Form authentication with tomcat (AES) - forms-authentication

1.I am having a web app in which a user can register by providing new user id and password and i am encrypting the password using AES and storing it in my postgres database
For user welcome page I want to use form based authentication using tomcat
But for that i first need the user to login in my login page then i decrpyt the password in my database and check it with the user entering password
But from my understanding so far about tomcat authentication i need to use password="j_password" for password validation
but my database contains only encrypted password so hope you get my question
please help!! Thanks in advance.....

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