Click here to see a very basic login application with hard-coded user credentials. In current article I am discussing as on how to validate from a table where login id and password is stored. The article above points to the usage of flash and session's uses. I will not discuss more about flash and session in this article.
My assumption is that a person is assigned for a login with his email id. Based on that I planned for a domain called "Person" as below (I named the application happy):
package happy
class Person {
String firstName
String lastName
String emailID
...
