scala/scala — pull request #3839 by Ichoran (2014-06-28 00:16:14+00:00)
Title: SI-7115  JMapWrapper.get can incorrectly return Some(null)

This isn't actually a bug. Trying to use a single-threaded interface in a concurrent context is supposed to break in various unpleasant ways.

Documentation has been added to encourage one to avoid wrapping a concurrent map in the generic wrapper (which assumes a single thread).