How do you use Swagger UI to test Java web services with OpenAPI?

No cotidiano de desenvolvimento, é frequente encontrar tarefas relacionadas à integra??o de aplica??es externas no Liferay, uma plataforma em que trabalhamos. Por padr?o, essa ferramenta recorre ao Swagger para documenta??o das APIs disponíveis no portal. Isso nos permite, de forma eficiente, utilizar anota??es da biblioteca integrada ao Liferay para expor novos servi?os através da interface do Swagger, facilitando assim testes práticos e simplificando o processo.

Two dependencies are SpringFox & SpringDoc-OpenApi Open your project's pom.xml or build.gradle. Add the following dependency for Swagger: 1. SpringFox :- For Maven <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-boot-starter</artifactId> <version>3.0.0</version> </dependency> For Gradle implementation group: 'io.springfox', name: 'springfox-boot-starter', version: '3.0.0' 2. SpringDoc-OpenApi :- For Maven <dependency> <groupId>org.springdoc</groupId> <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId> <version>2.5.0</version> </dependency> For Gradle implementation group: 'org.springdoc', name: 'springdoc-openapi-starter-webmvc-ui', version: '2.5.0'

Integrating Swagger with your Java web services enhances API documentation and testing through the Swagger UI, facilitated by OpenAPI. For Maven, add Swagger Core for JAX-RS, Swagger Servlet Initializer, and Swagger UI dependencies in your pom.xml. Gradle users should include these dependencies in build.gradle, adjusting your_version accordingly. Further, configure Swagger to automatically scan and document web services, enabling Swagger UI via a specific URL for convenient testing. Launch your application and navigate to this URL to interact with and test your documented APIs effectively.

Define API Spec: Create an OpenAPI spec file (YAML/JSON) for your Java service. Add Swagger UI: Include Swagger UI in your project (via Maven/Gradle). Configure: Point Swagger UI to your OpenAPI spec file. Run: Start your application and access Swagger UI at https://localhost:8080/swagger-ui.html. Test: Use the Swagger UI interface to test your API endpoints.

Come on, check Baeldung, you have 2 keywords, Swagger and OpenAPI. You need to know that we have OpenApi v2 and v3 We have swagger and swagger v2, And with dependencies, you can do it with 1 bundle or add 1 by 1. Check for more problem when you only add the document but now the UI.

Do your project like normal and I remember to check @Controller or @RestController, some old bug that api won't show up. Other than that, You can add more information for swagger with the comment.

To test Java web services with OpenAPI using Swagger UI, annotating your services is crucial. Use @OpenAPIDefinition at the class level for global API details like title and version. Specify endpoint URLs with @Path and detail operations (GET, POST, PUT, DELETE) using @Operation for summaries. For parameters, use @QueryParam and @PathParam for URL-passed values and @RequestBody for POST and PUT request bodies. Document responses with @ApiResponse, and specify consumable and producible media types with @Produces and @Consumes. Enhance this process with Swagger UI for interactive documentation, IDE plugins for easier annotation, and tools like Swagger Editor for validation, ensuring your API meets OpenAPI standards.

Annotations like @OpenAPIDefinition provide general information about the API, while @Operation, @Parameter, and others offer detailed insights into each web service. These annotations not only guide Swagger in generating accurate OpenAPI documentation but also serve as a valuable reference for developers accessing your API.

Swagger Ui provides us documentation as well as support for testing the documented api's. We can first authenticate our request and then test our Api's. We just need to add some annotations to document metadata about the APi's @Api is a class level annotation used to specify description @ApiResponse is an annotation which documents our various responses and statuses to verify @ApiParam specifies the parameters used in api

Use OpenAPI annotations (e.g., @Api, @ApiOperation) in your REST controllers. These annotations describe your endpoints, request parameters, and response types, generating a clear API documentation.

You can personalize the look and feel of Swagger UI to better suit your needs. This is entirely optional, but it can provide a more tailored experience for users interacting with your API documentation. If you're interested in customization, explore creating a class implementing the OpenApiConfiguration interface. This class allows you to configure various aspects like: Base path Filtering specific API elements Defining how models are converted Adjusting the UI layout and theme Remember, customization is optional, and the default settings often work well for basic use cases.

Create a configuration class to set up Swagger. This includes defining the API information, such as title and version, and specifying the base package to scan for annotated classes.

Configuring Swagger involves creating a class that implements OpenApiConfiguration and customizing settings such as base path, model converters, and UI configurations. This customization tailors Swagger UI's appearance and behavior to match specific project requirements.

Check that your Swagger setup is properly set up in your Spring Boot application enabling Swagger (@EnableSwagger2) and setting a Docket bean to specify API documentation information. Default URL is https://<your-domain>/swagger-ui.html. Swagger UI provides a comprehensive list of your API endpoints. You can interact with these endpoints directly from the interface. No network limitations hinder access to the Swagger UI URL. Consider establishing security mechanisms, particularly in a Prod. env., to limit access to the Swagger UI and API documentation endpoints. You can use Spring Security or other authentication systems for this reason. Additionally, your API documentation is available in JSON format at https://<your-domain>/v2/api-docs.

To deploy Java web services for Swagger UI testing with OpenAPI, follow these steps: Package your project into a WAR file using Maven or Gradle for JAX-RS compatible server deployment. Choose traditional servers like Tomcat for full JAX-RS support or integrated servers like Grizzly for a lightweight setup. For traditional servers, place the WAR file in the deployment directory; for integrated servers, configure them to initiate Swagger and your services. Access Swagger UI through your app's URL, usually at https://localhost:8080/your-app/swagger-ui.html, for interactive API documentation. Ensure Swagger is properly set up, secure the UI in production to block unauthorized access, and use Swagger UI for thorough testing and validation.

Deploy your Java web services on a server (like Tomcat) or a cloud platform. Ensure the application is accessible for Swagger UI to fetch the API documentation.

Deploying your Java web services involves packaging them into a WAR file and deploying them on servers like Tomcat or Jetty. This step makes your services accessible, allowing Swagger UI to interactively document and test endpoints via standard HTTP requests.

We faced the problem when the default link of swagger chance by versions... But it's okay we can overwrite it with our logic. just the UI url change, the v2 doc stay the same so you still can feed it to other UI support.

SpringDoc-OpenApi :- Open your project's pom.xml or build.gradle. Add the following dependency for Swagger: For Maven <dependency> <groupId>org.springdoc</groupId> <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId> <version>2.5.0</version> </dependency> For Gradle implementation group: 'org.springdoc', name: 'springdoc-openapi-starter-webmvc-ui', version: '2.5.0' Add a custom springdoc field to your spring-boot configuration file to specify a custom path for the swagger documentation in HTML format: # swagger-ui custom path springdoc.swagger-ui.path=/swagger.html

Once you've deployed your Java web services, access Swagger UI to explore and test API endpoints in real-time via https://localhost:8080/swagger-ui.html. For example, imagine you've built a RESTful service for a Student Management System using Spring Boot, with endpoints like /students (GET), /students (POST), and /students/{id} (DELETE). After configuring Swagger, navigate to the Swagger UI page to see the listed endpoints. To test the /students endpoint: Go to /students. Click Try it out. Click Execute to send the API call. Swagger UI will return a response, such as: json Copy code [ {"id": 1, "name": "John Doe", "age": 22}, {"id": 2, "name": "Jane Smith", "age": 21} ]

To integrate Swagger UI with Java web services, start by adding Swagger dependencies ('org.springdoc:springdoc-openapi-ui') to your Maven or Gradle project. Annotate your controllers and methods using Swagger annotations like '@OpenAPIDefinition' and '@ApiOperation' for detailed documentation. Set up Swagger with a configuration class in your project, deploy the application, and access the Swagger UI through the URL (e.g., 'https://localhost:8080/swagger-ui.html'). Use the UI to send requests and test your API endpoints directly.

Open your browser and navigate to the Swagger UI endpoint (usually /swagger-ui.html). This interactive interface displays your API documentation in a user-friendly format.

Once your application is running, navigate to https://localhost:8080/swagger-ui.html (assuming it is listening on port 8080). This URL opens an interactive documentation portal, allowing you to browse, test, and view documentation for your API endpoints. provides an interactive documentation interface where you can explore your API endpoints, test them, and view their documentation.

Testing your web services with Swagger UI involves using its 'Try it out' feature to input parameters, headers, and bodies directly within the interface. This interactive testing capability verifies API functionality and ensures that endpoints behave as expected under various conditions.

Testing your web services with Swagger UI is easy. Go to the Swagger UI page where your API details are shown. Next to each operation, you’ll see a "Try it out" button. Click this button to test your API. You can enter the input, headers, and body for your request right on the page. After you submit it, you’ll see the response status, headers, and body displayed below. Swagger UI also gives you a "curl" command for each request. You can use this command to test your API from the command line or other tools.

I will give you an idea of what we did. Swagger UI and OpenAPI gave you the data of how your API was defined and all related information. You can load this information and create an auto-test for those lists of APIs based on your logic. Like if they ask to create a user with many fields with the type of number, string, boolean, or any other. You can make a combination out of all these fields and call this API. After some trials, your coverage for the test will skyrocket. Image what you can do with those information

To test Java web services with OpenAPI using Swagger UI, generate the OpenAPI Specification, integrate Swagger UI into your project, and access it to explore, test, and document API endpoints interactively. Submit test requests within the Swagger UI interface to validate the behavior of your Java web service, enhancing the testing and