code: Map<String, Object> bindStrutsContext(Object action) {
  		Map<String, Object> variables = new HashMap<String, Object>();
  		variables.put(ACTION_VARIABLE_NAME, action);
  
  		if ( action instanceof ActionSupport) {
  			ActionSupport actSupport = (ActionSupport)action;
  
  			// Struts2 field errors.( Map<fieldname , fielderrors>)
  			Map<String, List<String>> fieldErrors = actSupport.getFieldErrors();
  			variables.put(FIELD_ERRORS_NAME, fieldErrors);
  		}
  
  		return variables;
  	}
docs: Binding Struts2 action and context, and field-errors list binding "field".
  @param action Action instance
  @return ContextMap