<Realm className="JDBCRealm/CouponSystem"
      driverName="com.mysql.jdbc.Driver"
      connectionURL="jdbc:mysql://localhost:3030/coupon_system?user=someuser;password=somepassword"
      userTable="user" userNameCol="nickname" userCredCol="password"
      userRoleTable="user_roles" roleNameCol="Administrator" roleNameCol="Customer" roleNameCol="Company"/>