Spring Boot Whitelabel Error Page (type=Not Found, status=404) – Troubleshooting Guide

Error Overview

The “Spring Boot Whitelabel Error page (type=Not Found, status=404)” indicates that the requested resource could not be found on the server. This error often arises in Spring Boot applications when the server is unable to locate a specific endpoint, file, or asset. The Whitelabel Error page is a default error page provided by Spring Boot, which shows limited information about the error. This guide will help you understand common causes and offer effective solutions for this error.

Common Causes

Several factors can lead to the occurrence of the “Spring Boot Whitelabel Error page (type=Not Found, status=404)”:

1. Incorrect URL: The most common reason for this error is an incorrectly typed URL.
2. Missing Controller: If there is no controller mapped to the requested URL, Spring Boot will return a 404 error.
3. Static Resource Not Found: Static resources such as HTML, CSS, or JavaScript files may not be located in the correct directory.
4. Application Not Running: If the Spring Boot application is not up and running, any request will result in a 404 error.
5. Path Variable Issues: Incorrect or missing path variables in the URL can also lead to this error.

Solution Methods

To resolve the “Spring Boot Whitelabel Error page (type=Not Found, status=404)”, follow the methods outlined below.

Method 1: Verify the URL

1. Double-check the URL in the browser.
2. Ensure that the URL matches exactly with the expected endpoint.
3. Confirm that the correct HTTP method (GET, POST, etc.) is being used.

Method 2: Check Controller Mappings

1. Open your Spring Boot application source code.
2. Navigate to the controller classes and verify that the appropriate mappings exist.
3. Ensure that the method handling the request is annotated with @GetMapping, @PostMapping, etc.
4. For example, the following code snippet shows a simple controller mapping:

“`java
@RestController
public class MyController