Javadoc
Set a meta property value on a specific entity, setting a value to null will remove the related
value from persistence, passing the name and value as null will remove all the properties for
this entity from persistence
Note: Do not use this as a substitute for storing
core meta data on your actual persistent entities, this is meant to provide for the case where
runtime properties need to be added to an entity, persisted, and later retrieved and should be
seen as a lazy way to expand the fields of a persistent entity