intermediateCustom AuthenticationProvider & Exception Handling
When would you write a custom AuthenticationProvider instead of relying on DaoAuthenticationProvider?
When your authentication logic doesn't fit the standard 'fetch UserDetails, compare hashed password' pattern — for example, OTP-based login, verifying against an external legacy identity system, or layering extra business rules (like blocking login during a maintenance window) into the authentication decision itself.
Ready to master this question?
Generate a complete walkthrough — background, the full answer in plain language, a working code example explained line by line, a real-world scenario, common mistakes, and how this same question gets asked in different ways.
Sign in to generate a response