code: public static Util instance() {
          if (_instance == null) {
              System.err.println("Util is not initialised !!!");
              System.err.println("Exiting");
              System.exit(-1);
          }
          return _instance;
      }
docs: Get the singleton object reference.
  <p>
  This method returns a reference to the object of the Util class. If the
  class has not been initialised with it's init method, this method print a
  message and abort the device server process
  
  @return The Util object reference