I was just going through that code ... ----- Original Message ----- From: "Jason Owens" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, September 18, 2002 6:07 PM Subject: Re: [Tapestry-developer] attach() not called
> Just found out some more interesting info: > > attach() *is* being called on the page, but it seems a component within > the page is accessing a *different* instance of the same page (one that > hasn't been initialized with an engine). The only connection between the > page and component is the "model" parameter, which is specified as > direction="in" and required="yes". Does Tapestry randomly grab components > from the pool as well as pages, and then put them together for a render? Does your "model" instance contain a reference to a page? If it is persistant (meaning it has a different lifecycle than the page it is on), it should not. Remember that persistent page state is *seperate* from page instances. Sounds like page instance B (attached to the engine) has a reference (inside the model) to page instance A (which is still in the pool and in a detached state). You are going to have to rig things so that the model stores the *name* of the page, and resolves it from the request cycle. Alternately, you can leverage some event notifications to set the page property of the model as needed. > If this is so, then the component/page relationship isn't being properly > set. > I'll try to look at the Tapestry code later tonight to see what I find, > right now I've got plenty of other bugs to fix... (This does manifest more > often when more than one person is using the app.) > -Jason > > > > I'll have to check into the PageLoader. I know I moved > > some stuff around, so that the engine property would be > > set by the time that finishLoad() was invoked on a page, > > or any component of the page. I must have screwed > > something up there. Strangely, I do run Tapestry with > > caching enabled but I haven't seen this! > > > > -- > > [EMAIL PROTECTED] > > > > http://tapestry.sf.net > >> Hello all, > >> > >> I'm using 2.2b2, and seeing a very annoying effect: > >> > >> I visit a page, leave it for a while (visit some other pages, > >> wait...), and then come back and get a NullPointerException. This > >> isn't my error (though I may be causing it), since it's a null ENGINE! > >> In fact, I've subclassed BasePage and overridden attach(), in order to > >> determine what's going on, and it was never called. So in effect, I'm > >> operating on a page that hasn't been attached. How can this be? Has > >> anyone else seen this phenomenon? > >> Any pointers would be appreciated... > >> > >> -Jason > >> > >> > >> > >> > >> ------------------------------------------------------- > >> This SF.NET email is sponsored by: AMD - Your access to the experts on > >> Hammer Technology! Open Source & Linux Developers, register now for > >> the AMD Developer Symposium. Code: EX8664 > >> http://www.developwithamd.com/developerlab > >> _______________________________________________ > >> Tapestry-developer mailing list > >> [EMAIL PROTECTED] > >> https://lists.sourceforge.net/lists/listinfo/tapestry-developer > > > > > > ------------------------------------------------------- > > This SF.NET email is sponsored by: AMD - Your access to the experts on > > Hammer Technology! Open Source & Linux Developers, register now for the > > AMD Developer Symposium. Code: EX8664 > > http://www.developwithamd.com/developerlab > > _______________________________________________ > > Tapestry-developer mailing list > > [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/tapestry-developer > > > > > > ------------------------------------------------------- > This SF.NET email is sponsored by: AMD - Your access to the experts > on Hammer Technology! Open Source & Linux Developers, register now > for the AMD Developer Symposium. Code: EX8664 > http://www.developwithamd.com/developerlab > _______________________________________________ > Tapestry-developer mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/tapestry-developer > ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Tapestry-developer mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/tapestry-developer
