FindBugs says:
Adding elements of an entry set may fail due to reuse of Map.Entry
object.
The entrySet() method is allowed to return a view of the underlying
Map in which a single Entry object is reused and returned during the
iteration. As of Java 1.6, both IdentityHashMap and EnumMap did so.
When iterating through such a Map, the Entry value is only valid
until you advance to the next iteration. If, for example, you try to
pass such an entrySet to an addAll method, things will go badly wrong.
Instead of using addAll, explicitly add each entry by iterating over
the map.
Change-Id: I0468060f67c63c877469ec565eb594b960c52c89
076e6a36cc