19/08/12 17:26:56 INFO sessions.InteractiveSessionManager: Registering new session 0
19/08/12 17:26:58 INFO utils.LineBufferedStream: Exception in thread "main" java.lang.NullPointerException
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.livy.rsc.driver.JobWrapper.cancel(JobWrapper.java:90)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.livy.rsc.driver.RSCDriver.shutdown(RSCDriver.java:127)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.livy.rsc.driver.RSCDriver.run(RSCDriver.java:356)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.livy.rsc.driver.RSCDriverBootstrapper.main(RSCDriverBootstrapper.java:93)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at java.lang.reflect.Method.invoke(Method.java:498)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:849)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:167)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:195)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:86)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:924)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:933)
19/08/12 17:26:58 INFO utils.LineBufferedStream:        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)