That's a good one. I think it is good that the exception is thrown.
Trying to work with objects that don't exist anymore is wrong; so far so
good.
Problem with trying to solve this generic is that an exception thrown in
the model could have many causes. How would you like to be able to react
on such an error? Having something like onModelRuntimeException on your
components? That might sound convenient at first, but it doesn't handle
the cases where the model is accessed directly by clients. You could
decorate your models with model objects that catch the exceptions. But
that would mean a lot of code. Hmmm... do you have any ideas on how this
could be supported best?
Eelco
Phil Kulak wrote:
A user clicks on an edit link an gets a form containing a detachable
model. While the user is editing data on the form, the object they are
working on is deleted by another user. The current user submits the
form, which get it's model attached to contain a null object, and OGNL
throws a null pointer exception. Has anyone found an elegant solution
to this? Maybe model can throw an exception if it's object is null
that's caught somewhere to display a nice message to the user? Is
there one place in Wicket where I can catch all exceptions?
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