How to use sql request with Jdev and database connection

Hello,
I have a login page with simple username and password inputsecret text and a button validate! I would like, when the user click on the validate button, to check in the database that the user and password matches. I've done the "Method BIndind..." with the commandButton_action and the database connection works fine.
How can I use an already existing procedure, say authenticate, wich is stored in the database to authenticate my user ?
Do I have to create a jdbc connection in java even if I've done the connection with the "create new database connection" wizard ?
String s1 = "jdbc:oracle:thin:@address:1521:ORCL";
System.out.println( "Connecting with: " );
System.out.println( s1 );
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
this.conn = DriverManager.getConnection( s1,"user","pass");
thanks for your help

Creating a connection to the DB in JDeveloper doesn't mean that your application is now connected to the DB - so yes you do need to create a connection to the database using JDBC.
One note - if you are trying to do a database user authentication the following is probably the better way to go about it:
http://www.oracle.com/technology/products/jdev/howtos/1013/oc4jjaas/oc4j_jaas_login_module.htm

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