Mac has no Java 6. The Java 6 beta that Apple released is only 64-bit, which is no good for running Eclipse. Not only is this a major annoyance, it is a problem for developers that need to profile and take heap dumps of their applications.
Some time ago I found this post by Landon Fuller which supposedly launches Eclipse on SoyLatte. While I believe that Landon is a genius, it did not work for me. Well lately I've needed to take some heap dumps, so I tried again.
Here's what worked for me:
/Users/dgreen/Documents/java/soylatte16-i386-1.0.2/bin/java -server -Xms128m -Xmx1536m -XX:MaxPermSize=256m -Dosgi.requiredJavaVersion=1.5 -Dorg.eclipse.swt.internal.carbon.smallFonts -Djava.library.path=/Users/dgreen/bin/jnilib -cp /Applications/eclipse/Eclipse.app/Contents/MacOS/../../../plugins/org.eclipse.equinox.launcher_1.0.100.v20080509-1800.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_1.0.100.v20080509-1800/eclipse_1114.so -startup /Applications/eclipse/Eclipse.app/Contents/MacOS/../../../plugins/org.eclipse.equinox.launcher_1.0.100.v20080509-1800.jar -data /Users/dgreen/Documents/workspace -launcher /Applications/eclipse/Eclipse.app/Contents/MacOS/eclipse -keyring /Users/dgreen/.eclipse_keyring -consoleLog -showlocation -vm /Users/dgreen/Documents/java/soylatte16-i386-1.0.2
I also had to extract all *.jnilib files from eclipse/plugins/org.eclipse.swt.carbon.macosx_3.4*.jar and copy them into /Users/dgreen/bin/jnilib
Finally, Eclipse running in a Java 6 VM on a Mac! Apple, time to get your Java act in gear.
Update 2008-08-21: SoyLatte 1.0.2 works for me, but 1.0.3 and OpenJDK 7 darwin packages posted here don't. If you find a solution, please let me know!
Update 2009-05-11: See this related article Eclipse 3.5 (Galileo) on Java 7
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