alLink">IllegalStateException</a></code> - if the request is within the scope of a filter or servlet that does not support
 asynchronous operations (that is, <a href="#isAsyncSupported()"><code>isAsyncSupported()</code></a> returns false), or if this method is called again without
 any asynchronous dispatch (resulting from one of the <a href="AsyncContext.html#dispatch()"><code>AsyncContext.dispatch()</code></a> methods), is called outside the
 scope of any such dispatch, or is called again within the scope