Servlet 3.0 async NOT working on Tomcat 7.0.27 on Windows

[rohit patil]

Hi All,
I have written the below piece of code (NewServlet.java) to try the Servlet
3.0 async feature.
But it is failing by throwing up the below mentioned error.

Tomcat Version: 7.0.27 (32 bit)
OS: Windows 7

java.lang.IllegalStateException: Not supported.
    at org.apache.catalina.connector.Request.startAsync(Request.java:1664)
    at
org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1030)
    at
javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:379)

code snippet:
   try{
            boolean asynSupported = request.isAsyncSupported();
            System.out.println("asynSupported: "+asynSupported);
            AsyncContext async = request.startAsync(request,
response);   *//exception
is thrown at this point
*            messageSender.addConnection(async);
            AlertListener alertListener = new AlertListener(messageSender);
            async.start(alertListener);

        } catch (Throwable thr){
            thr.printStackTrace();
        }

web.xml snippet:

    <servlet>
        <servlet-name>NewServlet</servlet-name>

<servlet-class>sample.comet.NewServlet</servlet-class>
        <async-supported>true</async-supported>
    </servlet>


server.xml snippet :

<Connector connectionTimeout="20000" port="8084"
protocol="org.apache.coyote.http11.Http11NioProtocol" redirectPort="8443"/>

Even the sample program "AsyncRequest" that comes with tomcat does not
work. :-(   it also throws the same exception.