bazaarvoice/jolt — pull request #61 by milosimpson (2013-11-14 00:17:20+00:00)
Title: Prevent Sortr from throwing UnsupportedOperationException 

When "sorting" an Immutable / Unmodifiable List.

Note, we are not "sorting" the list, as that would change the semantics of the list, but instead making a sorted copy of each element.