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<p>Before you can start coding in Maven, either to search and fix a bug or to do any enhancements, you will probably be looking for a starting point what code gets executed during a mvn install or a similar call.</p>

<p>This document will provide a walk-through of the Maven source code. Please refer to xxx about how to checkout the sources and build Maven yourself.</p>

<h1>Entry point: Maven's main method</h1>

<p>When called from the command line, the main method of the class org.apache.maven.cli.MavenCli (as in Command Line Interface) will be called.</p>

<p>The sequence of action is roughly:</p>
<ul>
	<li>Parse the command line, using the embedded CLIManager class, making use of the <a href="http://commons.apache.org/cli/">Commons CLI</a></li>
	<li>Start the Plexus container: embedder.start( classWorld ).</li>
	<li>Create a Maven Execution Request.</li>
	<li>Have Plexus create a Maven instance. (In most cases this will be org.apache.maven.DefaultMaven.)</li>
	<li>Have the Maven instance execute the execution request. ( maven.execute(Request) ).</li>
</ul>

<p>This is where the command line specific invocation ends.</p>

<h1>Maven in action: Subjects and Objects</h1>

<p>The DefaultMaven instantiates a bunch of objects which interact during the execution of a request.</p>

<p>These are:</p>
<ul>
	<li>The ReactorManager (org.apache.maven.execution.ReactorManager)</li>
	<li>A MavenSession (org.apache.maven.execution.MavenSession)</li>
</ul>

<p>The session is executed by the LifecycleExecutor (org.apache.maven.lifecycle.LifecycleExecutor).</p>

<h2>The ReactorManager</h2>

<p>Many users of Maven associate the reactor with multiple project setups, maybe because in a multi-module project, you will see a reactor build order as part of the Maven output. But the ReactorManager is not only used in case of multi-module projects, but also for single projects. </p>

<h2>The MavenSession</h2>
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