JAAS authentication is an authentication framework that manages the authenticated user’s identity and credentials from login to logout. The process of verifying the identity of a user or another system is authentication. If login successful then call LoginContext.commit() else call CallbackHandler.java. The code snippet below declares an array of two callback objects which, when passed to the callback handler.java program, will be loaded with a username and password provided interactively by the user. If the login was successful, a subject was created.”]
Source: https://cheatsheetseries.owasp.org/cheatsheets/JAAS_Cheat_Sheet.html