Well,
if you are *inside* a Faces Request (gone through the FacesServlet)
you get a FacesContext object when calling FC.getCurrentI...();
outside of a faces req. it will return null, since per each faces req
the FacesContext is *created*
HTH,
Matthias
On 5/17/06, Mike Duffy <[EMAIL PROTECTED]> wrote:
I guess my basic question is, shouldn't I be able to call
"FacesContext.getCurrentInstance()" from
anywhere in my JSF application and have it return a context? Why would it ever
return null?
Mike
--- Julian Ray <[EMAIL PROTECTED]> wrote:
> Hi Mike,
>
> Here is some code which shows how we get the faces context in a servlet. It
also has a utility
> method retrieving managed beans.
>
> public abstract class AbstractFacesServlet extends HttpServlet {
>
> /** Creates a new instance of AbstractFacesServlet */
> public AbstractFacesServlet() {
> super();
> }
> public void init(ServletConfig config) throws ServletException {
> super.init(config);
> }
> protected abstract void processRequest(HttpServletRequest request,
HttpServletResponse
> response) throws ServletException, IOException;
>
> /** Handles the HTTP <code>GET</code> method.
> * @param request servlet request
> * @param response servlet response
> */
> protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws
> ServletException, IOException {
> processRequest(request, response);
> }
> protected void log(FacesContext facesContext, String message) {
> facesContext.getExternalContext().log(message);
> }
> /** Handles the HTTP <code>POST</code> method.
> * @param request servlet request
> * @param response servlet response
> */
> protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws
> ServletException, IOException {
> processRequest(request, response);
> }
> protected FacesContext getFacesContext(HttpServletRequest request,
HttpServletResponse
> response) {
> FacesContext facesContext = FacesContext.getCurrentInstance();
> if (facesContext == null) {
>
> FacesContextFactory contextFactory =
>
(FacesContextFactory)FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
> LifecycleFactory lifecycleFactory =
> (LifecycleFactory)FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
> Lifecycle lifecycle =
> lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);
>
> facesContext =
> contextFactory.getFacesContext(request.getSession().getServletContext(),
request, response,
> lifecycle);
>
> // Set using our inner class
> InnerFacesContext.setFacesContextAsCurrentInstance(facesContext);
>
> // set a new viewRoot, otherwise context.getViewRoot returns null
> UIViewRoot view =
> facesContext.getApplication().getViewHandler().createView(facesContext,
"cms");
> facesContext.setViewRoot(view);
> }
> return facesContext;
> }
> protected Object getBean(String beanName, FacesContext facesContext) {
> return
getApplication(facesContext).getVariableResolver().resolveVariable(facesContext,
> beanName);
> }
> // You need an inner class to be able to call
FacesContext.setCurrentInstance
> // since it's a protected method
> private abstract static class InnerFacesContext extends FacesContext {
> protected static void setFacesContextAsCurrentInstance(FacesContext
facesContext) {
> FacesContext.setCurrentInstance(facesContext);
> }
> }
> }
>
>
> ----- Original Message ----
> From: Mike Duffy <[EMAIL PROTECTED]>
> To: [email protected]
> Sent: Wednesday, May 17, 2006 12:43:28 PM
> Subject: Can the FacesContext be Accessed from Outside of a Backing Bean?
>
> If I call the following from inside a backing bean, everything works fine:
>
> User user = (User)
>
FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get(Constants.USER_KEY);
>
> However, if I make the same call from an object in the session or from a
utilty class, I get a
> null pointer on "FacesContext.getCurrentInstance()".
>
> Can the FacesContext be accessed from outside of a backing bean?
>
> Thx.
>
> Mike
>
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Matthias Wessendorf
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48282 Emsdetten
http://jroller.com/page/mwessendorf
mwessendorf-at-gmail-dot-com
