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javax.security.auth.login.LoginException: java.lang.NullPointerException: invalid null input: name	at com.sun.security.auth.UnixPrincipal.(Unknown Source)	at com.sun.security.auth.module.UnixLoginModule.login(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at javax.security.auth.login.LoginContext.invoke(Unknown Source)	at javax.security.auth.login.LoginContext.access$000(Unknown Source)	at javax.security.auth.login.LoginContext$5.run(Unknown Source)	at javax.security.auth.login.LoginContext$5.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.login.LoginContext.invokeCreatorPriv(Unknown Source)	at javax.security.auth.login.LoginContext.login(Unknown Source)	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:471)	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:452)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setConfigurationParameters(FSNamesystem.java:475)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.(FSNamesystem.java:464)	at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1162)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1271)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1288)	at javax.security.auth.login.LoginContext.invoke(Unknown Source)	at javax.security.auth.login.LoginContext.access$000(Unknown Source)	at javax.security.auth.login.LoginContext$5.run(Unknown Source)	at javax.security.auth.login.LoginContext$5.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.login.LoginContext.invokeCreatorPriv(Unknown Source)	at javax.security.auth.login.LoginContext.login(Unknown Source)	at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:471)	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:452)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setConfigurationParameters(FSNamesystem.java:475)	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.(FSNamesystem.java:464)	at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1162)	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1271)	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1288)