Tag Archives: os x

OS X Java 6 update 5: how to reconnect the source…

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With each update of Java on OS X, Apple nukes all the things you have done to ensure a proper ability to peruse the JDK source files. Which is a pita being a Java developer. How do you get the source again in your IDE (in my case Eclipse Indigo):

  • Download and install the javadeveloper_for_mac_os_x_10.6__10m3425.dmg from developer.apple.com (free registration required)
  • Install the client update (comes from the automatic update functionality in OS X), it doesn’t matter in which order you do these two steps)

Next run the following commands in a terminal:

cd /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
sudo ln -s /Library/Java/JavaVirtualMachines/1.6.0_26-b03-384.jdk/Contents/Home/src.jar
sudo ln -s /Library/Java/JavaVirtualMachines/1.6.0_26-b03-384.jdk/Contents/Home/docs.jar

Eclipse will now be able to find the sources for the Java classes.

If you have problems finding the OS X Java developer downloads:

  • Go to: Resources
  • Click on “developer downloads”
  • Click on “Java” in the right side menu

Apple made it impossible to provide a direct link, so you’ll have to navigate the developer website yourself.

(updated with navigation to Java downloads)

Eclipse 3.4 with openjdk 6 on OS X 32-bit CoreDuo

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With the invaluable help of David Green, I was able to run Eclipse on openjdk 6 on my first gen MacBook Pro (you know, those left behind by Apple, running on a 32 bit CoreDuo processor… good to know that Apple supports the early adapters).

With this script that I adapted from David’s blog I was able to start Eclipse 3.4 (Version: 3.4.2
Build id: M20090211-1700) with Landon Fullers openjdk 6 build:

export JAVA_HOME=/Developer/Java/openjdk6-b16-24_apr_2009-r1
export PATH=$JAVA_HOME/bin:$PATH

java -server -Djava.library.path=$HOME/bin/jnilib -Dswt.library.path=$HOME/bin/jnilib -Xms128m -Xmx768m \
    -XX:MaxPermSize=192m -Dosgi.requiredJavaVersion=1.5 -Dorg.eclipse.swt.internal.carbon.smallFonts \
    -cp /Applications/eclipse/Eclipse.app/Contents/MacOS/../../../plugins/org.eclipse.equinox.launcher_1.0.101.R34x_v20081125.jar \
    org.eclipse.equinox.launcher.Main -os macosx -ws carbon -arch x86 -showsplash \
    -launcher /Applications/eclipse/Eclipse.app/Contents/MacOS/eclipse -name Eclipse \
    --launcher.library /Applications/eclipse/Eclipse.app/Contents/MacOS/../../../plugins/org.eclipse.equinox.launcher.carbon.macosx_1.0.101.R34x_v20080731 \
    -startup /Applications/eclipse/Eclipse.app/Contents/MacOS/../../../plugins/org.eclipse.equinox.launcher_1.0.101.R34x_v20081125.jar \
    -launcher /Applications/eclipse/Eclipse.app/Contents/MacOS/eclipse \
    -keyring $HOME.eclipse_keyring -consoleLog -showlocation -vm $JAVA_HOME

The script misses the shebang, since my hosting provider thinks that I’m trying to execute some serverside exploit…
You’ll have to extract a couple of shared libraries that are packaged in your Eclipse distribution:

jar xfv /Applications/eclipse/plugins/org.eclipse.swt.carbon.macosx_3.4.1.v3452b.jar
jar xfv /Applications/eclipse/plugins/org.eclipse.core.filesystem.macosx_*.jar os/macosx/liblocalfile_1_0_0.jnilib

You’ll have to rename all those libraries to give them a *.dylib extension.

Finally I had to point /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home to the openjdk 6 directory:

sudo mv /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home.old
sudo ln -s LOCATION_OF_OPENJDK /System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home

Downloading the internet with Maven in a new light

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I have my share of complaints like everybody else about Apache Maven and one of them is that upon installation (or upgrading to a new plugin version) it starts downloading half of the available internet. Maven is constructed in a highly modular fashion, requiring lots of different, small, focused Java libraries. I’d like the distribution to contain those libraries, but I digress. Tonight I saw that not only Maven is structured this way. It is something *all* open source projects got.

For example, the much touted Ruby on Rails project with their disdain for everything Java would probably cringe at Maven (it uses XML after all). But installing Ruby on Rails and for example Radiant CMS with some plugins is a futile attempt in finding the right invocations of: script/*, rake, gem, port and other commandline tools you’ll want to get familiar with. All these tools start downloading stuff from the internet from different repositories (SVN, ruby forge, etc).

Maven: you’re not alone anymore in downloading the internet for your builds…

Eclipse + OS X = unhappy

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Eclipse and OS X (10.4 Tiger) makes me unhappy. Today I witnessed something really stupid. I have allocated 768MB for Eclipse (eclipse.ini) and to my amazement, Eclipse was beach balling (being unresponsive for you non-OS X-ers). This beach balling was due to the simple fact that the Java garbage collector was reading in pages from the swap file in order to throw everything away. Woohoo! This took of course over 2 minutes.

I doubt that Java will ever become a consumer technology with this kind of shit.