code: public static SelectManagerJni create()
    {
      try {
        if (! isEnabled()) {
          return null;
        }
  
        SelectManagerJni pollManager = _jniSelectManager.get();
        
        if (pollManager == null) {
          pollManager = new SelectManagerJni();
  
          // The start is responsible for checking if the select manager
          // is enabled on this system.
          if (pollManager.start()) {
            _jniSelectManager.set(pollManager);
          }
        }
  
        return _jniSelectManager.get();
      } catch (ConfigException e) {
        log.finer(e.toString());
      } catch (Throwable e) {
        log.log(Level.FINER, e.toString(), e);
      }
  
      return null;
    }
docs: Returns a jni select manager.