DispatcherServletAsyncRequestExcerpt

public class DispatcherServlet extends FrameworkServlet {

  protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {
    ...
    // Actually invoke the handler.
    mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

    if (asyncManager.isConcurrentHandlingStarted()) {
      return;
    }
    
    processDispatchResult(processedRequest, response, mappedHandler, mv, dispatchException);
    ...
  }

}