It's possible for multiple copies of Java Updater.app to be started at the same time. This is bad, because Sparkle doesn't know if other instances of the app are running, and both will attempt to update at the same time. At the very least it will fail, and at the worst it can lead to a corrupted update.
1. Install the 7u6 runtime, build 372 or later from <http://rehudson.us.oracle.com:8080/hudson/job/jdk-2-build-mac-universal-deploy/>. Ensure you are connected to Oracle's network so the update attempt will happen.
2. Launch the Java Control Panel. Use either System Preferences or the command line:
3. Start Safari and load any page with an applet.
---> Two instances of Java Updater appear in the dock.
Expected: Only one instance running at a time.