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<p><a name="ESAMavenPluginProject-ESAMavenPlugin"></a></p>
<h1 id="esa-maven-plugin">ESA Maven Plugin<a class="headerlink" href="#esa-maven-plugin" title="Permanent link">&para;</a></h1>
<p>This page describes the <code>esa-maven-plugin</code> version 1.0.0 which is available from Maven Central.</p>
<p>The ESA Maven Plugin provides the ability to generate ESA archives using
Maven. The ESA archive format is defined in the Subsystems Service Specification which was part of <a href="http://www.osgi.org/Specifications/HomePage">OSGi Enterprise R5</a>. An ESA archive can optionally contain an Subsystem manifest
(<code>SUBSYSTEM.MF</code>). This can be added in one of two ways</p>
<ol>
<li>Hand written and added into the archive.</li>
<li>Generated based on pom configuration.</li>
</ol>
<p><a name="ESAMavenPluginProject-UsingthePlugin"></a></p>
<h2 id="using-the-plugin">Using the Plugin<a class="headerlink" href="#using-the-plugin" title="Permanent link">&para;</a></h2>
<p>The plugin is included by as follows:</p>
<div class="codehilite"><pre><span class="nt">&lt;project&gt;</span>
...
<span class="nt">&lt;packaging&gt;</span>esa<span class="nt">&lt;/packaging&gt;</span> <span class="c">&lt;!-- set packaging type to esa --&gt;</span>
<span class="nt">&lt;build&gt;</span>
<span class="nt">&lt;plugins&gt;</span>
<span class="nt">&lt;plugin&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.apache.aries<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>esa-maven-plugin<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;version&gt;</span>1.0.0<span class="nt">&lt;/version&gt;</span>
<span class="nt">&lt;extensions&gt;</span>true<span class="nt">&lt;/extensions&gt;</span>
<span class="nt">&lt;/plugin&gt;</span>
<span class="nt">&lt;/plugins&gt;</span>
<span class="nt">&lt;/build&gt;</span>
<span class="nt">&lt;/project&gt;</span>
</pre></div>
<p>By default it will not generate a manifest, so in the above example it will
attempt to copy a pre-defined <code>SUBSYSTEM.MF</code> from
<code>src/main/resources/META-INF</code>. If that file does not exist, then no
Subsystem manifest will be included.</p>
<p><a name="ESAMavenPluginProject-GeneratinganSUBSYSTEM.MF"></a></p>
<h2 id="generating-an-subsystemmf">Generating an SUBSYSTEM.MF<a class="headerlink" href="#generating-an-subsystemmf" title="Permanent link">&para;</a></h2>
<p>The following example <code>pom.xml</code> shows how to get the plugin to generate an
<code>SUBSYSTEM.MF</code> based on the pom configuration:</p>
<div class="codehilite"><pre><span class="nt">&lt;project&gt;</span>
<span class="nt">&lt;modelVersion&gt;</span>4.0.0<span class="nt">&lt;/modelVersion&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.something<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>esa-maven-plugin-test<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;version&gt;</span>1.0.0-SNAPSHOT<span class="nt">&lt;/version&gt;</span>
<span class="nt">&lt;packaging&gt;</span>esa<span class="nt">&lt;/packaging&gt;</span>
<span class="nt">&lt;dependencies&gt;</span>
<span class="c">&lt;!-- Put some dependencies in here --&gt;</span>
<span class="nt">&lt;/dependencies&gt;</span>
<span class="nt">&lt;build&gt;</span>
<span class="nt">&lt;plugins&gt;</span>
<span class="nt">&lt;plugin&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.apache.aries<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>esa-maven-plugin<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;version&gt;</span>1.0.0<span class="nt">&lt;/version&gt;</span>
<span class="nt">&lt;extensions&gt;</span>true<span class="nt">&lt;/extensions&gt;</span>
<span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;generateManifest&gt;</span>true<span class="nt">&lt;/generateManifest&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
<span class="nt">&lt;/plugin&gt;</span>
<span class="nt">&lt;/plugins&gt;</span>
<span class="nt">&lt;/build&gt;</span>
<span class="nt">&lt;/project&gt;</span>
</pre></div>
<p>The pom to subsystem manfiest header mapping is as follows:</p>
<ul>
<li>Pom &lt;groupId/&gt;.&lt;artifactId/&gt; -&gt; Subsystem-SymbolicName</li>
<li>Pom &lt;name/&gt; -&gt; Subsystem-Name</li>
<li>Pom &lt;version/&gt; -&gt; Subsystem-Version (cleaned up for OSGi)</li>
<li>Pom &lt;description/&gt; -&gt; Subsystem-Description</li>
<li>Pom &lt;dependencies/&gt; -&gt; Subsystem-Content</li>
</ul>
<p><a name="ESAMavenPluginProject-OverridingSubsystem-SymbolicName"></a></p>
<h2 id="overriding-subsystem-symbolicname">Overriding Subsystem-SymbolicName<a class="headerlink" href="#overriding-subsystem-symbolicname" title="Permanent link">&para;</a></h2>
<p>The subsystem symbolic name defaults to the
${project.groupId}.${project.artifactId}. The following shows how to override
this:</p>
<div class="codehilite"><pre><span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;instructions&gt;</span>
<span class="nt">&lt;Subsystem</span><span class="err">-SymbolicName</span><span class="nt">&gt;</span><span class="cp">${</span><span class="n">project</span><span class="o">.</span><span class="n">artifaceId</span><span class="cp">}</span><span class="nt">&lt;/Subsystem-SymbolicName&gt;</span>
<span class="nt">&lt;/instructions&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
</pre></div>
<p><a name="ESAMavenPluginProject-Archivecontent"></a></p>
<h2 id="including-bundles-in-the-archive">Including bundles in the archive<a class="headerlink" href="#including-bundles-in-the-archive" title="Permanent link">&para;</a></h2>
<p>By default, the archive will only include the direct dependencies of the project. The <code>&lt;archiveContent/&gt;</code> element can be used to control the archive artifact contents. The following shows how to include all direct and transitive dependencies.</p>
<div class="codehilite"><pre><span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;archiveContent&gt;</span>all<span class="nt">&lt;/archiveContent&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
</pre></div>
<p>The following shows how to exclude all dependencies from the archive. This is useful if you just want the subsystem definition and will use a bundle repository to provision the bundles during deployment.</p>
<div class="codehilite"><pre><span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;archiveContent&gt;</span>none<span class="nt">&lt;/archiveContent&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
</pre></div>
<p>The following specifies the default of including only the direct dependencies (assumes the subsystem contents and direct dependencies are the same).</p>
<div class="codehilite"><pre><span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;archiveContent&gt;</span>content<span class="nt">&lt;/archiveContent&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
</pre></div>
<p><a name="ESAMavenPluginProject-StartOrder"></a></p>
<h2 id="content-bundle-start-ordering">Content Bundle Start Ordering<a class="headerlink" href="#content-bundle-start-ordering" title="Permanent link">&para;</a></h2>
<p>By default, the Subsystem runtime can start content bundles in any order. The OSGi start level service is not applicable to subsystems. You can specify the start order of the bundles based on the order in which they're expressed as dependencies in the maven pom using the following:</p>
<div class="codehilite"><pre><span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;startOrder&gt;</span>dependencies<span class="nt">&lt;/startOrder&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
</pre></div>
<p><a name="ESAMavenPluginProject-ExistingSUBSYSTEM.MF"></a></p>
<h2 id="including-an-existing-subsystem-manifest">Including an Existing Subsystem manifest<a class="headerlink" href="#including-an-existing-subsystem-manifest" title="Permanent link">&para;</a></h2>
<p>If you don't wish to generate the Subsystem manifest based on the pom configuration, you can add an existing one as follows:</p>
<div class="codehilite"><pre><span class="nt">&lt;configuration&gt;</span>
<span class="nt">&lt;subsystemManifestFile&gt;</span><span class="cp">${</span><span class="n">basedir</span><span class="cp">}</span>/src/main/resources/OSGI-INF/SUBSYSTEM.MF<span class="nt">&lt;/subsystemManifestFile&gt;</span>
<span class="nt">&lt;/configuration&gt;</span>
</pre></div>
<p><a name="ESAMavenPluginProject-OtherHeaders"></a></p>
<h2 id="including-other-headers">Including Other Headers<a class="headerlink" href="#including-other-headers" title="Permanent link">&para;</a></h2>
<p>You can add any other headers in addition to those calculated from the pom configuration. For example, the following specifies the Subsystem Use-Bundle header and sets the Subsystem-Type to be a feature:</p>
<div class="codehilite"><pre><span class="nt">&lt;instructions&gt;</span>
<span class="nt">&lt;Use-Bundle&gt;</span>org.apache.aries.test.Bundle;version=1.0.0-SNAPSHOT<span class="nt">&lt;/Use-Bundle&gt;</span>
<span class="nt">&lt;Subsystem-Type&gt;</span>osgi.subsystem.feature<span class="nt">&lt;/Subsystem-Type&gt;</span>
<span class="nt">&lt;/instructions&gt;</span>
</pre></div></div>
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