I can't run a below code.

@WebServlet(urlPatterns={"/async"}, asyncSupported=true)
public class AsyncServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		AsyncContext context = request.startAsync(request, response);
		
		context.start(new Runnable() {
			@Override
			public void run() {
				System.out.println("async!!");
			}
		});
	}
}

It occur java.lang.StackOverflowError.

java.lang.StackOverflowError
	at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:963)
	at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:963)
	at org.apache.catalina.connector.RequestFacade.startAsync(RequestFacade.java:963)
.
.
.

So, I think that org.apache.catalina.connector.RequestFacade has wrong implementation.I show part of source code in RequestFacade line number is 961 to 964.

public AsyncContext startAsync(ServletRequest request, ServletResponse response)
    throws IllegalStateException {
    return request.startAsync(request, response);
}

I think it should have "this." before "request" next "return".