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<article class="doc">
<h1 class="page">Starting a JME3 application from the command-line</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Although we recommend the jMonkeyEngine <a href="../sdk.html" class="page">SDK</a> for developing JME3 games, you can use any IDE (integrated development environment) such as <a href="setting_up_netbeans_and_jme3.html" class="page">NetBeans</a> or <a href="setting_up_jme3_in_eclipse.html" class="page">Eclipse</a>, and even work freely from the command-line. Here is a generic IDE-independent &#8220;getting started&#8221; tutorial.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="installing-the-jme3-framework"><a class="anchor" href="#installing-the-jme3-framework"></a>Installing the JME3 Framework</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There are many ways to install the JME framework from the command-line, but for this tutorial we will narrow it down to two, the easy way and the hard way.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="installing-with-git-easy-way"><a class="anchor" href="#installing-with-git-easy-way"></a>Installing with Git (easy way)</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can build JME3 from the sources. (Recommended for JME3 developers.) This example expects <a href="https://help.github.com/articles/set-up-git/">Git</a> to be installed on your system.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>mkdir jme3
cd jme3

// if you have a rsa key configured
git clone [email protected]:jMonkeyEngine/jmonkeyengine.git
// or
// if you don't, but you'll be asked for credential after the next command
git clone https://github.com/jMonkeyEngine/jmonkeyengine.git
//can take a while

// build the engine and install it in your local maven repo.
./gradlew install</code></pre>
</div>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
What is an <a href="https://help.github.com/articles/adding-a-new-ssh-key-to-your-github-account/">RSA key</a>?
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The install command will install the built jars into your local maven repositories org.jmonkeyengine folder, which on Linux is ~/.m2, and on Windows might be in AppData, or in your home directory.</p>
</div>
<div class="paragraph">
<p>To use the engine in a game project, you can use <a href="https://hub.jmonkeyengine.org/t/bootmonkey-bootstrap-your-jme-project/37141">BootMonkey</a> or clone a template project from GitHub.</p>
</div>
<div class="paragraph">
<p>To use the template, first create a folder for your project:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>cd ..
mkdir HelloJME3
cd HelloJME3</code></pre>
</div>
</div>
<div class="paragraph">
<p>Next, clone one of these templates:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/Simsilica/Examples/tree/master/simple-jme">Simsilica/Examples</a></p>
</li>
<li>
<p><a href="https://github.com/Nehon/base-jme">Nehon/base-jme</a></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>After cloning, open the <code>build.gradle</code> file and uncomment the <code>mavenLocal()</code> repository, change the version variable, and uncomment any dependencies you will need:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>repositories {
    //This is where jme3 dependencies are stored.
    jcenter()

    //Uncomment this if you install local dependencies.
    mavenLocal()

    //Uncomment this if you use external dependencies
    //mavenCentral()

    //Uncomment this if you use jme3-niftygui
    //maven{url 'http://nifty-gui.sourceforge.net/nifty-maven-repo'}

}

ext.jmeVersion = "[3.2,)"

...

dependencies {

    compile "org.jmonkeyengine:jme3-core:$jmeVersion"
    compile "org.jmonkeyengine:jme3-desktop:$jmeVersion"
    compile "org.jmonkeyengine:jme3-lwjgl:$jmeVersion"

    //Those are jme3 additional library uncomment the ones you need
    //compile "org.jmonkeyengine:jme3-android-native:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-android:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-bullet-native-android:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-blender:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-bullet-native:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-bullet:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-effects:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-jogg:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-jogl:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-lwjgl3:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-networking:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-plugins:$jmeVersion"
    //compile "org.jmonkeyengine:jme3-terrain:$jmeVersion"

    //You need to uncomment nifty repository in the repositories section if you use this dependency
    //compile "org.jmonkeyengine:jme3-niftygui:$jmeVersion"

    runtime project(':assets')
}
...</code></pre>
</div>
</div>
<div class="paragraph">
<p>For a detailed description of the separate jar files see <a href="jme3_source_structure.html#structure_of_jmonkeyengine3_jars" class="page">this list</a>.</p>
</div>
<div class="paragraph">
<p>That&#8217;s it, you&#8217;re done. After the clone, you will have a project that contains a source package with a default blue cube JME3 app and a subproject that has the proper asset directory structure for your assets.</p>
</div>
<div class="paragraph">
<p>Build and run your project and you should see a blue cube.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="manual-download-hard-way"><a class="anchor" href="#manual-download-hard-way"></a>Manual Download (hard way)</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This example shows how to set up and run a simple application (HelloJME3) that depends on the jMonkeyEngine3 libraries.</p>
</div>
<div class="paragraph">
<p>The directory structure will look as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>jme3/
jme3/lib
jme3/src
...
HelloJME3/
HelloJME3/lib
HelloJME3/assets
HelloJME3/src
...</code></pre>
</div>
</div>
<div class="paragraph">
<p>To install the development version of jme3, download the latest  <a href="https://github.com/jMonkeyEngine/jmonkeyengine/releases">stable release</a>, unzip the folder into a directory named <code>jme3</code>. The filenames here are just an example, but they will always be something like <code>jME3.x-stable</code>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>mkdir jme3
cd jme3
unzip jME3.2-stable.zip
cd ..</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="sample-project-directory-structure"><a class="anchor" href="#sample-project-directory-structure"></a>Sample Project Directory Structure</h2>
<div class="sectionbody">
<div class="paragraph">
<p>First we set up the directory and source package structure for your game project. Note that the game project directory <code>HelloJME3</code> is on the same level as your <code>jme3</code> folder. In this example, we create a Java package that we call <code>mygame</code> in the source directory.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>mkdir HelloJME3
mkdir HelloJME3/src
mkdir HelloJME3/src/mygame</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="libraries"><a class="anchor" href="#libraries"></a>Libraries</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Next you copy the necessary JAR libraries from the download to your project. You only have to do this set of steps once every time you download a new JME3 build. For a detailed description of the separate jar files see <a href="jme3_source_structure.html#structure_of_jmonkeyengine3_jars" class="page">this list</a>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>mkdir HelloJME3/build
mkdir HelloJME3/lib
cp jme3/lib/*.* HelloJME3/lib</code></pre>
</div>
</div>
<div class="sect2">
<h3 id="sample-code"><a class="anchor" href="#sample-code"></a>Sample Code</h3>
<div class="paragraph">
<p>To test your setup, create the file <code>HelloJME3/src/mygame/HelloJME3.java</code> with any text editor, paste the following sample code, and save.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">package mygame;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;
import com.jme3.math.ColorRGBA;

public class HelloJME3 extends SimpleApplication {

    public static void main(String[] args){
        HelloJME3 app = new HelloJME3();
        app.start();
    }

    @Override
    public void simpleInitApp() {
        Box b = new Box(Vector3f.ZERO, 1, 1, 1);
        Geometry geom = new Geometry("Box", b);
        Material mat = new Material(assetManager,
          "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Blue);
        geom.setMaterial(mat);
        rootNode.attachChild(geom);
    }
}</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="build-and-run"><a class="anchor" href="#build-and-run"></a>Build and Run</h2>
<div class="sectionbody">
<div class="paragraph">
<p>We build the sample application into the build directory…</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>cd HelloJME3
javac -d build -cp "lib/eventbus.jar:lib/j-ogg-all.jar:lib/jme3-lwjgl.jar:lib/jme3-bullet.jar:lib/jinput.jar:lib/lwjgl.jar:lib/stack-alloc.jar:lib/vecmath.jar:lib/xpp3.jar:lib/jme3-blender.jar:lib/jme3-core.jar:lib/jme3-desktop.jar:lib/jme3-jogg.jar:lib/jme3-plugins.jar:lib/jme3-terrain.jar:lib/jme3-testdata.jar:lib/jme3-niftygui.jar:lib/nifty-default-controls.jar:lib/nifty-examples.jar:lib/nifty-style-black.jar:lib/nifty.jar:." src/mygame/HelloJME3.java</code></pre>
</div>
</div>
<div class="paragraph">
<p>… and run it.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>cd build
java -cp "../lib/eventbus.jar:../lib/j-ogg-all.jar:../lib/jme3-lwjgl.jar:../lib/jme3-bullet.jar:../lib/jinput.jar:../lib/lwjgl.jar:../lib/stack-alloc.jar:../lib/vecmath.jar:../lib/xpp3.jar:../lib/jme3-blender.jar:../lib/jme3-core.jar:../lib/jme3-desktop.jar:../lib/jme3-jogg.jar:../lib/jme3-plugins.jar:../lib/jme3-terrain.jar:../lib/jme3-testdata.jar:../lib/jme3-niftygui.jar:../lib/nifty-default-controls.jar:../lib/nifty-examples.jar:../lib/nifty-style-black.jar:../lib/nifty.jar:." mygame/HelloJME3</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
If you use Windows, the classpath separator is <kbd>\</kbd>  instead of <kbd>/</kbd>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>If a settings dialog pops up, confirm the default settings. You should now see a simple window with a 3-D cube. Use the mouse and the WASD keys to move. It works!</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="recommended-asset-directory-structure"><a class="anchor" href="#recommended-asset-directory-structure"></a>Recommended Asset Directory Structure</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For <a href="intermediate/multi-media_asset_pipeline.html" class="page">multi-media files, models, and other assets</a>, we recommend creating the following project structure:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>cd HelloJME3
mkdir assets
mkdir assets/Interface
mkdir assets/Materials
mkdir assets/MatDefs
mkdir assets/Models
mkdir assets/Scenes
mkdir assets/Shaders
mkdir assets/Sounds
mkdir assets/Textures</code></pre>
</div>
</div>
<div class="paragraph">
<p>This directory structure will allow <a href="intermediate/simpleapplication.html" class="page">SimpleApplication</a>'s default <a href="advanced/asset_manager.html" class="page">AssetManager</a> to load media files from your <code>assets</code> directory, like in this example:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code>import com.jme3.scene.Spatial;
...
  Spatial elephant = assetManager.loadModel("Models/Elephant/Elephant.meshxml");
  rootNode.attachChild(elephant);
...</code></pre>
</div>
</div>
<div class="paragraph">
<p>You will learn more about the asset manager and how to customize it later. For now feel free to structure your assets (images, textures, models) into further sub-directories, like in this example the <code>assets/models/Elephant</code> directory that contains the <code>elephant.mesh.xml</code> model and its materials.</p>
</div>
</div>
</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>Now follow the <a href="../jme3.html" class="page">tutorials</a> and write your first jMonkeyEngine game.</p>
</div>
</div>
</div>
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