commit 35e5ae98ba98aaa35c5b7abb84cc6e6b34a0737c

Author: Devaraj Das <ddas@yahoo-inc.com>
Date:   Sun Nov 21 22:55:22 2010 -0800

    HADOOP-6912. Fixes a NPE in a UGI method. Contributed by Kan Zhang.
    
    +++ b/YAHOO-CHANGES.txt
    +
    +    HADOOP-6912. Fixes a NPE in a UGI method. (Kan Zhang via ddas)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/yahoo-merge@1079139 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/hadoop/security/UserGroupInformation.java

@@ -785,8 +785,8 @@ public class UserGroupInformation {
    * Did the login happen via keytab
    * @return true or false
    */
-  public synchronized static boolean isLoginKeytabBased() {
-    return loginUser.isKeytab;
+  public synchronized static boolean isLoginKeytabBased() throws IOException {
+    return getLoginUser().isKeytab;
   }
 
   /**