Login page user name and password for Oracle Database

Hi,
I created a login.jsp page with username,password and a submit button. How can I validate this username and password from my Oracle database username and password?
I am using NetBeans5.5 with Tomcat5.5.17. Right now I have hardcoded username and password in my persistence.xml.
Anyhelp?

Thnx BalusC for ur reply. Let me explain my issue.
I have created a login page. and user is able to enter user name and passowrd on this page. User is supposed to press a 'submit' button when user enters username and password to connect to database. What should I write in 'submit' button's action to let user allow to proceed if username and password are correct i.e. username and password of my oracle database. (usename=scott and passowrd=tiger).
plz help.

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