOOL_PATH expands to nothing, the hadoop-archives jar under share/hadoop/tools/lib isn't found, and we end up with a ClassNotFound exception.