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Your attachment document can store in database through the blob data type of databases. So by this you can store you documents in databases and then through jdbc connectivity you can retrieve the document from your database in j2ee means that the in application your j2ee.
If you want to keep URL unchanged means that the when the login is done then the URL is goto Home page. For this you can use the sendRedirect() function and pass the response object of the redirected URL.
The End.