Null Pointer exception while submitting Mapreduce job from Eclipse (windows platform) to remote cluster(unix platform)

We are building a stand alone windows application in Java which submits a Mapreduce job using runHadoopJob() method to a remote Unix cluster. Getting null pointer exception in the process.Iam using Jars of Hadoop 2.5 distribution,copied winutils.exe to the bin folder and cross platform flag is also set to true. Below is the trace of exception.

PS : same code is running without any issues in Cloudera quick start VM.

java.lang.NullPointerException
at java.lang.ProcessBuilder.start(Unknown Source)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:482)
at org.apache.hadoop.util.Shell.run(Shell.java:455)
at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:702)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:791)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:774)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:646)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:434)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:282)
at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:435)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1295)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1292)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Unknown Source)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1642)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1292)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1313)
at com.deloitte.dmart.hadoop.MapreduceDriver.runHadoopJob(MapreduceDriver.java:109)
at com.deloitte.dmart.panels.SourceAndTargetTabbedPanel$FileTask.doInBackground(SourceAndTargetTabbedPanel.java:459)
at com.deloitte.dmart.panels.SourceAndTargetTabbedPanel$FileTask.doInBackground(SourceAndTargetTabbedPanel.java:1)
at javax.swing.SwingWorker$1.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at javax.swing.SwingWorker.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)