While working on 6942989, I happened to notice that the first sentence
of the LogManager spec is:

    There is a single global LogManager object that is used to
    maintain a set of shared state about Loggers and log services.

Here is a pointer to the current API spec for LogManager:

http://java.sun.com/javase/6/docs/api/java/util/logging/LogManager.html

The singleton nature of the LogManager is not enforced, but it
should be in order to avoid confusion.