I\'m using MacOsX 10.6.4.
Some time ago I run into problems with Eclipse (it wouldn\'t start anymore - I opened a question here and followed all the suggestion but w
Some things to try:
Look for adventitious xerces JARs that may have been inadvertently left in one of the directories of the System property java.ext.dirs.
/Users/*/Library/Java/Extensions /Library/Java/Extensions /System/Library/Java/Extensions /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/lib/ext
Use spotlight to search for extraneous xerces JARs outside of Eclipse.
Remove /Applications/eclipse and ~/.eclipse; reinstall Eclipse.
Reinstall Java from the the installer DVD: /Volumes/Mac OS X Install DVD/Optional Installs/Xcode Tools/Packages/JavaSDK.pkg.
Check Software update.