This works fine:
I open the session,
initialize the GUI with the data from the DB and then
I close the session - as shown in the examples.


But when I activate lazy-loading the following happens:
The initialization of the GUI as described above works and no errors are shown.
But when I access some child-objects which should get loaded lazy I get the 'LazyInitializationException'.

Will I need to have an opened session during the whole application-lifetime? Or is there another way to use lazy-loading?

Hi,

You will have to initialize the child in the same session, else you will have the LazyInitializationException.

i.e)
If you want the child in the screen1, load the child along with the parent.

If you feel that in page1 parent object is enough and in page2 you are required to show child object..call ur backend to load the parent with child.

Hope this helps:-)