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java.lang.NullPointerException: 	at java.lang.ProcessBuilder.start(Unknown Source)	at org.apache.hadoop.util.Shell.runCommand(Shell.java:445)	at org.apache.hadoop.util.Shell.run(Shell.java:418)	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:650)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:739)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:722)	at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getUnixGroups(ShellBasedUnixGroupsMapping.java:83)	at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getGroups(ShellBasedUnixGroupsMapping.java:52)	at org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback.getGroups(JniBasedUnixGroupsMappingWithFallback.java:50)	at org.apache.hadoop.security.Groups.getGroups(Groups.java:139)	at org.apache.hadoop.security.UserGroupInformation.getGroupNames(UserGroupInformation.java:1418)	at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.open(HiveMetaStoreClient.java:352)	at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.(HiveMetaStoreClient.java:214)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)	at java.lang.reflect.Constructor.newInstance(Unknown Source)	at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1411)	at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.(RetryingMetaStoreClient.java:62)	at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:72)	at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:2444)	at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2456)	at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:341)	at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:292)	at org.apache.hive.service.cli.session.SessionManager.applyAuthorizationConfigPolicy(SessionManager.java:88)	at org.apache.hive.service.cli.session.SessionManager.init(SessionManager.java:63)	at org.apache.hive.service.CompositeService.init(CompositeService.java:59)	at org.apache.hive.service.cli.CLIService.init(CLIService.java:110)	at org.apache.hive.service.cli.thrift.EmbeddedThriftBinaryCLIService.(EmbeddedThriftBinaryCLIService.java:35)	at org.apache.hive.jdbc.HiveConnection.(HiveConnection.java:164)	at org.apache.hive.jdbc.HiveDriver.connect(HiveDriver.java:105)	at java.sql.DriverManager.getConnection(Unknown Source)	at java.sql.DriverManager.getConnection(Unknown Source)	at testproject.hive_test_0_1.Hive_Test.tHiveConnection_1Process(Hive_Test.java:371)	at testproject.hive_test_0_1.Hive_Test.runJobInTOS(Hive_Test.java:1063)	at testproject.hive_test_0_1.Hive_Test.main(Hive_Test.java:922)