public static  void addUninitializedCachedEntity(EntityKey key,
    Object object,
    EntityPersister persister,
    LockMode lockMode,
    boolean lazyPropertiesAreUnfetched,
    Object version,
    SessionImplementor session) 
{
		session.getPersistenceContext().addEntity(
				object, 
				Status.LOADING, 
				null, 
				key, 
				version, 
				lockMode, 
				true, 
				persister, 
				false, 
				lazyPropertiesAreUnfetched
			);
}

 public static  void addUninitializedEntity(EntityKey key,
    Object object,
    EntityPersister persister,
    LockMode lockMode,
    boolean lazyPropertiesAreUnfetched,
    SessionImplementor session) 
{
		session.getPersistenceContext().addEntity(
				object, 
				Status.LOADING, 
				null, 
				key, 
				null, 
				lockMode, 
				true, 
				persister, 
				false, 
				lazyPropertiesAreUnfetched
			);
}

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.

 public static  void initializeEntity(Object entity,
    boolean readOnly,
    SessionImplementor session,
    PreLoadEvent preLoadEvent,
    PostLoadEvent postLoadEvent) throws HibernateException 
{
		
		//TODO: Should this be an InitializeEntityEventListener??? (watch out for performance!)
		final PersistenceContext persistenceContext = session.getPersistenceContext();
		EntityEntry entityEntry = persistenceContext.getEntry(entity);
		if ( entityEntry == null ) {
			throw new AssertionFailure( "possible non-threadsafe access to the session" );
		}
		EntityPersister persister = entityEntry.getPersister();
		Serializable id = entityEntry.getId();
		Object[] hydratedState = entityEntry.getLoadedState();
		if ( log.isDebugEnabled() )
			log.debug(
					"resolving associations for " +
					MessageHelper.infoString(persister, id, session.getFactory())
				);
		Type[] types = persister.getPropertyTypes();
		for ( int i = 0; i <  hydratedState.length; i++ ) {
			final Object value = hydratedState[i];
			if ( value!=LazyPropertyInitializer.UNFETCHED_PROPERTY && value!=BackrefPropertyAccessor.UNKNOWN ) {
				hydratedState[i] = types[i].resolve( value, session, entity );
			}
		}
		//Must occur after resolving identifiers!
		if ( session.isEventSource() ) {
			preLoadEvent.setEntity(entity).setState(hydratedState).setId(id).setPersister(persister);
			PreLoadEventListener[] listeners = session.getListeners().getPreLoadEventListeners();
			for ( int i = 0; i <  listeners.length; i++ ) {
				listeners[i].onPreLoad(preLoadEvent);
			}
		}
		persister.setPropertyValues( entity, hydratedState, session.getEntityMode() );
		final SessionFactoryImplementor factory = session.getFactory();
		if ( persister.hasCache() && session.getCacheMode().isPutEnabled() ) {
			if ( log.isDebugEnabled() )
				log.debug(
						"adding entity to second-level cache: " +
						MessageHelper.infoString( persister, id, session.getFactory() )
					);
			Object version = Versioning.getVersion(hydratedState, persister);
			CacheEntry entry = new CacheEntry(
					hydratedState, 
					persister, 
					entityEntry.isLoadedWithLazyPropertiesUnfetched(), 
					version, 
					session, 
					entity
			);
			CacheKey cacheKey = new CacheKey( 
					id, 
					persister.getIdentifierType(), 
					persister.getRootEntityName(), 
					session.getEntityMode(), 
					session.getFactory() 
			);
			boolean put = persister.getCacheAccessStrategy().putFromLoad(
					cacheKey,
					persister.getCacheEntryStructure().structure( entry ),
					session.getTimestamp(),
					version,
					useMinimalPuts( session, entityEntry )
			);
			if ( put && factory.getStatistics().isStatisticsEnabled() ) {
				factory.getStatisticsImplementor().secondLevelCachePut( persister.getCacheAccessStrategy().getRegion().getName() );
			}
		}
		if ( readOnly || !persister.isMutable() ) {
			//no need to take a snapshot - this is a 
			//performance optimization, but not really
			//important, except for entities with huge 
			//mutable property values
			persistenceContext.setEntryStatus(entityEntry, Status.READ_ONLY);
		}
		else {
			//take a snapshot
			TypeFactory.deepCopy( 
					hydratedState, 
					persister.getPropertyTypes(), 
					persister.getPropertyUpdateability(), 
					hydratedState,  //after setting values to object, entityMode
					session
				);
			persistenceContext.setEntryStatus(entityEntry, Status.MANAGED);
		}
		persister.afterInitialize(
				entity, 
				entityEntry.isLoadedWithLazyPropertiesUnfetched(), 
				session
			);
		if ( session.isEventSource() ) {
			postLoadEvent.setEntity(entity).setId(id).setPersister(persister);
			PostLoadEventListener[] listeners = session.getListeners().getPostLoadEventListeners();
			for ( int i = 0; i <  listeners.length; i++ ) {
				listeners[i].onPostLoad(postLoadEvent);
			}
		}
		if ( log.isDebugEnabled() )
			log.debug(
					"done materializing entity " +
					MessageHelper.infoString( persister, id, session.getFactory() )
				);
		if ( factory.getStatistics().isStatisticsEnabled() ) {
			factory.getStatisticsImplementor().loadEntity( persister.getEntityName() );
		}
}

Perform the second step of 2-phase load. Fully initialize the entity instance. 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

 public static  void postHydrate(EntityPersister persister,
    Serializable id,
    Object[] values,
    Object rowId,
    Object object,
    LockMode lockMode,
    boolean lazyPropertiesAreUnfetched,
    SessionImplementor session) throws HibernateException 
{
		
		Object version = Versioning.getVersion(values, persister);
		session.getPersistenceContext().addEntry( 
				object, 
				Status.LOADING,
				values, 
				rowId, 
				id, 
				version, 
				lockMode, 
				true, 
				persister, 
				false, 
				lazyPropertiesAreUnfetched 
			);
		if ( log.isTraceEnabled() && version!=null ) {
			String versionStr = persister.isVersioned()
					? persister.getVersionType().toLoggableString( version, session.getFactory() )
			        : "null";
			log.trace( "Version: " + versionStr );
		}
}

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