Invalidating session in servlet
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(Such a class is provided by the OC4J servlet container.) When a servlet creates an HTTP session object, the client interaction is considered to be stateful.
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Provides a way to identify a user across more than one page request or visit to a Web site and to store information about that user.
This cookie is used to identify the Http Session object in further requests from client.
If the cookies are disabled at client side and we are using URL rewriting then this method uses the jsessionid value from the request URL to find the corresponding session.