basho/riak-java-client — pull request #168 by broach (2012-09-24 14:50:54+00:00)
Title: Allow store operation with null key

Because you can now store without triggering the implicit fetch
using the StorObject.withoutFetch() method, allowing a store
will a null key and having Riak generate the key is now possible.
A fetch with a null key (or a store without specifying withoutFetch())
will still throw an illegal argument exception.

Fixes #141