Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 105
Authentication Challenges
Authentication is where mistakes are public and expensive.
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Focus
2 guided sections
Practice signal
Concept-first lesson
Career prep
Foundation builder
Introduction
Authentication is where mistakes are public and expensive. Build these to internalise the patterns.
Understanding the topic
- Implement signup + login + email verification + password reset (JWT or session).
- Add refresh-token rotation with reuse detection.
- Add 2FA via TOTP (Google Authenticator).
- Add Sign in with Google via OAuth2/OIDC.
- Add device sessions — list, revoke individual sessions.
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