what is session expunging?was asked this question in an interview?

[senthil sen]

how would we avoid session from being expunged?
i was asked this question in an interview?

[Dominic Paquette]

I know 2 ways:
in code
session.setMaxInactiveInterval(-1);
or in the web.xml
<sesssion-config>
<session-timeout>-1</session-timeout>
</session-config>

Dominic

[senthil sen]

thanks for ur reply,but i wanna to know the theory and logic of the concept session expunged??that word is new to me.,,

[Dominic Paquette]

I think expunging a session means invalidating a session. Either it timesout or you can explicitlly invalidate it using HttpSession.invalidate();
Hope this helps
Dominic