Скачать или смотреть Solving the 404 NOT FOUND Error When Updating a Table with @ Query in Spring

Learn how to effectively update a table using a custom @ Query in Spring while avoiding common pitfalls like the `404 NOT FOUND` error.
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This video is based on the question https://stackoverflow.com/q/64007633/ asked by the user 'RynohRR' ( https://stackoverflow.com/u/6413161/ ) and on the answer https://stackoverflow.com/a/64008104/ provided by the user 'RynohRR' ( https://stackoverflow.com/u/6413161/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When working with Spring and JPA, updating a database table using a custom query can sometimes lead to cryptic errors that halt your development. One common issue developers face is the dreaded 404 NOT FOUND error when trying to update records. If you've encountered this issue while trying to use the @ Query annotation, you are not alone. In this guide, we’ll explore this problem and provide a well-structured solution to ensure smooth functionality in your Spring application.

Understanding the Problem

You may have written a custom query in your Spring repository intending to update records in a table, but when the method is called, it results in a 404 NOT FOUND error. This can occur due to incorrectly mapped request URLs or issues with how the method parameters are being passed.

Here’s a quick recap of the code causing trouble:

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

And in your controller:

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

The use of path variables can be problematic if not properly referenced or if the URL does not match.

Solution Overview

To resolve the 404 NOT FOUND error and successfully update records in your table, we'll need to make a couple of adjustments in your controller and possibly in your repository interface. Let’s break down the solution into clear steps.

Step 1: Properly Define Your Controller Method

The first adjustment we can make involves how parameters are handled in the controller method. Instead of relying on path variables, we will change them to request parameters. This modification increases clarity and avoids mismatches between the URL and request mapping.

Updated Controller Method

Replace your existing method code like this:

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

Step 2: Add Transactional Support to Your Repository

To make sure that your updates are committed to the database, you should also annotate your repository interface with @ Transactional. This annotation ensures that the method is executed within a transaction context, which is particularly important for modifying database entries.

Example Repository Annotation

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

Conclusion

By implementing these changes in your Spring application, you should be able to successfully update the desired database records without running into the 404 NOT FOUND error. Simplifying how you handle parameters in your controller method and ensuring your repository is transactional can make all the difference in the operation of your application.

Troubleshooting issues like this is a common part of developing with Spring, but with the right adjustments, you can keep your application running smoothly. Happy coding!