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Chapter 11. Building an OSGi Bundle

Abstract

This chapter describes how to build an OSGi bundle using Maven. For building bundles, the Maven bundle plug-in plays a key role, because it enables you to automate the generation of OSGi bundle headers (which would otherwise be a tedious task). Maven archetypes, which generate a complete sample project, can also provide a starting point for your bundle projects.

11.1. Generating a Bundle Project
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Generating bundle projects with Maven archetypes
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To help you get started quickly, you can invoke a Maven archetype to generate the initial outline of a Maven project (a Maven archetype is analogous to a project wizard). The following Maven archetypes can generate projects for building OSGi bundles:

Apache CXF code-first archetype
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The Apache CXF code-first archetype creates a project for building a service from Java. To generate a Maven project with the coordinates, GroupId:ArtifactId:Version, enter the following command: 
mvn archetype:generate
-DarchetypeGroupId=org.apache.servicemix.tooling
-DarchetypeArtifactId=servicemix-cxf-code-first-osgi-bundle
-DarchetypeVersion=2012.01.0.redhat-60024
-DgroupId=GroupId
-DartifactId=ArtifactId
-Dversion=Version
Note
The arguments to the mvn command are shown on separate lines purely for the sake of readability. When you are entering the command at a command prompt, you must ensure that all of the parameters are on the same line.

Apache CXF WSDL-first archetype
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The Apache CXF WSDL-first archetype creates a project for building a service from WSDL. To generate a Maven project with the coordinates, GroupId:ArtifactId:Version, enter the following command: 
mvn archetype:generate
-DarchetypeGroupId=org.apache.servicemix.tooling
-DarchetypeArtifactId=servicemix-cxf-wsdl-first-osgi-bundle
-DarchetypeVersion=2012.01.0.redhat-60024
-DgroupId=GroupId
-DartifactId=ArtifactId
-Dversion=Version

Apache Camel archetype
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The Apache Camel OSGi archetype creates a project for building a route that can be deployed into the OSGi container. To generate a Maven project with the coordinates, GroupId:ArtifactId:Version, enter the following command: 
mvn archetype:generate
-DarchetypeGroupId=org.apache.servicemix.tooling
-DarchetypeArtifactId=servicemix-camel-osgi-bundle
-DarchetypeVersion=2012.01.0.redhat-60024
-DgroupId=GroupId
-DartifactId=ArtifactId
-Dversion=Version

Building the bundle
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By default, the preceding archetypes create a project in a new directory, whose names is the same as the specified artifact ID, ArtifactId. To build the bundle defined by the new project, open a command prompt, go to the project directory (that is, the directory containing the pom.xml file), and enter the following Maven command: 
mvn install
The effect of this command is to compile all of the Java source files, to generate a bundle JAR under the ArtifactId/target directory, and then to install the generated JAR in the local Maven repository.
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