Github user mike-tutkowski commented on the pull request:
https://github.com/apache/cloudstack/pull/1403#issuecomment-208120039
@jburwell Unfortunately Google's ImmutableMap doesn't support null for a
value (which we use). I noticed this while running regression tests and googled
to see if there is a way around it. Google suggested using an unmodifiableMap,
but it doesn't provide the same benefits (we wouldn't be making a copying of
the underlying data). It does allow you to provide back to callers a read-only
implementation, though.
I could allows iterate over the passed-in list and only add to the
ImmutableMap entries that don't have null for a value. Not super elegant, but
it would work.
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