Setting a mark using Vrapper is the same as in Vim. Press the
m key followed by a lowercase or uppercase letter.
There is a slight difference. If you use a lowercase letter, the mark is set as an invisible mark, like in Vim. However, if you use an uppercase letter, the mark is also set as an Eclipse bookmark. It even appears in the bar on the left as a visual bookmark. Bookmarks set this way can also be viewed by using the Bookmarks view.
Tried with: Vrapper 0.52.1, Eclipse 4.4.1 (Luna) and Ubuntu 14.04