How To Kill Inactive Connections Automatically

i was gone through the below link

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so when i changed my idle_time value in profile and the when the user exceeds the idle_time value the user still i can see in-active state in v$session.

and when i was tried to execute any query on inactive session that time i got an ORA- error and then session was not visible from v$session.

in my environment inactive session was not getting used afterwards so is there any way to kill that sessions automatically once reached idle_timeout value.

lets say i have 50 max sessions, out of which 10 are inactive state and 40 in active state .what if i created one more sessions will that give me ORA- error stating max sessions reached or it will kill the one session which are in-active state.