No thread-bound request found: Are you referring to request attributes outside of an actual web requ

今天收到一个bug，乍一看是个陌生面孔。

报错信息

No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

看了一下是在spring-web中RequestContextHolder.currentRequestAttributes方法抛出来的。

 /*** Return the RequestAttributes currently bound to the thread.* <p>Exposes the previously bound RequestAttributes instance, if any.* Falls back to the current JSF FacesContext, if any.* @return the RequestAttributes currently bound to the thread* @throws IllegalStateException if no RequestAttributes object* is bound to the current thread* @see #setRequestAttributes* @see ServletRequestAttributes* @see FacesRequestAttributes* @see javax.faces.context.FacesContext#getCurrentInstance()*/public static RequestAttributes currentRequestAttributes() throws IllegalStateException {RequestAttributes attributes = getRequestAttributes();if (attributes == null) {if (jsfPresent) {attributes = FacesRequestAttributesFactory.getFacesRequestAttributes();}if (attributes == null) {throw new IllegalStateException("No thread-bound request found: " +"Are you referring to request attributes outside of an actual web request, " +"or processing a request outside of the originally receiving thread? " +"If you are actually operating within a web request and still receive this message, " +"your code is probably running outside of DispatcherServlet/DispatcherPortlet: " +"In this case, use RequestContextListener or RequestContextFilter to expose the current request.");}}return attributes;}

看了方法注释说，如果当前线程没有绑定请求request的属性，就会报这个错。

问题排查

可是我们有用到HttpServletRequest相关的属性，怎么会报这个错呢？
最终发现，我们私库里的代码，根据国际化获取提示信息的一段。

    /*** 获取国际化消息.* * @param code*            代码* @param args*            参数* @return 国际化消息*/public String getMessage(String code, Object... args) {Locale locale = localeResolver.resolveLocale(WebUtil.getRequest());return messageSource.getMessage(code, args, locale);}

其中WebUtil.getRequest()就是获取这个RequestAttributes的方法。

    /*** Gets the request.* * @return the request*/public static HttpServletRequest getRequest() {ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();return attr.getRequest();}

发现问题所在了。

问题分析

在之前的方法调用的没有发现这个问题，原因是请求中会包含HttpServletRequest对象，不会报错。而我这次的调用是将流程移到异步线程中执行，中途丢失了HttpServletRequest对象，所以就获取不到，报这个错。

解决方法

本次我是直接调了另外一个方法，跳过了获取Locale的步骤。

    /*** 获取国际化消息.* @param code   代码* @param args  参数* @return 国际化消息*/public String getMessageWithDefaultLocale(String code, Object... args) {return messageSource.getMessage(code, args, Locale.SIMPLIFIED_CHINESE);}

另外就需要考虑将HttpServletRequest对象设置到异步线程池的线程中。

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