Hi,
I'm having a little trouble getting my head around the Visit object and when
it's instantiated. Based on what I've read in the documentation, tapestry
is designed to delay session creation until the object is absolutely needed.
This occurs when you make your first call to IPage.getVisit(), correct?
The problem I'm having is a bit puzzling. I had every thing working fine,
until I tried to remove some redundant code. Originally, I had some
ActionLinks on a border component that interacted with the visit object,
then in turn did a fetch to the db and set a list on a browse page.
Something like:
public void viewMyObjects(IRequestCycle cycle) {
BrowsePage nextPage =
(BrowsePage) cycle.getPage("BrowsePage");
Visit visit = (Visit) this.getPage().getVisit();
DataContext ctxt = visit.getDataContext();
.....
List objects = ctxt.performQuery(query);
nextPage.setList(objects);
cycle.setPage(nextPage);
}
Instead of building this list in this action method and setting it on the
following browse page, I decided to make the BrowsePage responsible for
painting itself. This is where I run into trouble.
I've changed the ActionLink to a 'regular' PageLink in the border component.
I also removed action method from my border component and added the guts of
the method to the BrowsePage's constructor.
An NullPointerException
(net.sf.tapestry.AbstractPage.getVisit(AbstractPage.java:380)) is thrown in
the page's constructor when I call:
Visit visit = (Visit) this.getPage().getVisit();
Any ideas?
Thanks in advance,
Eric
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