code: private ControllerErrorHandler getContextErrorHandler(XmlWebApplicationContext context) {
          ControllerErrorHandler errorHandler = null;
          String[] names = context.getBeanNamesForType(ControllerErrorHandler.class);
          for (int i = 0; errorHandler == null && i < names.length; i++) {
              errorHandler = (ControllerErrorHandler) context.getBean(names[i]);
              Class<?> userClass = ClassUtils.getUserClass(errorHandler);
              if (userClass.isAnnotationPresent(Ignored.class)) {
                  logger.debug("Ignored controllerErrorHandler: " + errorHandler);
                  errorHandler = null;
                  continue;
              }
          }
          return errorHandler;
      }
docs: 错误处理器，只从本容器找，不从父容器找