<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

-->

Apache Karaf REST Example

Abstract

This example shows how to use JAX-RS to implement a REST service.

This example uses blueprint to deal with the jaxrs-server and Apache CXF as the implementation of the JAXRS specification.

It implements a BookingService with a REST implementation.

The “client” bundle uses the BookingService with a REST client stub.

Artifacts

• karaf-rest-example-api is a common bundle containing the Booking POJO and the BookingService interface.
• karaf-rest-example-blueprint is a blueprint bundle providing the BookingServiceRest implementation of the BookingService interface.
• karaf-rest-example-scr is a SCR bundle providing the BookingServiceRest implementation of the BookingService interface.
• karaf-rest-example-client is a regular Blueprint bundle using the BookingService.
• karaf-rest-example-client-http is a regular Blueprint REST client bundle using Java Http.
• karaf-rest-example-client-cxf is a regular Blueprint REST client bundle using Apache CXF.
• karaf-rest-example-whiteboard is another way to deploy REST services using whiteboard pattern.
• karaf-rest-example-features provides a Karaf features repository used for the deployment.

Build

The build uses Apache Maven. Simply use:

mvn clean install

Feature and Deployment

On a running Karaf instance, register the features repository using:

karaf@root()> feature:repo-add mvn:org.apache.karaf.examples/karaf-rest-example-features/LATEST/xml

Then, you can install the service blueprint provider or service SCR provider feature:

karaf@root()> feature:install karaf-rest-example-blueprint

karaf@root()> feature:install karaf-rest-example-scr

And the service client feature using Java Http:

karaf@root()> feature:install karaf-rest-example-client-http

The karaf-rest-example-client-http feature provides booking:* commands you can use to call the REST service.

And the service client feature using Apache CXF:

karaf@root()> feature:install karaf-rest-example-client-cxf

The karaf-rest-example-client-cxf feature provides booking:* commands you can use to call the REST service.

Usage

Once you have install a client feature, you can use booking:add and booking:list commands to interact with the REST service.

karaf@root()> booking:add 1 "John Doe" AF520
karaf@root()> booking:list

Whiteboard

Instead of the CXF with blueprint karaf-rest-example-blueprint feature, or CXF with SCR karaf-rest-example-scr feature, you can use the JAXRS Whiteboard approach (with Aries implementation).

Install the karaf-rest-example-whiteboard feature:

karaf@root()> feature:install karaf-rest-example-whiteboard