ISSUE:- /var/log/ambari-server/ambari-server.log 18 May 2017 07:56:33,754 WARN [ambari-client-thread-26] PermissionHelper:78 - Error occurred when cluster or view is searched based on resource id java.lang.NullPointerException at org.apache.ambari.server.security.authorization.PermissionHelper.getPermissionLabels(PermissionHelper.java:74) 18 May 2017 07:56:33,975 ERROR [ambari-client-thread-26] ContainerResponse:419 - The RuntimeException could not be mapped to a response, re-throwing to the HTTP container com.google.common.cache.CacheLoader$InvalidCacheLoadException: CacheLoader returned null for key 58. at com.google.common.cache.LocalCache$Segment.getAndRecordStats(LocalCache.java:2348) at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2318) at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) 18 May 2017 07:56:33,977 WARN [ambari-client-thread-26] ServletHandler:561 - Error Processing URI: /api/v1/users/admin - (com.google.common.cache.CacheLoader$InvalidCacheLoadException) CacheLoader returned null for key 58. 18 May 2017 07:56:33,977 WARN [ambari-client-thread-26] ServletHandler:561 - Error Processing URI: /api/v1/users/admin - (com.google.common.cache.CacheLoader$InvalidCacheLoadException) CacheLoader returned null for key 58. ROOT CAUSE:- Zeppelin View is removed from ambari 2.5 but looks like a reference stays there. SOLUTION:- Check this by running the following query on ambari DB. # psql -U ambari ambari Password for user ambari: bigdata psql => command -U ambari => is the username ambari => is the DB name It will ask for password, Where we can try using the ambari's default password as "bigdata" If the password is changed then we can check the file. # grep 'server.jdbc.user.passwd' /etc/ambari-server/conf/ambari.properties server.jdbc.user.passwd=/etc/ambari-server/conf/password.dat# cat /etc/ambari-server/conf/password.datbigdata So please get the "resource_id" of Zeppelin View if present?(In my case it is 58) # select * from adminresourcetype; # select * from adminresourcetype; where resource_type_id IN (select resource_type_id from adminresource where resource_id =58); If that is the case then please Take Ambari DB Dump and then run the following commands to clean the Zeppelin View reference: # psql -U ambari ambari Password for user ambari: bigdata # DELETE FROM adminprivilege where resource_id in(58); # DELETE FROM adminresource where resource_id in(58); Then restart Ambari Server # ambari-server restart ... View more