Re: Ajax request handled by backing bean

Question

I have a servlet that is handling an Ajax request for a page. This works very well, however i am struggling with using an event handler in my backing bean to handle this request. It seems like the reqest does not get routed to the backing bean when i try to use it as the url.
Any guidance would be appreciated.
Thanks

Answer 1

To execute a backing bean method from your servlet, you must first make the FacesContext available to your doGet or doPost method. To learn how to make the FacesContext available, look at the init method (and the doGet method) in the 5655_ajaxcreator/ajaxcreator/exercises/exercise1/EmployeeValidationServlet.java in the JavaOne Hands-On Lab 5655. There is a link to the Lab 5655 zip file on this page:
http://developers.sun.com/prodtech/javatools/jscreator/community/javaone/creatorteam.html
Once you have emulated the EmployeeValidationServlet.init method to make the FacesContext available to your doGet or doPost method, use code like the following to execute your backing bean method and write out a response:
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
// Acquire the FacesContext instance for this request
FacesContext context =
facesContextFactory.getFacesContext(servletConfig.getServletContext(), request,
response, lifecycle);
MethodBinding mb = context.getApplication().
createMethodBinding(...);
mb.invoke(context, new Object[]{...});
response.setContentType("text/xml");
response.setHeader("Pragma", "No-Cache");
response.setHeader("Cache-Control", "no-cache,no-store,max-age=0");
response.setDateHeader("Expires", 1);
response.getWriter().write("<message>hello world</message>");
}