Register the "hydrated" state of an entity instance, after the first step of 2-phase loading.
Add the "hydrated state" (an array) of an uninitialized entity to the session. We don't try
to resolve any associations yet, because there might be other entities waiting to be
read from the JDBC result set we are currently processing
Perform the second step of 2-phase load. Fully initialize the entity
After processing a JDBC result set, we "resolve" all the associations
between the entities which were instantiated and had their state
"hydrated" into an array
PostLoad cannot occur during initializeEntity, as that call occurs *before*
the Set collections are added to the persistence context by Loader.
Without the split, LazyInitializationExceptions can occur in the Entity's
postLoad if it acts upon the collection.
Add an uninitialized instance of an entity class, as a placeholder to ensure object
identity. Must be called before postHydrate().
Create a "temporary" entry for a newly instantiated entity. The entity is uninitialized,
but we need the mapping from id to instance in order to guarantee uniqueness.