Well seting the properties to persistant did the trick. I guess I am
not clear on how the page cycle works yet being new to tapestry. I
would have expected the values not to be null, but I guess I didn't
know that the page was rendered again after submission.
On 7/15/05, Robert Zeigler <[EMAIL PROTECTED]> wrote:
> object should /not/ be initialized on page creation.
> Pages are pooled; state information in the page is not.
> If the page-property is a "persistent" property, it is "attached" at
> page render and "detached" (page property set to null) when the page
> finishes rendering by the framework. If the property is not persistent,
> it is still set back to null at the end of page rendering to prevent
> goofups like user b seeing user a's account information.
> So, you initialize things in pageBeginRender.
> Now, you've inited in pageBeginRender, but you probably don't want to
> re-init when the form is submitted, because you may be "re-initting"
> something that shouldn't be initialized. One solution to this dilemma
> is to do something like:
> pageBeginRender(PageEvent event) {
> if (!event.getRequestCycle.isRewinding()) {
> //initialize objects here.
> }
> }
>
> Then, you use the "hidden" component to store necessary objects at the
> top of your form. Then your object gets re-initialized automatically on
> form submission in time for things after it to not be null.
>
> Or... you can just make the property persistent, depending on your views
> on stateful vs. stateless webapps, session-use, etc.
>
> Robert
>
> Chris Chiappone wrote:
> > now im totally confused. The object should have been initialized on
> > page creation, how come it would become null when submitting the form?
> >
> > On 7/15/05, Danny Mandel <[EMAIL PROTECTED]> wrote:
> >
> >>This error means that your appInfo object is null. So, wherever you
> >>moved your appInfo restoration/initialization logic, it's not getting
> >>called int this case anymore.
> >>
> >>Danny
> >>
> >>Chris Chiappone wrote:
> >>
> >>
> >>>Thanks for the quick responses. The two responses I got were
> >>>basically the same so I tried it. The problem is now I get:
> >>>
> >>>binding: ExpressionBinding[EditApp appInfo.name]
> >>>location: context:/WEB-INF/EditApp.page, line 41, column 58
> >>>
> >>>ognl.OgnlException
> >>>source is null for getProperty(null, "name")
> >>>
> >>>So I am still a bit stuck on what I should do.
> >>>
> >>>On 7/15/05, Danny Mandel <[EMAIL PROTECTED]> wrote:
> >>>
> >>>
> >>>
> >>>>In your pageBeginRender method you can check to see if the form is
> >>>>rewinding. If it is, you probably don't want to initialize things in
> >>>>there i.e.:
> >>>>
> >>>>public void pageBeginRender(PageEvent event) {
> >>>> if (!event.getRequestCycle().isRewinding()) {
> >>>> // do your normal initialization stuff and create if null
> >>>> }
> >>>>}
> >>>>
> >>>>In the case where it is rewinding, then you'll want to move your object
> >>>>retrieval/restoration to a different place. This can be done by binding
> >>>>your object's id to a hidden field that will fetch it or by use of a
> >>>>data squeezer. This has been addressed many times on this list so it
> >>>>should be in the archives and I know that there is a wiki page on using
> >>>>a data squeezer to do this sort of thing:
> >>>>
> >>>>http://wiki.apache.org/jakarta-tapestry/DataSqueezer
> >>>>
> >>>>Hope that helps,
> >>>>Danny
> >>>>
> >>>>Chris Chiappone wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>I am a bit confused about how pageBeginRender works during a form
> >>>>>submission Here is the code i have:
> >>>>>
> >>>>> public void pageBeginRender(PageEvent event) {
> >>>>> // initialize app
> >>>>> retrieveApp(getAppVerId());
> >>>>> }
> >>>>>
> >>>>> private void retrieveApp(Long id){
> >>>>> if(id != null){
> >>>>> System.out.println("Updating App: "+ id);
> >>>>> AppDAO dao = new AppDAO();
> >>>>> AppVer ver = null;
> >>>>> AppInfo info = null;
> >>>>> ver = dao.getAppVerId(id, false);
> >>>>> info = ver.getAppInfo();
> >>>>> setAppInfo(info);
> >>>>> setAppVer(ver);
> >>>>> }
> >>>>> if(getAppInfo() == null){
> >>>>> System.out.println("Creating a new application");
> >>>>> setAppInfo(new AppInfo());
> >>>>> setAppVer(new AppVer());
> >>>>> getAppVer().setRegdate(new Date());
> >>>>> }
> >>>>> }
> >>>>>
> >>>>> /**
> >>>>> * Action taken when this form has been submitted
> >>>>> *
> >>>>> * @param cycle
> >>>>> */
> >>>>> public void formSubmit(IRequestCycle cycle){
> >>>>> System.out.println("Current VerId = "+ getAppVerId());
> >>>>> // Check to see all validation was a success
> >>>>> ValidationDelegate delegate =
> >>>>>(ValidationDelegate)getBeans().getBean("delegate");
> >>>>>
> >>>>> if(!delegate.getHasErrors()){
> >>>>> // Insert the new version
> >>>>> AppDAO dao = new AppDAO();
> >>>>> AppInfo info = getAppInfo();
> >>>>> AppVer ver = getAppVer();
> >>>>>
> >>>>>....
> >>>>>
> >>>>>Basically I need to initialize the AppInfo and AppVer objects when the
> >>>>>page is rendered. The page is an add/edit form. If appVerId is not
> >>>>>null I lookup AppInfo and AppVer to populate my form for editing, if
> >>>>>null create new objects. This seems to work fine. THe problem I am
> >>>>>having is that when I submit the form It create a new AppVer and
> >>>>>AppInfo because appVerId appears to be null in pageBeginRender(Event)
> >>>>>but when it continues to formSubmit my print is showing the the
> >>>>>appVerId != null which is what I expect. The problem is the objects
> >>>>>have been intialized as new so it ends up creating duplicates. Hope I
> >>>>>made this clear.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
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> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>
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> >>
> >>
> >
> >
> >
>
>
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>
--
~chris
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