Unable to Install Aptana Studio 3 Plugin for Eclipse

Problems:

Installation of Aptana Studio 3 Plugin for Eclipse (Indigo) stuck at 49%.

Difficulty installing Eclipse plugins, with error message "Comparison method violates its general contract!".

Solution:
Uninstall Java 7
Install Java 6 Update 27

Additional Notes:

There is mention in the references below of entering the following in eclipse.ini:
-Djava.util.Arrays.useLegacyMergeSort=true

Unfortunately, I was not able to get this particular solution to work. It would allow you to keep Java 7 installed, and is worth further investigation if uninstalling Java 7 is not an option.

References:

1. Eclipse Bugs - Bug 317785
2. Java.net - Comparison method violates its general contract!