saving a interface in session

[Alfonso Quiroga <al...@gmail.com>]

Hi! I want to ask something, maybe someone did this and can answer me.
I have the "Wizard" interface, and 2 o 3 implementations. As I want to
store in session only one of them in a specific moment (user can't use
2 wizards in the same time), I would like to store the interface, say:

    @SessionState
    private Wizard currentWizard;

My question maybe is performance, I mean, when WizardImpl1 is in
session, then I change it to WizardImpl2.. talking about session size,
Impl1 will disapear by the GC? or both impl will be in the session?
thanks in advance, and sorry for my english

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