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<h1 class="page">troubleshooting</h1>
<div class="sect1">
<h2 id="troubleshooting-jmonkeyengine3-sdk"><a class="anchor" href="#troubleshooting-jmonkeyengine3-sdk"></a>Troubleshooting jMonkeyEngine3 SDK</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="graphics-card-driver"><a class="anchor" href="#graphics-card-driver"></a>Graphics Card Driver</h3>
<div class="paragraph">
<p><strong>On Windows and Linux make sure you have the latest driver installed. Make sure its the one supplied by the card manufacturer and not just the <abbr title="Operating System">OS</abbr>-default one.</strong> On OSX, make sure you have the latest update for your MacOS.</p>
</div>
</div>
<div class="sect2">
<h3 id="stability-graphics-issues"><a class="anchor" href="#stability-graphics-issues"></a>Stability / Graphics issues</h3>
<div class="paragraph">
<p>On some Linux and Windows systems, the SDK might perform unstable and quit with native VM crashes or &#8220;x&#8221; errors. There are a few things one can try to remedy those issues.</p>
</div>
<div class="sect3">
<h4 id="heavyweight-canvas"><a class="anchor" href="#heavyweight-canvas"></a>Heavyweight Canvas</h4>
<div class="paragraph">
<p>First of all there&#8217;s the new &#8220;OpenGL&#8221; settings page in the SDK global settings where you can enable the &#8220;Heavyweight Canvas&#8221;, which solved some issues for some people. The settings panel can be found under <code><span class="menuseq"><b class="menu">Tools</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">Options</b></span></code> on Windows and Linux and in the main menu (or by pressing Apple-Comma) for MacOSX.</p>
</div>
<div class="paragraph">
<p>If you cannot start the SDK, edit the file <code>config/Preferences/com/jme3/gde/core.properties</code> in the SDK settings folder (see above). If it doesn&#8217;t exist, create the file including all folders. Add the line <code>use_lwjgl_canvas=true</code>. To try OpenGL1 compatibility mode (works for both canvas settings) add <code>use_opengl_1=true</code>.</p>
</div>
</div>
<div class="sect3">
<h4 id="look-and-feel"><a class="anchor" href="#look-and-feel"></a>Look and Feel</h4>
<div class="paragraph">
<p>The <abbr title="Operating System">OS</abbr>-built-in look and feel might cause issues, you can change the LAF by using the appropriate command line switch (or add it to the [app folder]/etc/jmonkeyplatform.conf file, without the &#8220;- -&#8221; prefix).</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-none hljs">--laf javax.swing.plaf.nimbus.NimbusLookAndFeel</code></pre>
</div>
</div>
<div class="paragraph">
<p>or alternatively</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-none hljs">--laf javax.swing.plaf.metal.MetalLookAndFeel</code></pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="compiz"><a class="anchor" href="#compiz"></a>Compiz</h4>
<div class="paragraph">
<p>Compiz on Linux might cause issues, if you set its rendering quality to &#8220;Medium&#8221; these should go away.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code><span class="menuseq"><b class="menu">Appearance</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="submenu">Set Special effects to</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">&#8220;Medium&#8221;</b></span></code></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2">
<h3 id="updating-problems"><a class="anchor" href="#updating-problems"></a>Updating problems</h3>
<div class="paragraph">
<p>If you have problems updating the SDK, try deleting all files from <code>jmonkeyplatform/update/download</code> and/or <code>[settings folder]/update/download</code> depending on your system (see below for the settings folder location).</p>
</div>
<div class="paragraph">
<p>If you are on Linux, check if the user you run the SDK with has access to the files in <code>jmonkeyplatform/jdk/bin</code> and that they are executable.</p>
</div>
</div>
<div class="sect2">
<h3 id="freezing-performance-problems"><a class="anchor" href="#freezing-performance-problems"></a>Freezing / Performance problems</h3>
<div class="paragraph">
<p>If the SDK starts to become sluggish and / or slow or you get unexpected freezes of the application, you can try deleting the cache folder at var/cache in the settings folder (see below for the location of the settings folder). Do this while the SDK is not running, then restart the SDK.</p>
</div>
</div>
<div class="sect2">
<h3 id="preferences-and-settings"><a class="anchor" href="#preferences-and-settings"></a>Preferences and Settings</h3>
<div class="paragraph">
<p>To completely remove and/or reinstall the SDK it is vital that the settings folder is deleted too. The location can be seen through the &#8220;about&#8221; menu and is as following for the different <abbr title="Operating System">OS</abbr>'s:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Windows: <code>C:\Userspass\&lt;username&gt;\AppData\Roaming\.jmonkeyplatform</code></p>
</li>
<li>
<p>Windows (alt): <code>C:\Users\&lt;username&gt;\.jmonkeyplatform\</code></p>
</li>
<li>
<p>MacOSX: <code>/Users/&lt;username&gt;/Library/Application Support/jmonkeyplatform</code></p>
</li>
<li>
<p>Ubuntu:  <code>/home/&lt;username&gt;/.jmonkeyplatform</code></p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="log"><a class="anchor" href="#log"></a>Log</h3>
<div class="paragraph">
<p>To see or post the error output of the SDK in the forum, you can find the log of the application in the settings folder above too, the file is called <code>var/log/messages.log</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="getting-error-messages-and-reporting-issues"><a class="anchor" href="#getting-error-messages-and-reporting-issues"></a>Getting error messages and reporting issues</h3>
<div class="paragraph">
<p>When an exception happens in the SDK, a small warning sign appears in the lower right corner of the main window. Double-click it to open a window that allows you to see the exception stack trace. When posting about issues in the forum, always post the stack trace along with a description of what happens and how it can be reproduced.</p>
</div>
</div>
<div class="sect2">
<h3 id="specifying-the-jdk-location"><a class="anchor" href="#specifying-the-jdk-location"></a>Specifying the JDK location</h3>
<div class="paragraph">
<p>You can install another JDK for use with the jMonkey SDK. You then have to specify the location manually.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Go to your jMonkeyEngine SDK installation directory.<br>
Mac users right-click jMonkeyApplication.app (which actually is a directory) in the Finder and select &#8220;Show package contents&#8221;.</p>
</li>
<li>
<p>Navigate to the <code>etc</code> directory.<br>
Mac users navigate to <code>Contents/Resources/jmonkeyplatform/etc/</code>.</p>
</li>
<li>
<p>Open the file <code>jmonkeyplatform.conf</code> in a text editor.</p>
</li>
<li>
<p>Change the following line and enter the path to the JDK:</p>
</li>
</ol>
</div>
<div class="listingblock">
<div class="content">
<pre>jdkhome="/path/to/jdk"</pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="freezing-at-startup"><a class="anchor" href="#freezing-at-startup"></a>Freezing at startup</h3>
<div class="paragraph">
<p>If you&#8217;re behind a proxy or special network settings, try :</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Disable your network connection.</p>
</li>
<li>
<p>Launch jme sdk (may wait 30s/1min for timeout).</p>
</li>
<li>
<p>Go into <code><span class="menuseq"><b class="menu">Tools</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="submenu">Options</b>&#160;<i class="fa fa-angle-right caret"></i> <b class="menuitem">General</b></span></code>.</p>
</li>
<li>
<p>Setup &#8220;manual proxy settings&#8221; (for some reason the &#8220;Use System Proxy Settings&#8221; option doesn&#8217;t work on some Linux distributions)</p>
</li>
</ol>
</div>
<div class="paragraph">
<p><a href="https://hub.jmonkeyengine.org/t/jme-sdk-stalls-on-startup/30555">Discussion</a> of the problem.</p>
</div>
</div>
<div class="sect2">
<h3 id="known-issues"><a class="anchor" href="#known-issues"></a>Known Issues</h3>
<div class="paragraph">
<p>For a list of known issues and possible workarounds see the following link: <a href="https://github.com/jMonkeyEngine/sdk/issues">List of known issues on github.</a></p>
</div>
<div class="paragraph">
<p>Some issue are imported from the previous googlecode:
<a href="https://code.google.com/archive/p/jmonkeyengine/issues">List of old issues on googlecode.</a></p>
</div>
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