Handle Exceptions in Spring Boot: A Guide to Clean Code Principles

source: dineshonjava.com

Exception handling is a key part of writing good code in Spring Boot applications. When things go wrong in your application, proper exception handling helps you manage errors in a clean and organized way. In this guide, we’ll learn how to handle exceptions effectively in Spring Boot using simple and clean approaches.

Why is Exception Handling Important?

Think of exception handling like having a safety net when walking on a tightrope. If something goes wrong, the safety net catches you. Similarly, when errors happen in your code, good exception handling:

• Prevents your application from crashing
• Gives users helpful error messages
• Makes debugging easier
• Keeps your code organized

Basic Exception Handling in Spring Boot

Let’s start with the basics. Spring Boot gives us several ways to handle exceptions. Here’s the simplest way using @ExceptionHandler:

@RestController
public class UserController {
    
    @GetMapping("/users/{id}")
    public User getUser(@PathVariable Long id) {
        // This could throw a UserNotFoundException
        return userService.findUser(id);
    }…