JOB key maps are specialized persistent maps extending interface JobMap . They inherit persistence from JOB maps changing key semantics. JOB key maps are used for datastore identity.
In contrast to JOB maps, key maps generate key values.
For this reason, method put only has one argument:
JobKey put(Object value)
The return value is the key created by this method. You cannot pass other instances as key arguments to key map methods.