Java Network Programming using UDP protocol

Question

I am trying to send the object using UDP protocol.
In my client class it is giving me NullPointer excetion at clientSocket.send(sendPacket); although sendPacket is not null it has the value that I am passing.
Here is the code :
private boolean clientSrvrComm(AuditorData audData) throws Exception
          boolean result = false;
          ByteArrayOutputStream barray_out = new ByteArrayOutputStream();
          ObjectOutputStream obj_out = new ObjectOutputStream(barray_out);
          obj_out.flush();
          obj_out.writeObject(audData);
          obj_out.flush();
          // sending the data to the server
          byte[] sendData = barray_out.toByteArray();
          DatagramPacket sendPacket = new DatagramPacket(sendData,sendData.length,IPAddress,serverPort);
          clientSocket.send(sendPacket); // getting exception at this line
          return result;
     } // method end
I am passing audData through main method.
Any help would be appreciate.
Thanks,
Swati

Answer 1

actually it shouldn't give the null pointer exception and send the object to the server.
I am not able to get, why it is throwing the exception, even there is no class for debugging.