首先，我设置 throwExceptionIfNoHandlerFo‌​und ，使其可以引发异常

@Override
    protected void customizeRegistration(ServletRegistration.Dynamic registration) {
        super.customizeRegistration(registration);
        logger.info("正在注册服务...");
        registration.setInitParameter("enableLoggingRequestDetails", "true");
        registration.setInitParameter("throwExceptionIfNoHandlerFo‌​und","true");
    }

然后，我写了一封信 ControllerAdvice 并使用 ExceptionHandler 处理异常，但它不起作用。那我该怎么办呢。

@ControllerAdvice
public class ErrorPageHandler {
    private final Logger logger = Logger.getLogger(ExceptionHandler.class);
    @ExceptionHandler(NoHandlerFoundException.class)
    public String error404(NoHandlerFoundException ex){
        logger.error(ex.getMessage(),ex.getCause());
        return "404";
    }
}