Accessing functions from JSP code

Hi..
I am trying to access functions from the jsp code, using the following
code. I  get error and just cant access the function. Dont know what to do??
Please help...

    sql="execute sp_login 'INSERT','admin','"+username+"','"+password+"'";
    pStat=conn.prepareStatement(sql);
    msg=pStat.executeUpdate();

Minal