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Chapter 2. Getting Started with Developing

Abstract

This chapter explains how to get started with Maven-based development, with a two-part project that illustrates how to develop applications using Apache CXF and Apache Camel.

2.1. Create a Web Services Project
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Overview
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This section describes how to generate a simple Web services project, which includes complete demonstration code for a server and a test client. The starting point for this project is the servicemix-cxf-code-first-osgi-bundle Maven archetype, which is a command-line wizard that creates the entire project from scratch. Instructions are then given to build the project, deploy the server to the Red Hat JBoss Fuse container, and run the test client.

Prerequisites
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In order to access artifacts from the Maven repository, you need to add the fusesource repository to Maven's settings.xml file. Maven looks for your settings.xml file in the following standard location:
  • UNIX: home/User/.m2/settings.xml
  • Windows: Documents and Settings\User\.m2\settings.xml
If there is currently no settings.xml file at this location, you need to create a new settings.xml file. Modify the settings.xml file by adding the repository element for fusesource, as highlighted in the following example: 
<settings>
    <profiles>
        <profile>
            <id>my-profile</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <repositories>
                <repository>
                    <id>fusesource</id>
                    <url>http://repo.fusesource.com/nexus/content/groups/public/</url>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                </repository>
                ...
            </repositories>
        </profile>
    </profiles>
    ...
</settings>
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Create project from the command line
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You can create a Maven project directly from the command line, by invoking the archetype:generate goal. First of all, create a directory to hold your getting started projects. Open a command prompt, navigate to a convenient location in your file system, and create the get-started directory, as follows: 
mkdir get-started
cd get-started
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You can now use the archetype:generate goal to invoke the servicemix-cxf-code-first-osgi-bundle archetype, which generates a simple Apache CXF demonstration, as follows: 
mvn archetype:generate
-DarchetypeGroupId=org.apache.servicemix.tooling
-DarchetypeArtifactId=servicemix-cxf-code-first-osgi-bundle
-DarchetypeVersion=2012.01.0.redhat-60024
-DgroupId=org.fusesource.example
-DartifactId=cxf-basic
-Dversion=1.0-SNAPSHOT
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Note
The arguments of the preceding command are shown on separate lines for readability, but when you are actually entering the command, the entire command must be entered on a single line.
You will be prompted to confirm the project settings, with a message similar to this one: 
[INFO] Using property: groupId = org.fusesource.example
[INFO] Using property: artifactId = cxf-basic
[INFO] Using property: version = 1.0-SNAPSHOT
[INFO] Using property: package = org.fusesource.example
Confirm properties configuration:
groupId: org.fusesource.example
artifactId: cxf-basic
version: 1.0-SNAPSHOT
package: org.fusesource.example
Y: :
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Type Return to accept the settings and generate the project. When the command finishes, you should find a new Maven project in the get-started/cxf-basic directory.

Spring XML configuration
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If you look in the cxf-basic/src/main/resources/META-INF/spring/beans.xml file, you can see an example of Spring XML configuration, as follows:

Example 2.1. Spring XML for Web Services Endpoint

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated by Apache ServiceMix Archetype -->
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jaxws="http://cxf.apache.org/jaxws"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
        http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd">

    <jaxws:endpoint id="HTTPEndpoint"
        implementor="org.fusesource.example.PersonImpl"
        address="/PersonServiceCF"/>

</beans>
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The purpose of this Spring XML file is to create a WS endpoint (that is, an instance of a Web service). The jaxws:endpoint element creates the WS endpoint and, in this example, it requires two attributes, as follows:
implementor
Specifies the class that implements the Service Endpoint Interface (SEI).
address
Specifies the WS endpoint address. In this example, instead of a HTTP URL, the address is specified as a relative path. In the context of JBoss Fuse, this is taken to mean that the Web service should be installed into the JBoss Fuse container's default Jetty container. By default, the specified path gets prefixed by http://localhost:8181/cxf/, so the actual address of the Web service becomes: 
http://localhost:8181/cxf/PersonServiceCF
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Build the Web services project
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Build the Web services project and install the generated JAR file into your local Maven repository. From a command prompt, enter the following commands: 
cd cxf-basic
mvn install
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Initialize container security
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If you have not already done so, create one (or more users) by adding a line of the following form to the InstallDir/etc/users.properties file: 
Username=Password[,RoleA][,RoleB]...
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At least one of the users must have the admin role, to enable administration of the fabric. For example: 
admin=secretpassword,admin
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Start up the container
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Start up the JBoss Fuse container. Open a new command prompt and enter the following commands: 
cd InstallDir/bin
fuse
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You will see a welcome screen similar to this: 
      _ ____                  ______
     | |  _ \                |  ____|             
     | | |_) | ___  ___ ___  | |__ _   _ ___  ___
 _   | |  _ < / _ \/ __/ __| |  __| | | / __|/ _ \
| |__| | |_) | (_) \__ \__ \ | |  | |_| \__ \  __/
 \____/|____/ \___/|___/___/ |_|   \__,_|___/\___|

  JBoss Fuse (6.0.0.redhat-xxx)
  http://www.redhat.com/products/jbossenterprisemiddleware/fuse/

Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or 'osgi:shutdown' to shutdown JBoss Fuse.

JBossFuse:karaf@root
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Deploy and start the WS server
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To install the cxf-basic Web service as an OSGi bundle, enter the following console command: 
JBossFuse:karaf@root> install mvn:org.fusesource.example/cxf-basic/1.0-SNAPSHOT
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Note
If your local Maven repository is stored in a non-standard location, you might need to customize the value of the org.ops4j.pax.url.mvn.localRepository property in the InstallDir/etc/org.ops4j.pax.url.mvn.cfg file, before you can use the mvn: scheme to access Maven artifacts.
If the bundle is successfully resolved and installed, the container responds by giving you the ID of the newly created bundle—for example: 
Bundle ID: 229
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You can now start up the Web service using the start console command, specifying the bundle ID, as follows: 
JBossFuse:karaf@root> start 229
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Check that the bundle has started
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To check that the bundle has started, enter the list console command, which gives the status of all the bundles installed in the container: 
JBossFuse:karaf@root> list
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Near the end of the listing, you should see a status line like the following: 
[ 229] [Active     ] [            ] [Started] [   60]
Apache ServiceMix :: CXF Code First OSGi Bundle (1.0.0.SNAPSHOT)
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Note
Actually, to avoid clutter, the list command only shows the bundles with a start level of 50 or greater (which excludes most of the system bundles).

Run the WS client
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The cxf-basic project also includes a simple WS client, which you can use to test the deployed Web service. In a command prompt, navigate to the cxf-basic directory and run the simple WS client as follows: 
cd get-started/cxf-basic
mvn -Pclient
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If the client runs successfully, you should see output like the following: 
INFO: Creating Service {http://example.fusesource.org/}PersonService from class org.fusesource.example.Person
Invoking getPerson...
getPerson._getPerson_personId=Guillaume
getPerson._getPerson_ssn=000-000-0000
getPerson._getPerson_name=Guillaume
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Troubleshooting
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If you have trouble running the client, there is an even simpler way to connect to the Web serivice. Open your favorite Web browser and navigate to the following URL to contact the JBoss Fuse Jetty container: 
http://localhost:8181/cxf?wsdl
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To query the WSDL directly from the PersonService Web service, navigate to the following URL: 
http://localhost:8181/cxf/PersonServiceCF?wsdl
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