0Pricing
Spring Security 6 & JWT Authentication · Lesson

Handling Authentication Errors and Entry Points

Customize how your JWT-secured Spring app responds to missing, invalid, or expired tokens using AuthenticationEntryPoint and AccessDeniedHandler.

Two Kinds of Security Failure

Spring Security distinguishes two failures:

  • Authentication failure (401): the user is not identified — missing or bad token
  • Authorization failure (403): the user is known but lacks permission

Each is handled by a different component.

The Default Behavior

Out of the box, a JWT app without a custom handler may redirect to a login page or return an HTML error. For a stateless API you usually want a clean JSON 401 instead.

All lessons in this course

  1. Designing the JWT Authentication Flow
  2. Implementing a Custom JWT Filter
  3. AuthenticationManager and Provider Integration
  4. Handling Authentication Errors and Entry Points
← Back to Spring Security 6 & JWT Authentication