Spring Boot Exercises

Introduction

Hands-on exercises to cement what you've learned. Pick one, build it end-to-end, push to GitHub, deploy somewhere.

Understanding the topic

Pick your battle:

• 🟢 URL shortener — POST a long URL, get a short slug; redirect on GET.
• 🟢 Notes API — CRUD with auth and per-user isolation.
• 🟡 Polls service — create polls, vote once per user, live results via WebSocket.
• 🟡 Inventory tracker — products, stock movements, low-stock alerts via email.
• 🔴 Payment-like ledger — accounts, transfers, transactional double-entry.
• 🔴 Multi-tenant SaaS — orgs, users, roles, per-tenant rate limits.