Resolving the 404 Not Found Error in Your Spring Boot API Service

A step-by-step guide to fix the `404 Not Found` error in your Spring Boot application, particularly when accessing your employee API endpoint.
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Fixing the 404 Not Found Error in Your Spring Boot API Service

When working with Spring Boot to build a robust API, encountering errors can be a common hurdle. One such error that can leave developers puzzled is the 404 Not Found response. In this guide, we will delve into a specific instance of this error and provide clear guidance on how to resolve it effectively.

The Problem

[[See Video to Reveal this Text or Code Snippet]]

This situation is frustrating, especially when everything seems to be set up correctly. Let's explore where the issue lies and how you can fix it.

Investigating the Code

Upon reviewing the provided code snippets, the focus should be on the EmployeeMapper class, as this is where the mappings for the API endpoints are defined.

Current Code Analysis

The current setup for your EmployeeMapper is as follows:

[[See Video to Reveal this Text or Code Snippet]]

The Mistake

The issue arises from how annotations are structured in your EmployeeMapper class. The @ RequestMapping annotation is not correctly qualified, which is likely why Spring is unable to route the /all endpoint properly.

Correct Approach

To fix this issue, you need to adjust the annotations as follows:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Fix

@ RestController: This annotation is used without any attributes, which is the correct usage to mark the class as a REST controller.

Conclusion

By rearranging the @ RequestMapping and @ RestController annotations, you can resolve the 404 Not Found error and allow the API endpoint for retrieving employees to function correctly.

Following the corrective steps ensures clear and functional routing in your Spring Boot application, enabling seamless interaction with the API endpoints. If you continue to experience issues, consider examining other parts of your project setup or database connections, but often, it’s the little details that make a big difference!

Happy coding, and may your Spring Boot applications be ever bug-free!