You are welcome to try out the new jME3, and contribute patches and features! This document shows how to download, set up, build, and run the latest development version from the sources. These instructions work in NetBeans IDE 8.x or better.

Prerequisites
  1. Have a GitHub account.

  2. Are a jMonkeyEngine project member.

If you are not a member, you fork the repository into your GitHub account and issue pull requests from there.

To fork the jMonkeyEngine repository into your GitHub Account:

  1. Navigate to https://github.com/jMonkeyEngine/jmonkeyengine.

  2. In the menu at the top of the page, select the Fork button.

In the following, always replace ~ with the path to your home directory.

Downloading the Sources

Clone the sources from the repository.

  1. In NetBeans, go to Team ▸ Git ▸ Clone.

    1. Repository URL:

      https://github.com/jMonkeyEngine/jmonkeyengine
      Use the URL to your repository fork and clone your fork if a non-member and you wish to contribute.
    2. You can leave user/pw blank for anonymous access unless you are going to push a commit.

    3. Specify Destination Folder.
      Local Folder: ~/NetBeansProjects]/jmonkeyengine

    4. Click Next.

  2. Select:

    • master*

      1. Click Next.

  3. Verify the auto-fill information in the Destination Directory dialog is correct.

    1. Optional:

      • Scan for NetBeans Projects after Clone

    2. Click Finish and wait.

After some time the download will end.

Information on Pull/Pushing Commits

You now have a local copy of the jmonkeyengine repository. There are a few rules you need to follow in order to contribute.

Members & Non-Members Pull/Push

Update your local copy and push commits by using the NetBeans command Git ▸ Remote ▸ Pull From Upstream or Git ▸ Remote ▸ Push To Upstream.

Non-Members

To update your fork on GitHub:

  1. Go to your version of the repository on GitHub.

  2. Click the New Pull Request button at the top.

  3. Note that the jMonkeyEngine repository will be on the left and your repository will be on the right.

  4. Click the Base Fork button and from the drop down menu select your forked repository.

  5. Select the “compare across forks” link.

  6. Click the Head Fork button and from the drop down list select “jMonkeyEngine/jmonkeyengine”.

  7. Click the green button Create pull request.

  8. Give a succinct and informative title, in the comment field give a short explanation of the changes and click the green button Create pull request again.

  9. Select the Commit And Merge button.

  10. Press the Commit And Merge button again to confirm your choice.

To submit changes to the jMonkeyEngine repository after pushing them to your fork:

  1. Go to your version of the repository on GitHub.

  2. Click the New Pull Request button at the top.

  3. Note that the jMonkeyEngine repository will be on the left and your repository will be on the right.

  4. Click the green button Create pull request. Give a succinct and informative title, in the comment field give a short explanation of the changes and click the green button Create pull request again.

Everyone
See How to contribute to jMonkeyEngine before submitting a P/R.

Verify Cloned Subprojects

Look into the Subprojects node and confirm that the subprojects cloned:

  • jme3-android

  • jme3-android-native

  • jme3-blender

  • jme3-bullet

  • jme3-bullet-native

  • jme3-bullet-native-android

  • jme3-core

  • jme3-desktop

  • jme3-effects

  • jme3-examples

  • jme3-ios

  • jme3-jbullet

  • jme3-jogg

  • jme3-jogl

  • jme3-lwjgl

  • jme3-lwjgl3

  • jme3-networking

  • jme3-niftygui

  • jme3-plugins

  • jme3-terrain

  • jme3-testdata

  • jme3-vr

For a detailed description of the separate jar files see this list.

Build the Project and Run a Sample App

When you build the engine from the root node, part of the build process includes building the header files for the jme3-bullet-native subproject. This updates the timestamp on the header files, even though you did not edit them. This will then mark them as modified, which will add them to your next commit.

To prevent them from being commited, before you do anything else:

  1. In the Projects window, open the jme3-bullet-native subproject node.

  2. Navigate to the Source Packages/<default package> folder.

  3. Select all .h header files to highlight them.

  4. RMB select the highlighted files then choose Git ▸ Ignore ▸ Exclude From Commit

  1. RMB select the jmonkeyengine project root node and Clean and Build the project.

  2. In the Projects window, RMB select and then open the jme-examples node which contains the sample apps. You do this for any subproject you wish to make changes to.

  3. Every file in the Source Packages folder with a Main class (for example jme3test.model/TestHoverTank.java or jme3test.games/CubeField.java) is an app.

  4. Right-click a sample app and choose “Run File” (Shift-F6).

  5. Generally in sample apps:

    1. the mouse and the WASD keys control movement

    2. the Esc key exits the application

You can RMB select the jme-examples node and select Run to start the Test Chooser app whether or not you open the project node.

Optional: Javadoc Popups and Source Navigation in NetBeans

If you are working on the jmonkeyengine sources:

  1. Confirm in the Files window that the javadoc has been created in ~/NetBeansProjects/jmonkeyengine/dist/javadoc

  2. In the editor, place the caret in a jme class and press ctrl-space to view javadoc.

If you are working on a game project that depends on jmonkeyengine:

  1. In the jmonkeyengine source:

    1. RMB selecting a subproject node and choosing Tasks ▸ install will install the built jars for that subproject 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.

    2. RMB selecting the root node and choosing Tasks ▸ dist creates a jME3 examples distribution with all jme3 binaries, javadoc and external libraries under ~/NetBeansProjects/jmonkeyengine/dist.

    3. RMB selecting the root node and choosing Tasks ▸ libDist builds and copies the engine binaries and sources to ~/NetBeansProjects/jmonkeyengine/build/libDist.

    4. RMB selecting the root node and choosing Tasks ▸ copyLib copies the engine dependencies to ~/NetBeansProjects/jmonkeyengine/build/libDist/lib-ext.

  2. In your game project, add the jme3 jar by RMB selecting the Libraries node and selecting Add Jar/Folder.

  3. Navigate to the folder of choice and select the library jar you’re interested in. Check “as relative path” and click Open .

  4. RMB select the newly added jar and choose “Edit”.

  5. In the Edit Jar Reference dialog, JavaDoc: Browse to the javadoc/ folder of choice. Check “as relative path” and click Open .

  6. In the Edit Jar Reference dialog, Sources: Browse to the folder of choice that contains your sources. Check “as relative path” and click Open.

  7. In the editor, place the caret in a jme class and press ctrl-space to view javadoc. Ctrl-click any jme3 method to jump to its definition in the sources.

This tip works for any third-party JAR library that you use. (You may have to download the javadoc/sources from their home page separately).