KumuluzEE OpenAPI extension provides powerful tools to incorporate and visualize the OpenAPI 3 specification to your microservice.
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KumuluzEE OpenAPI

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KumuluzEE OpenAPI project provides powerful tools to incorporate and visualize the OpenAPI 3 specification to your microservice.

KumuluzEE OpenAPI project allows you to document microservice APIs using OpenAPI v3 compliant annotations. Project will automatically hook-up servlet that will serve your API specifications on endpoint /api-specs/<jax-rs application-base-path>/openapi.[json|yaml]. Furthermore, project allows you to integrate Swagger-UI into your microservice that will visualize APIs documentation and allow you to interact with your API resources.

More details: OpenAPI v3 Specification.


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


OpenAPI configuration

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

Documenting application class

@SecurityScheme(name = "openid-connect", type = SecuritySchemeType.OPENIDCONNECT, 
                openIdConnectUrl = "http://auth-server-url/.well-known/openid-configuration")
@OpenAPIDefinition(info = @Info(title = "Rest API", version = "v1", contact = @Contact(), license = @License(), description = "JavaSI API for managing conference."), security = @SecurityRequirement(name = "openid-connect"), servers = @Server(url ="http://localhost:8080/v1"))
public class JavaSiApplication extends Application {...}

Documenting resource class and operations

public class SessionsResource {

    @Operation(description = "Returns list of sessions.", summary = "Sessions list", tags = "sessions", responses = {
            @ApiResponse(responseCode = "200",
                    description = "List of sessions",
                    content = @Content(
                            array = @ArraySchema(schema = @Schema(implementation = Session.class))),
                    headers = {@Header(name = "X-Total-Count", schema = @Schema(type = "integer"))}
    @SecurityRequirement(name = "openid-connect")
    public Response getSessions() {...} 

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:




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

Adding OpenAPI UI

To serve API specification in visual form and to allow API consumers to interact with API resources you can add OpenAPI UI by including dependency:


Dependency will include OpenAPI UI artifacts, in case you want to temporarily disable OpenAPI UI you can do so by setting configuration property:

      enabled: false

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

If you want to disable OpenAPI Dependency you can set the following property:

    enabled: false


Recent changes can be viewed on Github on the Releases Page


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.