Applied to the getter method or the class field for the class's version property. If the annotation is applied directly to the class field, the corresponding getter and setter must be declared in the same class.
Alternately, the meta-annotation
DynamoDBVersioned may be used
to annotate a custom annotation, or directly to the field/getter.
Only nullable, integral numeric types (e.g. Integer, Long) can be used as
version properties. On a save() operation, the
attempt to increment the version property and assert that the service's value
matches the client's. New objects will be assigned a version of 1 when saved.
Note that for batchWrite, and by extension batchSave and batchDelete, no
version checks are performed, as required by the
public abstract String attributeName