Error handling is part of an API contract. When every endpoint returns a different error format, clients need special logic for each failure. Spring Boot can provide one predictable structure for validation, missing resources, conflicts, and unexpected errors. Create domain-specific exceptions Use meaningful exceptions such as ResourceNotFoundException, ReservationConflictException, or AccessDeniedException. These names describe the business…
Tag: Spring Boot
Preventing Double Booking in a Reservation System
Double booking is one of the most important problems in any reservation system. Two users may see the same seat as available and submit their requests almost at the same time. A simple availability check is not enough when requests run concurrently. Why the basic check fails Imagine that request A checks seat 12 and…
How to Structure a Clean Spring Boot REST API
A Spring Boot REST API can become difficult to maintain when controllers, business rules, and database operations are mixed together. A simple layered structure keeps the code easier to test, extend, and understand. Start with clear responsibilities The controller should handle HTTP concerns: reading the request, validating input, selecting the correct status code, and returning…