code: public static void addValidationError( String propertyName, String messageKey, Object messageArg,
                                             ServletRequest request )
      {
          addActionError( request, propertyName, messageKey, new Object[]{ messageArg } );
      }
docs: Add a validation error that will be shown with the Errors and Error tags.
  @deprecated Use {@link #addActionError(ServletRequest, String, String, Object[])} instead.
  
  @param propertyName the name of the property with which to associate this error.
  @param messageKey the message-resources key for the error message.
  @param messageArg an argument for the error message.
  @param request the current ServletRequest.