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spring boot error exception handling - session 3 by mr. raghu

in this session, we will explore error and exception handling in a spring boot application. proper error handling is crucial for creating robust applications, as it allows developers to manage unexpected situations gracefully and provides a better user experience.

key concepts

1. **exception handling**: mechanism to handle runtime errors in a controlled way.
2. **controller advice**: a specialization of the `@component` annotation that allows you to handle exceptions globally across all controllers.
3. **responseentity**: a helpful class that represents an http response, including status codes and response body.
4. **custom exception**: user-defined exception classes that can provide specific error messages.

step-by-step tutorial

step 1: create a spring boot application

you can create a new spring boot application using spring initializr (https://start.spring.io/) with the following dependencies:
spring web
spring boot devtools (optional for development)

step 2: define a custom exception

create a custom exception class that extends `runtimeexception`.



step 3: create a controller

next, we will create a simple rest controller that might throw our custom exception.



step 4: create a global exception handler

use `@controlleradvice` to create a global exception handler that will catch exceptions thrown by the controllers and return appropriate responses.



step 5: testing the application

run your spring boot application and test the endpoint using a tool like postman or curl.

accessing `/users/1` will return:


accessing `/users/2` will return:


summary

in this session, we learned how to handle exceptions in a spring boot application. we created a custom exception, built a rest controller that can throw that exception, and implemented a global exception handler using `@controlleradvice`. this approach provides a centralized way to handle exceptions and return meaningful ...

#SpringBoot #ExceptionHandling #MrRaghu

Spring Boot
error handling
exception handling
session 3
Mr. Raghu
REST API
global exception handler
@ControllerAdvice
@ExceptionHandler
error response
custom exceptions
logging errors
best practices
error codes
troubleshooting