Invalid token exceptionn

[Cry199]

This pull request improves error handling and robustness in the authentication and token validation process. The main changes include more granular exception handling for JWT token errors and centralized exception resolution in the security filter.

Authentication and Exception Handling Improvements:

• The SecurityFilter now uses a HandlerExceptionResolver to handle exceptions during authentication, ensuring that errors are processed in a centralized and consistent way.
• The filter throws a UsernameNotFoundException with a clear message when a user is not found by ID, improving error clarity.

Token Validation Enhancements:

• The TokenService now logs errors and distinguishes between different JWT-related exceptions, throwing specific messages for expired, malformed, unsupported, invalid signature, or empty tokens. This provides more informative feedback for each token validation failure scenario. [1] [2] [3]