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<h1 class="page">jME3 Headless Server</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>When adding multiplayer to your game, you may find that your server needs to know about game state (e.g. where are players, objects? Was that a direct hit? etc.) You can code all this up yourself, but there&#8217;s an easier way.</p>
</div>
<div class="paragraph">
<p>It&#8217;s very easy to change your current (client) game to function as a server as well.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="what-does-headless-mean"><a class="anchor" href="#what-does-headless-mean"></a>What Does Headless Mean?</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A headless server…</p>
</div>
<div class="ulist">
<ul>
<li>
<p>does not display any output – no window opens, no audio plays, no graphics are rendered.</p>
</li>
<li>
<p>ignores all input – no input handling.</p>
</li>
<li>
<p>keeps game state – you can attach to, transform, and save the rootNode, although the scene is not displayed.</p>
</li>
<li>
<p>calls the <code>simpleUpdate()</code> loop – you can run tests and trigger events as usual.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="client-code"><a class="anchor" href="#client-code"></a>Client Code</h2>
<div class="sectionbody">
<div class="paragraph">
<p>First, let&#8217;s take a look at the default way of creating a new game (in its simplest form):</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public static void main(String[] args) {
  Application app = new Main();
  app.start();
}</code></pre>
</div>
</div>
</div>
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<div class="sect1">
<h2 id="headless-server-code"><a class="anchor" href="#headless-server-code"></a>Headless Server Code</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Now, with a simple change you can start your game in Headless mode. This means that all input and audio/visual output will be ignored. That&#8217;s a good thing for a server.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">import com.jme3.system.JmeContext;
import com.jme3.system.JmeContext.Type;

public static void main(String[] args) {
  Application app = new Main();
  app.start(JmeContext.Type.Headless);
}</code></pre>
</div>
</div>
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</div>
<div class="sect1">
<h2 id="next-steps"><a class="anchor" href="#next-steps"></a>Next steps</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Okay, so you can now start your game in a headless 'server mode', where to go from here?</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Parse <code>String[] args</code> from the <code>main</code>-method to enable server mode on demand (e.g. start your server like <code>java -jar mygame.jar –server</code>.</p>
</li>
<li>
<p>Integrate <a href="networking.html" class="page">SpiderMonkey</a>, to provide game updates to the server over a network.</p>
</li>
<li>
<p>Only execute code that&#8217;s needed. (E.g. place all rendering code inside an <code>if (servermode)</code>-block) (or <code>if (!servermode)</code> for the client).</p>
</li>
<li>
<p>Add decent <a href="logging.html" class="page">logging</a> so your server actually makes sense.</p>
</li>
</ul>
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