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is there any isNew() method in jsp??whats its use??

 
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does isNew() method prevent a user from entering the site directly without entering the username and his password??
i need a code for this program??
if a user enter a site without authenticating..
he or she should be redirected to the Authentication page??
how can this be done in jsp??
Its very urgent...
 
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consider to use sessions.
you can also play with tags in the web.xml file:
http://developer.java.sun.com/developer/Books/javaserverpages/servlets_javaserver/servlets_javaserver05.pdf
 
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