Choosing a "different one" is actually a pretty easy solution.
I had been running Eclipse as an administrator (sudo eclipse
from the command line) because the "workspace" folder was throwing the Workspace in use or cannot be created…
error (and running as administrator seemed to be the only solution that fixed it).
A coworker (working on this same issue with me) wanted to run Eclipse by clicking on an icon. So when he ran Eclipse, and the dialogue box came up with the choose your workspace, he just added a "2" to the end of "workspace".
This created a new folder: "workspace2". Eclipse ran fine with that; and I haven’t had any of the locking problems since.