Answer Posted / jigs

A package is introduced as an addition to an existing JRE,
it comes in as javax. If it's first introduced as part of a
JRE (like NIO was, I believe) then it comes in as java. Not
sure why the new date and time API will end up as javax
following this logic though... unless it will also be
available separately as a library to work with earlier
versions (which would be useful).
A classloaders are set up to only allow classes within
java.* to be loaded from rt.jar or something similar.
(There's certainly a check in ClassLoader.preDefineClass.)

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