Eclipse MicroProfile OpenAPI API

Since 4.1.2.182; 5.182

Provided version of the API: MicroProfile OpenAPI 1.1

Background

The OpenAPI API was designed to provide a standard interface for documenting and exposing RESTful APIs. The MicroProfile OpenAPI API provides a set of interfaces and annotations to allow application developers to produce an OpenAPI document from their JAX-RS applications. The OpenAPI API is somewhat similar to the Swagger API, so many concepts in the API will be familiar.

For a full overview of the API, review the documentation for the appropriate release.

MicroProfile OpenAPI 1.0 was released in MicroProfile 1.3.

Version 1.1 of the OpenAPI specification does not define the behaviour of implementations where multiple applications are deployed to the same container. This limitation will be addressed in a later version of the OpenAPI specification.

REST Endpoint

MicroProfile OpenAPI specifies that an OpenAPI document should be published at the endpoint /openapi documenting a deployed application. For both Payara Server and Payara Micro, this means that the endpoint can be found on any HTTP port (e.g. 8080) after deploying an application. The OpenAPI document displayed will always be for the most recently deployed application, except in the special case of disabling the service (see configuration).

By default the OpenAPI document is displayed in YAML format, although this can be changed to JSON by changing the Accept header of the request. Alternatively if using a browser, this can also be done by specifying a format query parameter. For example, http://localhost:8080/openapi?format=json. The valid values are json and yaml.

OpenAPI Configuration Sources

MicroProfile OpenAPI specifies several ways of configuring the data in the produced OpenAPI document. These are all provided by the OpenAPI API artifact:

<dependency>
    <groupId>org.eclipse.microprofile.openapi</groupId>
    <artifactId>microprofile-openapi-api</artifactId>
    <version>1.0</version>
</dependency>

Config Properties

The OpenAPI can be configured through the Config API. For example, these configuration properties can be put in the microprofile-config.properties.

Config key Value description

Config key	Value description
`mp.openapi.model.reader`	Configuration property to specify the fully qualified name of the OASModelReader implementation.
`mp.openapi.filter`	Configuration property to specify the fully qualified name of the OASFilter implementation.
`mp.openapi.scan.disable`	Configuration property to disable annotation scanning. Default value is `false`.
`mp.openapi.scan.packages`	Configuration property to specify the list of packages to scan. For example, `mp.openapi.scan.packages=com.xyz.PackageA,com.xyz.PackageB`
`mp.openapi.scan.classes`	Configuration property to specify the list of classes to scan. For example, `mp.openapi.scan.classes=com.xyz.MyClassA,com.xyz.MyClassB`
`mp.openapi.scan.exclude.packages`	Configuration property to specify the list of packages to exclude from scans. For example, `mp.openapi.scan.exclude.packages=com.xyz.PackageC,com.xyz.PackageD`
`mp.openapi.scan.exclude.classes`	Configuration property to specify the list of classes to exclude from scans. For example, `mp.openapi.scan.exclude.classes=com.xyz.MyClassC,com.xyz.MyClassD`
`mp.openapi.servers`	Configuration property to specify the list of global servers that provide connectivity information. For example, `mp.openapi.servers=https://xyz.com/v1,https://abc.com/v1`
`mp.openapi.servers.path.`	Prefix of the configuration property to specify an alternative list of servers to service all operations in a path. For example, `mp.openapi.servers.path./airlines/ngs/{id}=https://xyz.io/v1`
`mp.openapi.servers.operation.`	Prefix of the configuration property to specify an alternative list of servers to service an operation. Operations that want to specify an alternative list of servers must define an `operationId`, a unique string used to identify the operation. For example, `mp.openapi.servers.operation.getBooking=https://abc.io/v1`

mp.openapi.model.reader

Configuration property to specify the fully qualified name of the OASModelReader implementation.

mp.openapi.filter

Configuration property to specify the fully qualified name of the OASFilter implementation.

mp.openapi.scan.disable

Configuration property to disable annotation scanning. Default value is false.

mp.openapi.scan.packages

Configuration property to specify the list of packages to scan. For example, mp.openapi.scan.packages=com.xyz.PackageA,com.xyz.PackageB

mp.openapi.scan.classes

Configuration property to specify the list of classes to scan. For example, mp.openapi.scan.classes=com.xyz.MyClassA,com.xyz.MyClassB

mp.openapi.scan.exclude.packages

Configuration property to specify the list of packages to exclude from scans. For example, mp.openapi.scan.exclude.packages=com.xyz.PackageC,com.xyz.PackageD

mp.openapi.scan.exclude.classes

Configuration property to specify the list of classes to exclude from scans. For example, mp.openapi.scan.exclude.classes=com.xyz.MyClassC,com.xyz.MyClassD

mp.openapi.servers

Configuration property to specify the list of global servers that provide connectivity information. For example, mp.openapi.servers=https://xyz.com/v1,https://abc.com/v1

mp.openapi.servers.path.

Prefix of the configuration property to specify an alternative list of servers to service all operations in a path. For example, mp.openapi.servers.path./airlines/ngs/{id}=https://xyz.io/v1

mp.openapi.servers.operation.

Prefix of the configuration property to specify an alternative list of servers to service an operation. Operations that want to specify an alternative list of servers must define an operationId, a unique string used to identify the operation. For example, mp.openapi.servers.operation.getBooking=https://abc.io/v1

OASModelReader

org.eclipse.microprofile.openapi.OASModelReader

The OASModelReader interface can be implemented by an application developer. It must then be declared as an Config API variable in the form:

mp.openapi.model.reader=fish.payara.examples.OASModelReaderImpl

This class will be called at the beginning of the OpenAPI document generation, and will create the initial OpenAPI document.

OASFilter

org.eclipse.microprofile.openapi.OASFilter

The OASFilter interface can be implemented by an application developer. It must then be declared as an Config API variable in the form:

mp.openapi.filter=fish.payara.examples.OASFilterImpl

Each method in the implementation will be called on every appropriate element in the OpenAPI model. For example, the method filterPathItem(PathItem pathItem) will be called for every PathItem in the document. This class is called last, before the document is published.

Static Document

The MicroProfile OpenAPI supports using a static OpenAPI document to build from. This static file can be placed in either META-INF directory in a WAR file. Most often, this means putting the file in src/main/resources/META-INF.

The following file names are allowed for this file. The file given must also be in the specified format.

File Format Allowed File Names

File Format	Allowed File Names
`yaml`	`openapi.yaml` `openapi.yml`
`json`	`openapi.json`

yaml

openapi.yaml openapi.yml

json

openapi.json

Annotations

The MicroProfile OpenAPI API provides many annotations to use to augment the OpenAPI document. These are detailed in the OpenAPI Specification. These annotations are applied before the OASFilter.

Example

The following code could be used to give the corresponding operation an ID of "hello world".

import org.eclipse.microprofile.openapi.annotations.Operation;
...
    @GET
    @Operation(operationId = "hello world")
    public String helloWorld() {
        return "Hello World!";

OpenAPI Configuration

OpenAPI can be configured by using Admin Console or Asadmin commands.

Since 5.183

Using the Admin Console

To configure the OpenAPI in the Admin Console, go to Configuration → [instance-configuration (like server-config)] → MicroProfile → OpenAPI:

Set OpenAPI Configuration

Using Asadmin Commands

`set-openapi-configuration`

Usage

asadmin> set-openapi-configuration
        [--enabled=true|false]
        [--corsheaders=true|false]
        [--securityenabled=true|false]
        [--roles=<role-list>]
        [--target=<target[default:server]>]
        [--virtualservers=<virtualserver-list>]

Aim: Enables or disables the OpenAPI service.

When the OpenAPI service is disabled, the /openapi endpoint will always return a 403 error and any applications deployed during this period will not have an OpenAPI document built. Enabling the service again will not cause a documents to be built for any currently deployed applications.

Command Options

Option Type Description Default Mandatory

Option	Type	Description	Default	Mandatory
`enabled`	Boolean	Whether the service should be enabled/disabled.	true	No
`corsheaders`	Boolean	Whether or not CORS headers (e.g. `Access-Control-Allow-Origin=`) should be added to OpenAPI endpoint responses. Since Payara Server 5.192*	false	No
`securityenabled`	Boolean	Whether or not secure access to the openapi endpoint is enabled. Since Payara Server 5.193	false	No
`roles`	String	If defined, the endpoint will be assigned to a list of the role specified as a comma-separated. Since Payara Server 5.193	`microprofile`	No
`target`	String	The target Payara config to apply the change to.	server-config	No
`virtualservers`	String	If defined, the '/openapi' endpoint will be assigned to the list of virtual servers specified as a comma-separated list of names. Otherwise, the endpoint will be assigned to all virtual servers available. Since Payara Server 4.1.2.184 and 5.184	-	No

enabled

Boolean

Whether the service should be enabled/disabled.

true

corsheaders

Boolean

Whether or not CORS headers (e.g. Access-Control-Allow-Origin=*) should be added to OpenAPI endpoint responses.

Since Payara Server 5.192

false

securityenabled

Boolean

Whether or not secure access to the openapi endpoint is enabled.

Since Payara Server 5.193

false

roles

String

If defined, the endpoint will be assigned to a list of the role specified as a comma-separated.

Since Payara Server 5.193

microprofile

target

String

The target Payara config to apply the change to.

server-config

virtualservers

String

If defined, the '/openapi' endpoint will be assigned to the list of virtual servers specified as a comma-separated list of names. Otherwise, the endpoint will be assigned to all virtual servers available. Since Payara Server 4.1.2.184 and 5.184

`get-openapi-configuration`

Usage

asadmin> get-openapi-configuration
    [--target=<target>]

Aim: Gets the status of the OpenAPI service.

Command Options

Option Type Description Default Mandatory

Option	Type	Description	Default	Mandatory
`target`	String	The target Payara config to apply the change to.	server-config	false

target

String

The target Payara config to apply the change to.

server-config

false

Security Configuration

By default, OpenAPI endpoints binds to root context application which is default-web-module (docroot) system application and default-web-module application uses default realm (file) of server. If user application deployed with the empty context-root then the security configuration of the deployed application will be shared by OpenAPI endpoints.