【100分】请教关于Servlet3.0 + Tomcat7.0.x 异步调用的问题

@WebServlet(urlPatterns="/test",asyncSupported=true)

public class ModuleAsyncServlet extends HttpServlet {

@Override

	protected void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		try {

			response.setCharacterEncoding("UTF-8");

			Writer out = response.getWriter();

//			request.startAsync(); //报异常

			AsyncContext ctx = request.getAsyncContext();//null

			System.out.println(request.isAsyncSupported());  //false

异常信息如下

java.lang.IllegalStateException: Not supported.
at org.apache.catalina.connector.Request.startAsync(Request.java:1594)
at org.apache.catalina.connector.Request.startAsync(Request.java:1587)
at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1024)
at org.async.servlet.ModuleAsyncServlet.doGet(ModuleAsyncServlet.java:35)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)



=======================


当我提交一个 test请求的时候 ， 可以进入到 get 方法中
并执行，当执行到request.startAsync()的时候， 会报如上异常

环境 jdk.1.6.0_22 apache7.0.6 正式版


=======================================

这个问题解决一上午了， 郁闷 不知道咋办



完整代码如下

package org.async.servlet;



import java.io.IOException;

import java.io.PrintWriter;

import java.io.Writer;

import java.util.Date;



import javax.servlet.AsyncContext;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



@WebServlet(urlPatterns="/test",asyncSupported=true)

public class ModuleAsyncServlet extends HttpServlet {



	/**

	 * 

	 */

	private static final long serialVersionUID = 1L;





	@Override

	protected void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		try {

			response.setCharacterEncoding("UTF-8");

			Writer out = response.getWriter();

			request.startAsync();

			AsyncContext ctx = request.getAsyncContext();

			System.out.println(request.isAsyncSupported());

			//AsyncContext ctx = request.startAsync();

			new Thread(new Executor(ctx)).start();

			out.write("结束Servlet的时间：" + new Date() + ".");

			out.flush();

		} catch (Exception e) {

			e.printStackTrace();

		}

	}



	@Override

	protected void doPost(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		super.doPost(req, resp);

	}



}



class Executor implements Runnable {

	private AsyncContext ctx = null;



	public Executor(AsyncContext ctx) {

		this.ctx = ctx;

	}



	public void run() {

		try {

			// 等待十秒钟，以模拟业务方法的执行

			Thread.sleep(10000);

			PrintWriter out = ctx.getResponse().getWriter();

			out.println("业务处理完毕的时间：" + new Date() + ".");

			out.flush();

			ctx.complete();

		} catch (Exception e) {

			e.printStackTrace();

		}

	}

}