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HFSJ Mock Exam

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I was going through HFSJ 1st edition Q15.

Q:- Once a session has been invalidated, which HttpSession methods can be called on that session without throwing illegalState Exception?

Options -

A: invalidate
B: getAttribute
C: setAttribute
D: getServletContext
E: getAttributeNames

Answer: - Since the servletContext survives, getServletContext can be called successfully on an invalid session.

I am not so clear why? if an object is invalid and why getServletContext servives. Trying to access this should give null pinter exception or illegalStateException.

Please clarufy this doubt
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When you call invalidate()
The session ID no longer exists.
The attributes are removed from the session object.

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