wuyouzhuguli/SpringAll · warning · ValidateCodeException

验证码不能为空！

Error message

验证码不能为空！

What it means

Thrown by ValidateCodeFilter.validateCode in the Logout project when a POST /login is missing a blank/absent 'imageCode' request parameter. Identical logic to the SessionManager project: a ValidateCodeException from the first captcha gate, routed to AuthenticationFailureHandler.

Source

Thrown at 60.Spring-Security-Logout/src/main/java/cc/mrbird/validate/code/ValidateCodeFilter.java:48

    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        if (StringUtils.equalsIgnoreCase("/login", httpServletRequest.getRequestURI())
                && StringUtils.equalsIgnoreCase(httpServletRequest.getMethod(), "post")) {
            try {
                validateCode(new ServletWebRequest(httpServletRequest));
            } catch (ValidateCodeException e) {
                authenticationFailureHandler.onAuthenticationFailure(httpServletRequest, httpServletResponse, e);
                return;
            }
        }
        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }

    private void validateCode(ServletWebRequest servletWebRequest) throws ServletRequestBindingException {
        ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
        String codeInRequest = ServletRequestUtils.getStringParameter(servletWebRequest.getRequest(), "imageCode");

        if (StringUtils.isBlank(codeInRequest)) {
            throw new ValidateCodeException("验证码不能为空！");
        }
        if (codeInSession == null) {
            throw new ValidateCodeException("验证码不存在！");
        }
        if (codeInSession.isExpire()) {
            sessionStrategy.removeAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);
            throw new ValidateCodeException("验证码已过期！");
        }
        if (!StringUtils.equalsIgnoreCase(codeInSession.getCode(), codeInRequest)) {
            throw new ValidateCodeException("验证码不正确！");
        }
        sessionStrategy.removeAttribute(servletWebRequest, ValidateController.SESSION_KEY_IMAGE_CODE);

    }

}

View on GitHub (pinned to 614d2578d9)

Solutions

  1. Include a parameter named 'imageCode' in the POST /login body.
  2. Verify the front-end input name equals 'imageCode'.
  3. Ensure the filter only intercepts /login POST.
  4. Gate validateCode on param presence if captcha is optional on some flows.

Example fix

// before
formData.append("captcha", userTypedCode);

// after
formData.append("imageCode", userTypedCode);
Defensive patterns

Strategy: validation

Validate before calling

// client-side: ensure imageCode present before submit
const code = form.get('imageCode');
if (!code || !code.trim()) { showError('请输入验证码'); return; }

Try / catch

// AuthenticationFailureHandler surfaces the message; do not swallow.

Prevention

When it happens

Trigger: A POST /login form submission that omits imageCode, sends it empty, or uses a different field name. Filter runs only for requestURI '/login' and POST.

Common situations: Front-end field named differently; AJAX login missing the captcha; field disabled/hidden.

Related errors

AI-assisted analysis of wuyouzhuguli/SpringAll@614d2578d9 (2026-08-14). Data as JSON: /api/errors/05e75125150a0de2. Report an issue: GitHub.