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Unlock the Power of OpenAPI Generator

Introduction
Open API Generator
Choosing a Generator
Using Open API Generator
Configuring the Generator
Generating the Code
Implementing the Endpoints
Integrating with Maven
Ignoring Generated Classes
Conclusion

🌟 Introduction

In this article, we will explore cloud-native application development and specifically focus on the Open API Generator. We will discuss how to use the Open API Generator to generate code for a Spring Boot application that serves as an API. By following the steps, you will be able to create a working server application using the contract-first development approach.

🌟 Open API Generator

The Open API Generator is a tool that allows you to generate code based on an Open API Specification (OAS). It provides a comprehensive list of generators for different frameworks and languages. For our purposes, we will be using the Spring generator to create a Spring Boot server application.

🌟 Choosing a Generator

To use the Open API Generator, we first need to select the appropriate generator. The Open API Generator website provides a list of client and server generators. Since we are creating a Spring Boot server application, we will choose the Spring generator.

🌟 Using Open API Generator

Once we have chosen the generator, we need to configure it before generating the code. The Open API Generator website provides detailed information about each generator, including configuration options. It is recommended to spend some time familiarizing yourself with the configuration options before proceeding.

🌟 Configuring the Generator

To configure the generator, we need to specify the input file, Artifact information, base Package information, and more. The Open API Generator allows you to customize the mappings from the OAS types to language-specific types. It is important to understand these configuration options and make the necessary adjustments for your application.

🌟 Generating the Code

To generate the code, we will use the openapi-generator generate command, specifying the Spring generator and the input file. The Open API Generator will output the generated code in the specified source folder. By default, the code is stored in the source/main/java folder, but we will store it in the source/main/gen folder to separate it from the manually written code.

🌟 Implementing the Endpoints

Once the code is generated, we can start implementing the endpoints. The Open API Generator creates interface files with Swagger annotations for each endpoint defined in the OAS. We need to provide the implementation for these interfaces in our Spring Boot application. By following the generated code, we can easily stub out the methods and return the desired response.

🌟 Integrating with Maven

To integrate the code generation into our build process, we will use the Open API Generator Maven plugin. This plugin allows us to automatically regenerate the code during the build process. By adding the plugin configuration to our pom.xml file, we can seamlessly generate the code each time we build the project.

🌟 Ignoring Generated Classes

To ensure that the Open API Generator does not regenerate certain files, we can use the ignore file feature. By adding the appropriate rules to the .openapi-generator-ignore file, we can specify which files should be excluded from regeneration. This allows us to have more control over our generated code and prevent accidental overwrites of manually modified files.

🌟 Conclusion

In conclusion, the Open API Generator is a powerful tool for generating code based on an Open API Specification. By following the steps outlined in this article, you can easily create a Spring Boot server application using the contract-first development approach. The integration with Maven and the ability to ignore generated classes provide flexibility and control over the code generation process.

🌟 Highlights

Open API Generator is a tool for generating code based on an Open API Specification.
The Spring generator can be used to create a Spring Boot server application.
Configuration options allow customization of mappings and other settings.
Generated code includes interface files with Swagger annotations for each endpoint.
Integration with Maven enables automatic code generation during the build process.
The ignore file feature allows exclusion of specific files from regeneration.

🌟 FAQ

Q: Can I use the Open API Generator with other frameworks? A: Yes, the Open API Generator provides generators for various frameworks and languages, allowing you to choose the one that best fits your needs.

Q: Can I modify the generated code? A: While it is possible to modify the generated code, it is recommended to treat it as immutable and make changes in the manually written code instead.

Q: How do I ensure that the generated code adheres to the Open API Specification? A: The Open API Generator generates code based on the provided OAS file, ensuring that the endpoints and responses match the specification. Additionally, schema validation tools can be used to validate the API compliance.

Q: Can I integrate the Open API Generator with other build tools? A: Yes, the Open API Generator provides integrations with various build tools, including Gradle, CI/CD systems, and more.