hook up the database in controllers
exception handle controller
spring security filter
Fix 404 error
login controller and custom login page
login failure and error message
users login from database
add user registeration form
create user account and store in database
user validation and error message
check if username already exists
error message properties
check with js if passwords are match
error messages properties with fmt:message tag
log out page
authentication status and conditional text (admin)
show all users in admin page
custom query login (username case-insensitive )
Change authority from admin to ROLE_ADMIN
method secure level (restrict access method)