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Tutorial: JaxRS Remote Services on Karaf

Introduction

CXF can be run on Karaf as an ECF distribution provider for JaxRS-based remote services that fully support OSGi R7 remote services.

This tutorial describes installing and running an example JaxRS remote service on Karaf.

Requirements: Karaf 4.2+ running on Java 8

Install CXF Distribution Provider Karaf Console

Add the ECF repo:

karaf@root()>feature:repo-add ecf

Install the CXF Distribution Provider

karaf@root()>feature:install ecf-rs-distribution-cxf

To properly run in Karaf the org.osgi.service.http.port system property must be set to the desired port:

karaf@root()> system:property -p org.osgi.service.http.port 8181

Shutdown and restart Karaf

Install of JaxRS Student Example

In this tutorial an example REST service is presented. The completed example bundles with source are available in the ECF JaxRSProviders repository. To run this example you may wish to clone this repo, and import into Eclipse these projects: examples/com.mycorp.examples.student, examples/com.mycorp.examples.remoteservice.host, and examples/com.mycorp.examples.client.

Install of Student Example Service Client and Host

karaf@root()> feature:install ecf-rs-examples-jaxrs-student-client
karaf@root()> feature:install ecf-rs-examples-jaxrs-student-host

This should produce output indicating the StudentService was exported

karaf@root()> feature:install ecf-rs-examples-jaxrs-student-host
16:17:04.904;EXPORT_REGISTRATION;exportedSR=[com.mycorp.examples.student.Student
Service];cID=URIID [uri=http://localhost:8181/1];rsId=1
--Endpoint Description---
<endpoint-descriptions xmlns="http://www.osgi.org/xmlns/rsa/v1.0.0">
  <endpoint-description>
    <property name="ecf.endpoint.id" value-type="String" value="http://localhost:8181/1"/>
    <property name="ecf.endpoint.id.ns" value-type="String" value="ecf.namespace.jaxrs"/>
    <property name="ecf.endpoint.ts" value-type="Long" value="1530573424662"/>
    <property name="ecf.rsvc.id" value-type="Long" value="1"/>
    <property name="endpoint.framework.uuid" value-type="String" value="7473f8a1-f0ac-4146-8087-0558ed8e46aa"/>
    <property name="endpoint.id" value-type="String" value="c9e3bb65-f157-40fe-b4bb-6c98c926ca03"/>
    <property name="endpoint.package.version.com.mycorp.examples.student" value-type="String" value="1.0.0"/>
    <property name="endpoint.service.id" value-type="Long" value="162"/>
    <property name="objectClass" value-type="String">
      <array>
        <value>com.mycorp.examples.student.StudentService</value>
      </array>
    </property>
    <property name="osgi.basic.timeout" value-type="String" value="50000"/>
    <property name="remote.configs.supported" value-type="String">
      <array>
        <value>ecf.jaxrs.cxf.server</value>
      </array>
    </property>
    <property name="remote.intents.supported" value-type="String">
      <array>
        <value>passByValue</value>
        <value>exactlyOnce</value>
        <value>ordered</value>
        <value>osgi.async</value>
        <value>osgi.private</value>
        <value>osgi.confidential</value>
        <value>jaxrs</value>
      </array>
    </property>
    <property name="service.imported" value-type="String" value="true"/>
    <property name="service.imported.configs" value-type="String">
      <array>
        <value>ecf.jaxrs.cxf.server</value>
      </array>
    </property>
    <property name="service.intents" value-type="String" value="osgi.async"/>
  </endpoint-description>
</endpoint-descriptions>
---End Endpoint Description
Discovered student service=com.mycorp.examples.student.remoteservice.host.StudentServiceImpl@51154196
Student0=Student [id=06f375e2-859d-4077-9bf4-edf8a1128439, name=Joe Senior, grade=First, address=Address [street=111 Park Ave, city=New York, state=NY, postalCode=11111]]
Updated Student0=Student [id=06f375e2-859d-4077-9bf4-edf8a1128439, name=Joe Senior, grade=Eighth, address=Address [street=111 Park Ave, city=New York, state=NY, postalCode=11111]]
Student=0=Student [id=06f375e2-859d-4077-9bf4-edf8a1128439, name=Joe Senior, grade=Eighth, address=Address [street=111 Park Ave, city=New York, state=NY, postalCode=11111]]
Created student=Student [id=ba408587-9546-45f2-b311-9b2d65c5761c, name=April Snow, grade=null, address=null]
Updated student=Student [id=ba408587-9546-45f2-b311-9b2d65c5761c, name=April Snow, grade=First, address=Address [street=111 NE 1st, city=Austin, state=Oregon, postalCode=97200]]
Deleted student=Student [id=ba408587-9546-45f2-b311-9b2d65c5761c, name=April Snow, grade=First, address=Address [street=111 NE 1st, city=Austin, state=Oregon, postalCode=97200]]

The output in between the --Start Endpoint Description-- and ---End Endpoint Description--- is debug output from the ECF RSA Console for the remote service export.

The output that begins Discovered student service... is output from the StudentService consumer when the remote service is discovered and injected into the client component so that it can be called. This output shows the invocation of the JaxRS remote service methods by the client component.

For reference, the client component's source code is here.

Using Jersey JaxRS Rather than CXF

To use Jersey rather than CXF, all that's necessary is to install the jersey server and client distribution providers rather than CXF providers:

karaf@root()>feature:install ecf-rs-distribution-jersey

The Jersey distribution provider should be installed instead of than the CXF distribution provider. The reason for this is that since CXF and Jersey are both implementations of the JaxRS specification they cannot be installed together on the same server.

Once the Jersey provider is installed, the StudentService example may be installed and run in the same way as shown above, but now the Jersey implementation will be used as the distribution system for the StudentService.

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