Store binary data with Java driver

[Javier]

What is the correct way if storing binary data using Java driver?

If I put a byte[] in a DBObject, the data is encoded in the depecated
way (the one with subtype 2)
If I put a Binary with subtype 0, the data is encoded correctly but it
is decoded to a byte[] instead of a Binary.
If I put a Binary with user-defined subtype (80), the data is encoded
correctly and decoded to a Binary object.

The third one seems the way to go, but I'm not sure if setting user-
defined subtype for something that is general binary data is correct.
Any hints?

Many thanks

[Scott Hernandez]

What is wrong with just using a byte[] ? If you just want to store binary data that should work just fine.

The 2.6 driver will store with subtype 0 by default; which is the new standard across all drivers. Both subtype 0 and 2 will be returned as a byte[].

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[Javier]

The problem I see with using a byte[] is that it is encoded in the
deprecated way (subtype 2) that stores the data lenght twice, so there
is an overhead of 4 bytes per value.

[Scott Hernandez]

Yes, in the 2.6.x driver the default has changed (to subtype 0, without that overhead).