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java.lang.NullPointerException: 	at org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator.getDelegationToken(DelegationTokenAuthenticator.java:170)	at org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticatedURL.getDelegationToken(DelegationTokenAuthenticatedURL.java:371)	at org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl$2.run(TimelineClientImpl.java:359)	at org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl$2.run(TimelineClientImpl.java:351)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)	at org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl$5.run(TimelineClientImpl.java:451)	at org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl$TimelineClientConnectionRetry.retryOn(TimelineClientImpl.java:183)	at org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl.operateDelegationToken(TimelineClientImpl.java:466)	at org.apache.hadoop.yarn.client.api.impl.TimelineClientImpl.getDelegationToken(TimelineClientImpl.java:363)	at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.getTimelineDelegationToken(YarnClientImpl.java:348)	at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.addTimelineDelegationToken(YarnClientImpl.java:329)	at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.submitApplication(YarnClientImpl.java:249)	at org.apache.hadoop.mapred.ResourceMgrDelegate.submitApplication(ResourceMgrDelegate.java:290)	at org.apache.hadoop.mapred.YARNRunner.submitJob(YARNRunner.java:290)	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:240)	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290)	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287)	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308)	at org.apache.hadoop.mapreduce.SleepJob.run(SleepJob.java:273)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)	at org.apache.hadoop.mapreduce.SleepJob.main(SleepJob.java:194)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)	at org.apache.hadoop.test.MapredTestDriver.run(MapredTestDriver.java:130)	at org.apache.hadoop.test.MapredTestDriver.main(MapredTestDriver.java:138)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.util.RunJar.run(RunJar.java:221)	at org.apache.hadoop.util.RunJar.main(RunJar.java:136)