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java.lang.NullPointerException: 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)	at org.apache.hadoop.util.Shell.runCommand(Shell.java:483)	at org.apache.hadoop.util.Shell.run(Shell.java:456)	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:722)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:815)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:798)	at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:1097)	at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:657)	at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:632)	at org.apache.hadoop.fs.LocatedFileStatus.(LocatedFileStatus.java:49)	at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1729)	at org.apache.hadoop.fs.FileSystem$4.next(FileSystem.java:1711)	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:305)	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:265)	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:387)	at org.apache.spark.rdd.NewHadoopRDD.getPartitions(NewHadoopRDD.scala:121)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:248)	at org.apache.spark.rdd.RDD$$anonfun$partitions$2.apply(RDD.scala:246)	at scala.Option.getOrElse(Option.scala:121)	at org.apache.spark.rdd.RDD.partitions(RDD.scala:246)	at org.apache.spark.streaming.dstream.FileInputDStream$$anonfun$5.apply(FileInputDStream.scala:285)	at org.apache.spark.streaming.dstream.FileInputDStream$$anonfun$5.apply(FileInputDStream.scala:275)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)	at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:35)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)	at scala.collection.AbstractTraversable.map(Traversable.scala:104)	at org.apache.spark.streaming.dstream.FileInputDStream.org$apache$spark$streaming$dstream$FileInputDStream$$filesToRDD(FileInputDStream.scala:275)	at org.apache.spark.streaming.dstream.FileInputDStream.compute(FileInputDStream.scala:155)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream.createRDDWithLocalProperties(DStream.scala:415)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:335)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:333)	at scala.Option.orElse(Option.scala:289)	at org.apache.spark.streaming.dstream.DStream.getOrCompute(DStream.scala:330)	at org.apache.spark.streaming.dstream.MappedDStream.compute(MappedDStream.scala:36)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream.createRDDWithLocalProperties(DStream.scala:415)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:335)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:333)	at scala.Option.orElse(Option.scala:289)	at org.apache.spark.streaming.dstream.DStream.getOrCompute(DStream.scala:330)	at org.apache.spark.streaming.dstream.MappedDStream.compute(MappedDStream.scala:36)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream.createRDDWithLocalProperties(DStream.scala:415)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:335)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:333)	at scala.Option.orElse(Option.scala:289)	at org.apache.spark.streaming.dstream.DStream.getOrCompute(DStream.scala:330)	at org.apache.spark.streaming.dstream.TransformedDStream$$anonfun$6.apply(TransformedDStream.scala:42)	at org.apache.spark.streaming.dstream.TransformedDStream$$anonfun$6.apply(TransformedDStream.scala:42)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.immutable.List.foreach(List.scala:381)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)	at scala.collection.immutable.List.map(List.scala:285)	at org.apache.spark.streaming.dstream.TransformedDStream.compute(TransformedDStream.scala:42)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1$$anonfun$apply$7.apply(DStream.scala:341)	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1$$anonfun$1.apply(DStream.scala:340)	at org.apache.spark.streaming.dstream.DStream.createRDDWithLocalProperties(DStream.scala:415)	at org.apache.spark.streaming.dstream.TransformedDStream.createRDDWithLocalProperties(TransformedDStream.scala:65)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:335)	at org.apache.spark.streaming.dstream.DStream$$anonfun$getOrCompute$1.apply(DStream.scala:333)	at scala.Option.orElse(Option.scala:289)	at org.apache.spark.streaming.dstream.DStream.getOrCompute(DStream.scala:330)	at org.apache.spark.streaming.dstream.ForEachDStream.generateJob(ForEachDStream.scala:48)	at org.apache.spark.streaming.DStreamGraph$$anonfun$1.apply(DStreamGraph.scala:117)	at org.apache.spark.streaming.DStreamGraph$$anonfun$1.apply(DStreamGraph.scala:116)	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)	at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)	at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)	at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)	at scala.collection.AbstractTraversable.flatMap(Traversable.scala:104)	at org.apache.spark.streaming.DStreamGraph.generateJobs(DStreamGraph.scala:116)	at org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$3.apply(JobGenerator.scala:248)	at org.apache.spark.streaming.scheduler.JobGenerator$$anonfun$3.apply(JobGenerator.scala:246)	at scala.util.Try$.apply(Try.scala:192)	at org.apache.spark.streaming.scheduler.JobGenerator.generateJobs(JobGenerator.scala:246)	at org.apache.spark.streaming.scheduler.JobGenerator.org$apache$spark$streaming$scheduler$JobGenerator$$processEvent(JobGenerator.scala:182)	at org.apache.spark.streaming.scheduler.JobGenerator$$anon$1.onReceive(JobGenerator.scala:88)	at org.apache.spark.streaming.scheduler.JobGenerator$$anon$1.onReceive(JobGenerator.scala:87)	at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)