Ok a Custom CachingActivityMapper was easy to implement and works but
there is still a case I am not happy with. If a user bookmarks
EmployeePlace(1,123) and 123 gets deleted the activity would redirect to
EmployeePlace(1, null) to keep the URL in sync (activity can not preselect
the deleted
Because you activity lasts longer than a place, it should listen to
PlaceChangeEvent (as if it were a singleton, except that it can be garbage
collected and will be recreated if you go to another activity in the mean
time), or the ActivityMapper should update it with the new place.
But
Yeah its a migration to activities and for simplicity I have only defined a
single display area. Thats somehow the work area of the app.
The reason is that I have a custom widget (layout panel) that can do quite a
lot of things. So for each place I have that custom widget that effectively
