When you want to implement your own login mechanism for your application, you may want to use JAAS and implement the required programmatic login.
Figure 8-8 shows the activity diagram for JAAS and how the different components are working together during a login process.
The step-by-step process is described below:
The application starts the login process using JAAS.
The LoginContext is initialized.
During the login process, executed in the LoginContext, a Principal will be authenticated using the specified callback handler.
If the authentication was successful the LoginContext commits ...