Hadoop 0.21 will not work on non-SUN JREs due to use of com.sun.security in org/apache/hadoop/security/UserGroupInformation.java
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                 Key: HADOOP-6941
                 URL: https://issues.apache.org/jira/browse/HADOOP-6941
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.21.0
         Environment: SLES 11, Apache Harmony 6 and SLES 11, IBM Java 6
            Reporter: Stephen Watt
             Fix For: 0.21.1, 0.22.0, 0.21.0


Attempting to format the namenode or attempting to start Hadoop using Apache Harmony or the IBM Java JREs results in the following exception:

10/09/07 16:35:05 ERROR namenode.NameNode: java.lang.NoClassDefFoundError: com.sun.security.auth.UnixPrincipal
	at org.apache.hadoop.security.UserGroupInformation.<clinit>(UserGroupInformation.java:223)
	at java.lang.J9VMInternals.initializeImpl(Native Method)
	at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setConfigurationParameters(FSNamesystem.java:420)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:391)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1240)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1348)
	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1368)
Caused by: java.lang.ClassNotFoundException: com.sun.security.auth.UnixPrincipal
	at java.net.URLClassLoader.findClass(URLClassLoader.java:421)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:652)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:346)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:618)
	... 8 more

This is a negative regression as previous versions of Hadoop worked with these JREs

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