如何避免ASYNC_SUPPORTED =请求集真在Tomcat 7中启用异步的servlet 3.0处理？ [英] How to avoid request set ASYNC_SUPPORTED=true to enable async servlet 3.0 processing on Tomcat 7?

问题描述

继报道了这一问题<一href=\"http://stackoverflow.com/questions/7749350/illegalstateexception-not-supported-on-asynccontext-startasyncreq-res\">question,找到了解决办法：

Following an issue reported on this question, a solution was found:

req.setAttribute("org.apache.catalina.ASYNC_SUPPORTED", true);

这似乎有点奇怪，是不是真的便携code（它不会伤害，但是......）。通过的NetBeans 7.0.1在交付这似乎具体到Tomcat 7.我使用Tomcat 7.0.14。

This seems a bit strange and is not really 'portable' code (it won't hurt, but...). It seems specific to Tomcat 7. I am using Tomcat 7.0.14 as delivered by NetBeans 7.0.1.

我找不到文件说明，有必要启用的servlet 3.0异步请求处理与卡特琳娜属性。我找不到文件说明在Tomcat的配置水平太特别的东西是必要的。

I could not find documentation indicating it is necessary to enable async request processing in servlet 3.0 with a catalina attribute. I could not find documentation indicating something special was necessary at the Tomcat configuration level too.

有没有办法来避免设置 ASYNC_SUPPORTED = TRUE 中的每一个请求，以使异步的servlet 3.0处理Tomcat 7的？

Is there a way to avoid having to set ASYNC_SUPPORTED=true in each request to enable async servlet 3.0 processing in Tomcat 7?

推荐答案

一对夫妇的事情，首先检查：

A couple of things to check first:

请确保在请求操作也支持异步（如解决的答案之一的问题的任何过滤器你引用）。

Make sure any filters that operate on the request also support async (as addressed in one of the answers to the question you referenced).

请确保您使用一个Servlet 3.0 web.xml中 - 例如：

Make sure you're using a Servlet 3.0 web.xml - for example:

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="true">

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