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<h1 id="releasing-epsilon-to-maven-central">Releasing Epsilon to Maven Central<a class="headerlink" href="#releasing-epsilon-to-maven-central" title="Permanent link">&para;</a></h1>
<p>This article describes the overall process required to release a new stable release of Epsilon to Maven Central. There are a few steps involved, some of which are outside our control. The guide will describe the steps that we do control, and point you to the relevant resources for the others.</p>
<h2 id="preparation">Preparation<a class="headerlink" href="#preparation" title="Permanent link">&para;</a></h2>
<p>The first step is to gain deploy rights to our <code>org.eclipse.epsilon</code> groupId in the <a href="https://oss.sonatype.org/">Sonatype OSS</a> Nexus repository. To do this, please register at the <a href="https://issues.sonatype.org/">Sonatype JIRA</a> and give your JIRA username to the Epsilon release engineer(s), so we may file a ticket to have deploy rights granted to you.</p>
<h2 id="testing-the-plain-maven-build">Testing the Plain Maven build<a class="headerlink" href="#testing-the-plain-maven-build" title="Permanent link">&para;</a></h2>
<p>Our plain Maven artifacts are built through a parallel hierarchy of <code>pom-plain.xml</code> files, starting from the root of the Epsilon repository.
To do a plain Maven compilation + test build from scratch, simply run this:</p>
<div class="highlight"><pre><span></span><code>mvn -f pom-plain.xml clean test
</code></pre></div>
<p>Keep in mind that plain Maven builds do not run unit tests, as we already run those in the Tycho build.
Make sure that all tests pass in the Tycho build first.</p>
<p>Double check the dependencies in the various <code>pom-plain.xml</code> files, especially those related to external libraries.</p>
<p>Check the project metadata in the <code>pom-plain.xml</code> file, which lists the current developers, SCM URLs, and other details.</p>
<h2 id="preparing-a-maven-release-branch">Preparing a Maven release branch<a class="headerlink" href="#preparing-a-maven-release-branch" title="Permanent link">&para;</a></h2>
<p>Once the new stable version of Epsilon has been tagged, create a Maven release branch with:</p>
<div class="highlight"><pre><span></span><code>git checkout -b maven-RELEASE RELEASE-TAG
</code></pre></div>
<p>Set the version in the <code>pom-plain.xml</code> files:</p>
<div class="highlight"><pre><span></span><code>mvn -f pom-plain.xml versions:set
</code></pre></div>
<p>Enter the version number of the release, and create a commit for it:</p>
<div class="highlight"><pre><span></span><code>git add ...
git commit -m <span class="s2">&quot;Set plain Maven versions to RELEASE&quot;</span>
</code></pre></div>
<p>Push the commit to Jenkins:</p>
<div class="highlight"><pre><span></span><code>git push
</code></pre></div>
<p>If you need to make any other tweaks for the Maven release, you may want to try them here first rather than pollute <code>master</code>.
Once the release is out, you may want to cherry-pick those tweaks back into <code>master</code>.</p>
<h2 id="release-to-maven-central">Release to Maven Central<a class="headerlink" href="#release-to-maven-central" title="Permanent link">&para;</a></h2>
<p>The Jenkins build will automatically sign the plain Maven JARs and create a new staging repository in the OSSRH Sonatype Nexus server.
It will also attempt to "close" it to modification, which will trigger the Maven Central validation rules.
If one of these rules fail, the repository will be left open: the violations will be recorded in the Jenkins build logs, and you can try to manually close the repository and see those checks applied once more.</p>
<p>As a precaution, we require all staging repositories to be manually checked before we release them to Maven Central.
Once the Jenkins build passes, log into <a href="https://oss.sonatype.org/">Sonatype OSS</a> with your JIRA credentials and check the "Staging Repositories" section.
Search for "epsilon" and you should be able to see the newly created staging repository.</p>
<p>Select the repository and check in the "Contents" tab that everything is in order. If you are not happy with it, you can drop the repository, add more commits to the Maven release branch, and retry the upload. If you are happy with the contents, click on "Release" and enter an appropriate message in the "Reason" field (usually, "Stable release RELEASE of Eclipse Epsilon" suffices).</p>
<p>After about an hour or so, the staging repository will disappear, and after a few hours the contents of the repository should be available from <a href="https://search.maven.org/">Maven Central</a>. This may take up to a day, so be patient!</p>
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