Github user aledsage commented on the pull request:
https://github.com/apache/incubator-brooklyn/pull/397#issuecomment-67067270
Thanks @ahgittin - have changed it to:
// persistence could be null if deserializing state written by an old
version; in which case default to 'required'
return (persistence != null) ? persistence :
SensorPersistenceMode.REQUIRED;
And have added `@since 0.7.0` on new class / method in `AttributeSensor`.
Once jenkins confirms all ok, I'll merge.
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