A bug I've noticed and haven't been able to figure out: in OS X 10.5, when DrJava is the active application, I can't launch "System Preferences" and "Software Update" from the Apple menu. These apps will attempt to open and immediately crash. I don't see this behavior when launching the apps in any other way, including from the Apple menu of NetBeans or a simple Java app built in XCode.
The log messages from the crashing app:
3/5/08 10:04:09 AM System Preferences[16234] No Info.plist file in application bundle or no NSPrincipalClass in the Info.plist file, exiting
3/5/08 10:04:09 AM com.apple.launchd[108] ([0x0-0x4e24e2].com.apple.systempreferences[16234]) Exited with exit code: 1
Logged In: YES
user_id=1075744
Originator: NO
I don't have 10.5, but on my 10.4 system it does not occur.