Changing current page from backing file

Question

Using WL 8.1 SP4
I have a User Acceptance Policy page in my portal, and I want to ensure that users have viewed this page before I allow them to view any other content.
When users have viewed the UAP, I set a session variable. I then use the session variable in my entitlements, so there's no problem with them viewing content they shouldn't.
The problem I have is that if users try to access a page directly (or their session has expired), they're left with a blank page (as they're not entitled to see anything), rather than being sent to something helpful (i.e. the UAP).
So I need a backing file. It can either be on every page (except the UAP), or I can put it on the book - whatever is recommended.
I've tried this as a page backing file:
public class UAPCheck extends AbstractJspBacking {
public boolean handlePostbackData(HttpServletRequest request, HttpServletResponse response){
PageBackingContext pbc = PageBackingContext.getPageBackingContext(request);
if (pbc.getLabel().equals("uap_page")
|| request.getSession().getAttribute("UAP Accepted") != null){
return true;
} else {
pbc.setupPageChangeEvent("uap_page");
return true;
I've applied this to pages in my book, however nothing happens - the page change request never fires!
So what's happening here? Am I misunderstanding what setupPageChangeEvent is for?
Help is appreciated.
darren

Answer 1

In the past I have done it as follows:
1. Create a backing file for the book that has these pages.
2. In the preRender of the backing file do the following
BookBackingContext bbc=
BookBackingContext.getBookBackingContext(getRequest());
if( //check to see if page change event is needed)
{PageBackingContext pbc_current =
        bbc.getActivePageBackingContext();
    pbc_default.setActive(false);
    PageBackingContext pbc_pageToBeShown=
        bbc.getPageBackingContextByDefinitionLabel("//  
        def label of page to be shown, in your      
        case 'uap_page'");
    pbc_pageToBeShown.setActive(true);
    return true;
else return true;
3. link the backing file to book
Recommendations:
* Don't use backing files for Portal components if they are not needed. (From your post, if I am not wrong, you are using backing files for all pages in the book which is not necessary and can cause unnecessary complications)
* Read this doc to understand life-cycle methods of portal components http://edocs.bea.com/wlp/docs81/pdf/taxonomy.pdf
Peruse the above document to understand what is going wrong with your code.
* Remember that the life cycle methods for components that are not active will not be rendered if treeOptimizationEnable parameter is set to true ( this parameter can be seen in workshop under property editor)
* When calling one of the setupxxevent methods, it must be done on the backing context that the backing file is tied to. If you do not do this the event may not get fired. For more info click http://e-docs.bea.com/wlp/docs81/whitepapers/netix/body.html
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