redirect works, forward won't work.

But of course the HTTP session does NOT get shared.
And quite possibly you'll need to make sure you're working with POST requests so and change the request parameters to request attributes.

Remember that nothing except what ends up in the http request gets send across.

Forward won't work given that the requested servlet is looked for in the given ServletContext. sendRedirect doesn't preserve the original request since it's a new request altogether which the client is making -- sendRedirect is basically an indication to the client to request for the given URI.

why don't you sessions then if really want to use send.redirect option otherwise you can use form action method in using html that work fine with jsp

idiot. Sessions do NOT get shared between applications.