code: public static ServiceClient getInstance() {
          ServiceAccount account = ServiceAccount.getInstance();
          if (account == null) {
              return null;
          }
          return getInstance(account);
      }
docs: Returns an instance of ServiceClient.
  <p>
  This factory method only works if necessary account information is
  provided via environment variables or VCAP_SERVICES on Bluemix.
  
  @return An instance of ServiceClient, or null if sufficient configuration
  is not provided in the runtime environment.