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KumuluzEE Swagger extension provides powerful tools to incorporate and visualize the Swagger (OpenAPI 2.0) specification to your microservice.

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KumuluzEE Swagger

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KumuluzEE Swagger project provides powerful tools to incorporate and visualize the Swagger (OpenAPI 2.0) specification to your microservice.

KumuluzEE Swagger (OpenAPI 2.0) project provides support for documenting APIs using Swagger/OpenAPI v2 compliant annotations. Project automatically hooks-up servlet that exposes API specification on endpoint /api-specs/<jax-rs application-base-path>/swagger.[json|yaml]. Project also provides SwaggerUI which is added to your project to visualize API documentation and allow API consumers to interact with API endpoints.

More details: Swagger Specification.

Usage

You can enable the KumuluzEE Swagger support by adding the following dependency:

<dependency>
    <groupId>com.kumuluz.ee.swagger</groupId>
    <artifactId>kumuluzee-swagger</artifactId>
    <version>${kumuluzee-swagger.version}</version>
</dependency>

Swagger configuration

When kumuluzee-swagger dependency is included in the project, you can start documenting your REST API using Swagger-Core Annotations.

Documenting application class

@SwaggerDefinition(info = @Info(title = "CustomersAPI", version = "v1.0.0"), host = "localhost:8080")
@ApplicationPath("v1")
public class CustomerApplication extends Application { ... }

Documenting resource class and operations

@Path("customers")
@Api
@Produces(MediaType.APPLICATION_JSON)
public class CustomerResource {

    @GET
    @ApiOperation(value = "Get customers list", tags = {"customers"}, notes = "Returns a list of customers.",
            authorizations = {
                    @Authorization(value = "application")})
    @ApiResponses(value = {
            @ApiResponse(
                    message = "List of customers",
                    code = 200,
                    response = Customer.class,
                    responseContainer = "List")
    })
    public Response getCustomers() {

        List<Customer> customers = new ArrayList<>();
        Customer c = new Customer("1", "John", "Doe");

        customers.add(c);

        return Response.status(Response.Status.OK).entity(customers).build();
    }
}

Accessing API specification

Build and run project using:

mvn clean package
java -jar target/${project.build.finalName}.jar

After startup API specification will be available at:

http://<-hostname-:<-port->/api-specs/<-application-base-path->/swagger.[json,yaml]

Example:

http://localhost:8080/api-specs/v1/swagger.json

Serving Swagger specification can be disabled by setting property kumuluzee.swagger.spec.enabled to false. By default serving API spec is enabled.

Adding Swagger-UI

To serve API specification in visual form and to allow API consumers to interact with API resources you can add Swagger-UI by including dependency kumuluzee-swagger-ui:

<dependency>
    <groupId>com.kumuluz.ee.swagger</groupId>
    <artifactId>kumuluzee-swagger-ui</artifactId>
    <version>${kumuluzee-swagger.version}</version>
</dependency>

Dependency will include SwaggerUI artifacts, in case you want to temporarily disable UI you can set configuration property kumuluzee.swagger.ui.enabled to false:

kumuluzee:
  swagger:
    ui:
      enabled: false

After the startup Swagger-UI is available at: http://localhost:8080/api-specs/ui.

If you want to completely disable swagger extension you can set the following property kumuluzee.swagger.enabled to false:

kumuluzee:
  swagger:
    enabled: false

Changing hostname and base path

Hostname and base path can be overridden in swagger.[json,yaml] by setting config parameter kumuluzee.swagger.base-url. This will generate API definition with the address that needs to be known to the client consuming the API. It also solves the problems when API is running behind reverse-proxy or API Gateway (that modify the URL of the API).

kumuluzee:
  swagger:
    base-url: http://microservice.kumuluz.com/customers-service/

If kumuluzee.swagger.base-url is not set the kumuluzee.server.base-url is used as a source setting for the API URL location. If neither is set the "http://localhost:8080" is used.

Changelog

Recent changes can be viewed on Github on the Releases Page

Contribute

See the contributing docs

When submitting an issue, please follow the guidelines.

When submitting a bugfix, write a test that exposes the bug and fails before applying your fix. Submit the test alongside the fix.

When submitting a new feature, add tests that cover the feature.

License

MIT

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KumuluzEE Swagger extension provides powerful tools to incorporate and visualize the Swagger (OpenAPI 2.0) specification to your microservice.

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