code: @Override
      public void init(final FilterConfig _filterConfig)
          throws ServletException
      {
          super.init(_filterConfig);
          try {
              this.loginHandler = new LoginHandler(AppAccessHandler.getApplicationKey());
          } catch (final EFapsException e) {
              AbstractAuthenticationFilter.LOG.error("AppAccessHandler", e);
          }
      }
docs: Called by the web container to indicate to a filter that it is being
  placed into service. The servlet container calls the init method exactly
  once after instantiating the filter. The init method must complete
  successfully before the filter is asked to do any filtering work.
  
  The web container cannot place the filter into service if the init method
  either 1.Throws a ServletException 2.Does not return within a time period
  defined by the web container // sets the login handler
  
  @param _filterConfig filter configuration instance
  @see #INIT_PARAM_TITLE
  @see #title
  @see #INIT_PARAM_APPLICATION
  @see #loginhandler
  @throws ServletException on error