Goals

Minimum requirements to run

Prerequisites to build

If you install Xcode after installing the Apple provided Java for Mac OS X, you will have to re-install the same Java for Mac OS X or a later developer preview to correct headers in the JavaRuntimeSupport framework.

1. Get the code

hg clone http://hg.openjdk.java.net/macosx-port/macosx-port
cd macosx-port
chmod 755 get_source.sh
./get_source.sh

2. Build

make ALLOW_DOWNLOADS=true SA_APPLE_BOOT_JAVA=true ALWAYS_PASS_TEST_GAMMA=true ALT_BOOTDIR=`/usr/libexec/java_home -v 1.6` HOTSPOT_BUILD_JOBS=`sysctl -n hw.ncpu`

3. Smoke Test

build/macosx-universal/j2sdk-bundle/1.7.0.jdk/Contents/Home/bin/java -version

4. Install

mkdir -p ~/Library/Java/JavaVirtualMachines
cp -R build/macosx-universal/j2sdk-bundle/1.7.0.jdk ~/Library/Java/JavaVirtualMachines

5. Run

export JAVA_HOME=`/usr/libexec/java_home --version 1.7`
$JAVA_HOME/bin/java -version
$JAVA_HOME/bin/java -jar /Developer/Extras/Java/JFC/SwingSet2/SwingSet2.jar

On Mac OS X 10.7 use the alternate location for the SwingSet2.jar if you have the Java Developer Package installed.

$JAVA_HOME/bin/java -jar /Library/Java/Demos/JFC/SwingSet2/SwingSet2.jar

6. Test

Download jtreg to run the tests in the /jdk/test directory.

Bugs!

File them at java.net/jira/browse/MACOSX_PORT. Please check out the bug reporting guidelines if you haven't filed against the project before.

Questions?

Please join the macosx-port-dev mailing list and ask away!

TL;DR

  1. Download an unofficial build
  2. Open /Applications/Utilities/Java Preferences.app
  3. Drag both "OpenJDK 7" entries to the top of the list
  4. Run "java -version" in /Applications/Utilities/Terminal.app