My .jsp does not call the ActionForm servlet :-(

Hello,

I have a .jsp that when opening, I feel should call the ActionForm
(holding "getters" and "setters"). But this is not going on. Is there
some place I can look to see what the problem is?

What exactly is one supposed to do so that when running a .jsp file,
the class (based on the ActionForm) will be called?

Kindest Regards.