The Exception in the thread "main" Java. Lang. RuntimeException: Java. Lang. RuntimeException: Java. Lang. ClassNotFoundException: org.. Apache hadoop. Security. JniBasedUnixGroupsMappingWithFallback
At org, apache hadoop. Conf. Configuration. GetClass (881) Configuration. Java:
At org, apache hadoop. Security. Groups. (48) Groups. Java:
At org, apache hadoop. Security. Groups. GetUserToGroupsMappingService (140) Groups. Java:
At org, apache hadoop. Security. UserGroupInformation. The initialize (UserGroupInformation. Java: 206)
At org, apache hadoop. Security. UserGroupInformation. The ensureInitialized (UserGroupInformation. Java: 185)
At org, apache hadoop. Security. UserGroupInformation. IsSecurityEnabled (UserGroupInformation. Java: 237)
At org, apache hadoop. Security. UserGroupInformation. GetLoginUser (UserGroupInformation. Java: 482)
At org, apache hadoop. Security. UserGroupInformation. GetCurrentUser (UserGroupInformation. Java: 468)
At org, apache hadoop. Fs. FileSystem Cache $Key. (1519) FileSystem. Java:
At org, apache hadoop. Fs. $Cache FileSystem. Get (1420) FileSystem. Java:
At org, apache hadoop. Fs. FileSystem. Get (254) FileSystem. Java:
The at org. Conan. Mymahout. HDFS. HdfsDAO. RMR (HdfsDAO. Java: 59)
The at org. Conan. Mymahout. Recommendation. ItemCFHadoop. Main (ItemCFHadoop. Java: 21)
under Caused by: Java. Lang. RuntimeException: Java. Lang. ClassNotFoundException: org.. Apache hadoop. Security. JniBasedUnixGroupsMappingWithFallback
At org, apache hadoop. Conf. Configuration. GetClass (849) Configuration. Java:
At org, apache hadoop. Conf. Configuration. GetClass (873) Configuration. Java:
. 12 more
Under Caused by: Java. Lang. ClassNotFoundException: org.. Apache hadoop. Security. JniBasedUnixGroupsMappingWithFallback
The at java.net.URLClassLoader$1.run URLClassLoader. Java: (200)
The at Java. Security. The AccessController. DoPrivileged (Native Method)
The at java.net.URLClassLoader.findClass URLClassLoader. Java: (188)
The at Java. Lang. This. LoadClass (307). This Java:
At sun. Misc. The Launcher $AppClassLoader. LoadClass (301). The Launcher Java:
The at Java. Lang. This. LoadClass (252). This Java:
The at Java. Lang. This. LoadClassInternal (320). This Java:
The at Java. Lang. Class. ForName0 (Native Method)
The at Java. Lang. Class.forname (247) Class. Java:
At org, apache hadoop. Conf. Configuration. GetClassByName (802) Configuration. Java:
At org, apache hadoop. Conf. Configuration. GetClass (847) Configuration. Java:
. 13 more