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Chapter 6. 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.

6.1. 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 karaf-soap-archetype archetype
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The Apache CXF karaf-soap-archetype 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=io.fabric8.archetypes \
  -DarchetypeArtifactId=karaf-soap-archetype \
  -DarchetypeVersion=1.2.0.redhat-133 \
  -DgroupId=GroupId \
  -DartifactId=ArtifactId \
  -Dversion=Version \
  -Dfabric8-profile=ProfileName
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Note
The backslash character, \, indicates line continuation on Linux and UNIX operating systems. On Windows platforms, you must omit the backslash character and put all of the arguments on a single line.

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.camel.archetypes \
  -DarchetypeArtifactId=camel-archetype-blueprint \
  -DarchetypeVersion=2.15.1.redhat-620133 \
  -DgroupId=GroupId \
  -DartifactId=ArtifactId \
  -Dversion=Version
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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
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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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