Servlet 3.0 Async-supported does not work

Here is my web.xml

    <filter>
    <filter-name>pollingTest</filter-name>
    <filter-class>
        webapp.controller.core.servlet.PollingService
            </filter-class>
    <async-supported>true</async-supported>
</filter>
<filter-mapping>
    <filter-name>pollingTest</filter-name>
    <url-pattern>/app/poll</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>ASYNC</dispatcher>
</filter-mapping>

Here is the class:

public class PollingService implements Filter {
Logger logger = LoggerFactory.getLogger(getClass());

@Override
public void destroy() {
    lo开发者_开发问答gger.info("Destroy");
}

@Override
public void doFilter(ServletRequest req, ServletResponse res,
        FilterChain chain) throws IOException, ServletException {

    logger.info("Running");
    req.startAsync(req, res);
    this.doFilter(req, res, chain);
    return;
}

@Override
public void init(FilterConfig arg0) throws ServletException {

    logger.info("Init=");
}

}

I run it on glassfish and also on tomcat 7, got exception:

java.lang.IllegalStateException: Request is within the scope of a filter or servlet that does not support asynchronous operations
at org.apache.catalina.connector.Request.startAsync(Request.java:3657)
at org.apache.catalina.connector.Request.startAsync(Request.java:3633)
at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:1053)
at javax.servlet.ServletRequestWrapper.startAsync(ServletRequestWrapper.java:450)

Who can help me on this? thanks a lot.

Because your servlet and any other filter in chain must have <async-supported>true</async-supported> in web.xml.

I had a similar problem, but in my case, it was not enough. If you use tags Context and Valve (in tomcat7 - service.xml), you must add parameter asyncSupported="true" in tag value. Then it had worked.

<Context docBase="aaa" path="/aaa" reloadable="true" source="org.eclipse.jst.jee.server:aaa"><Valve className="cz.tomcatUtil.ForceUserValve" user="DZC0GRP" asyncSupported="true"/></Context>

You're calling recursively this.doFilter(req, res, chain);.

If you want continue the chain, you must invoke chain.doFilter(httpRequest, httpResponse); instead of this.doFilter(req, res, chain);.

You can use Annotation for Mapping Asynchronous Servlet like this

@WebServlet(urlPatterns = {"/yourServlet"}, **asyncSupported=true**)

public class YourServlet extends HttpServlet { }

Peter Karabinovich, you answer isn't true. From Servlet 3.0 spec:

2.3.3.3 Asynchronous processing
...
Dispatching from a servlet that has asyncSupported=true to one where asyncSupported is set to false is allowed. In this case, the response will be committed when the service method of the servlet that does not support async is exited...

I know this an old post but I would like to share my solution. It took me 1 week to find out the cause because I had tried almost tried every possible solution.

For me the servlet url-pattern was not correct.

<servlet-mapping>
    <servlet-name>MyServlet</servlet-name>
    <url-pattern>/pattern/</url-pattern> <---
  </servlet-mapping>

Hope it will be of some use.