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<h1 class="page">WebStart (JNLP) Deployment</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>When you <a href="../sdk/application_deployment.html" class="page">use the jMonkeyEngine SDK to deploy your application</a>, you can configure the project to build files required for WebStart automatically. If you use another IDE, or work on the command line, use the following tips to set up WebStart correctly:</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="problem-statement"><a class="anchor" href="#problem-statement"></a>Problem Statement</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>Problem:</strong></p>
</div>
<div class="paragraph">
<p>When running under WebStart, jMonkeyEngine may not have permission to extract the native libraries to the current directory.</p>
</div>
<div class="paragraph">
<p>*Solution: *</p>
</div>
<div class="paragraph">
<p>You can instruct WebStart to load the native libraries itself using the JNLP file, and then instruct jME3 not to try to do so itself.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="simple-way"><a class="anchor" href="#simple-way"></a>Simple way</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can import the LWJGL JNLP extension directly into your extension, however be aware that your application will break whenever they update their jars. Simply add this line to your JNLP:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml">&lt;extension name="lwjgl" href="http://lwjgl.org/webstart/2.7.1/extension.jnlp" /&gt;</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="reliable-way"><a class="anchor" href="#reliable-way"></a>Reliable way</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="native-jars"><a class="anchor" href="#native-jars"></a>Native jars</h3>
<div class="paragraph">
<p>You can download the LWJGL native jars from their site, or to ensure you&#8217;re using the exact same version as bundled with your jME3 release, make your own:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>mkdir tmp
cd tmp
jar xfv ../jME3-lwjgl-natives.jar
cd native
for i in *; do
  cd $i
  jar cfv ../../native_$i.jar .
  cd ..
done</code></pre>
</div>
</div>
<div class="paragraph">
<p>For Windows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>@echo off
md tmp
cd tmp
"%JDK_HOME%\bin\jar" -xfv ..\jME3-lwjgl-natives.jar
cd native
for /D %%i in ("*") do (
  cd %%i
  "%JDK_HOME%\bin\jar" -cfv ..\..\native_%%i%.jar .
  cd ..
)
cd ..</code></pre>
</div>
</div>
<div class="paragraph">
<p>Remember to sign all the jar files and move them into the right place from the tmp directory.</p>
</div>
</div>
<div class="sect2">
<h3 id="jnlp-file"><a class="anchor" href="#jnlp-file"></a>JNLP file</h3>
<div class="paragraph">
<p>Add the following to your JNLP file:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml">  &lt;resources os="Windows"&gt;
    &lt;j2se version="1.4+"/&gt;
    &lt;nativelib href="native_windows.jar"/&gt;
  &lt;/resources&gt;
  &lt;resources os="Linux"&gt;
    &lt;j2se version="1.4+"/&gt;
    &lt;nativelib href="native_linux.jar"/&gt;
  &lt;/resources&gt;
  &lt;resources os="Mac OS X"&gt;
    &lt;j2se version="1.4+"/&gt;
    &lt;nativelib href="native_macosx.jar"/&gt;
  &lt;/resources&gt;</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="set-low-permissions-mode"><a class="anchor" href="#set-low-permissions-mode"></a>Set low-permissions mode</h3>
<div class="paragraph">
<p>In your main() method, if running under WebStart, tell jME3 it is running in a low-permission environment so that it doesn&#8217;t try to load the natives itself:</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)
  {
      if (System.getProperty("javawebstart.version") != null) {
        JmeSystem.setLowPermissions(true);
      }</code></pre>
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