code: def _get_jar_fp(self):
          
          # handles case where the jar file is in the current working directory
          if os.path.exists(self._command):
              return self._command
          # handles the case where the user has specified the location via
          # an environment variable
          elif 'RDP_JAR_PATH' in environ:
              return getenv('RDP_JAR_PATH')
          else:
              return None
docs: Returns the full path to the JAR file.
  
          If the JAR file cannot be found in the current directory and
          the environment variable RDP_JAR_PATH is not set, returns
          None.