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Learn how to effectively document your Spring Data REST API using OpenAPI 3 with Spring Boot and swagger-ui. Follow our clear steps to configure and enhance your API documentation.
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Documenting Your Spring Data REST API with OpenAPI 3 in Spring Boot

Are you struggling to document your Spring Data REST API using OpenAPI? You're not alone. Many developers face challenges when trying to integrate OpenAPI documentation with their Spring Data REST APIs. In this guide, we will walk you through the solution to effectively document your API, ensuring that it appears correctly in the swagger-ui interface.

The Challenge

The issue often arises when developers notice that their API documentation is not visible in the swagger-ui homepage, as well as the /v3/api-docs endpoint. This can be frustrating, especially when you have set up everything correctly. The good news is that there is a straightforward way to resolve this issue.

Step-by-Step Solution

To get your Spring Data REST API documented with OpenAPI 3, follow the steps outlined below.

1. Confirm Your Dependencies

It’s crucial to ensure that you have included the necessary dependencies in your pom.xml file. Here’s a quick check on what you should have:

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Ensure that the versions are compatible and up-to-date.

2. Check the Swagger-UI Link

To access your application's API documentation, use the following URL in your browser:

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If everything is set up correctly, the swagger-ui should display your available API endpoints.

3. Define Your OpenAPI Configuration

Next, you need to create an OpenAPI Bean to customize your API documentation further. You can do this by adding the following code in one of your configuration classes:

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4. Annotate Your REST Controller

For better clarity and to enrich your documentation, add descriptive annotations above your API methods. Here’s an example:

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Make sure to import relevant classes from the io.swagger.v3.oas.annotations package to utilize these annotations effectively.

5. Review Your Configuration Properties

You should also verify your application.properties or application.yml to ensure necessary configurations are in place. Here’s a simple sample:

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Conclusion

By following the outlined steps, you should be able to confidently document your Spring Data REST API using OpenAPI 3 and have it show up properly in swagger-ui. With the right dependencies, configurations, and annotations, you can provide clear and detailed API documentation that enhances the understanding of your API for consumers.

If you encounter any further issues or have questions, feel free to seek assistance or explore additional resources related to Spring Boot, Spring Data REST, and OpenAPI.

Happy coding!