custom error messsage not showing on dispatcher

Hi There,

The following code works if I hit directly on the Author instance it works but i doesn't work on the dispatcher side. the message is not shown. any advice what i could be doing wrong here.

response.getWriter().write(String.format("<div><p id='Status'>400</p><p id='Message'>%s</p></div>", msg));
response.setContentType(ContentType.TEXT_HTML.getMimeType());
response.setStatus(400);