Answer Posted / sunny

first,u have to use sendRedirect in form of JSP browserside.
<form method="POST"
action="/SendRedirect/SendRedirectServlet">

second in SendRedirectServlet, u have giving a response to
browser side
response.sendRedirect("/SendRedirect/ValidUserServlet");

it makes a request to one resource in server.
in server, gives response to browser. session is lost at a
time.

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