How can I config exception num by degradeRule with sentinel-spring-webmvc-adapter

[24kpure]

com.alibaba.csp.sentinel.adapter.spring.webmvc.AbstractSentinelInterceptor#preHandle can't feel business exception, I config exception num by degradeRule,but it doesn't work.

[bchengwang]

com.alibaba.csp.sentinel.adapter.spring.webmvc.AbstractSentinelInterceptor#preHandle感觉不到业务异常，我通过degraderRule配置了异常num，但是没有用。

你是不是使用里全局异常处理器？如果使用了全局异常处理器那么异常会被处理器拦截导致AbstractSentinelInterceptor拦截器无法获取到异常信息。

[24kpure]

Nowadays，does it exist that webapplication runs without globalExceptionHandler? I try to extend SentinelWebInterceptor and override mehtod traceExceptionAndExit and make exception visible for sentinel, at last ,it works.

[bchengwang]

如今，是否存在 webapplication 运行时没有globalExceptionHandler？我尝试扩展 SentinelWebInterceptor和覆盖 mehtodtraceExceptionAndExit并使异常对哨兵可见，最后，它起作用了。

可以发一下你重写的SentinelWebInterceptor的代码吗？让我参考一下。谢谢

[24kpure]

  protected void traceExceptionAndExit(Entry entry, Exception ex) {
        if (entry == null) {
            return;
        }
        if (ex == null) {
            HttpServletRequest httpServletRequest = SerialNoUtils.getHttpServletRequest();
            if (httpServletRequest == null) {
                return;
            }

           // you have to make exception visible for sentinel, my plan is quite simple,just put it into request.
            ex = (Exception) httpServletRequest.getAttribute(requestRefExceptionName);
        }

        if (ex != null) {
            Tracer.traceEntry(ex, entry);
        }
        entry.exit();
    }

[24kpure]

#3149 @bchengwang you can have a try ~