List object mapped as EAGER is being fetched as LAZY - migrating Spring + Hibernate from 4 to 5 throwing org.hibernate.LazyInitializationException - jpa

Question

Spring version: 5.3.19
Hibernate: 5.4.24.Final
The problem: When trying to get the List compartments from class CriticalFlight after ScrollableData gets Cleaned up #Cleanup, the list is empty since fetch was never executed.
Custom class ScrollableData execution snipped code:
List<ENTITY> filteredEntities;
#Cleanup ScrollableData<ENTITY> scrollableData =
getScrollableData(
filter,
myMarketChecker,
additionalFilters,
staticPredicateBuilders);
filteredEntities = scrollableData.getAll();
return filteredEntities;
I loop into the list returned and try to access List compartments
then got: "org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.pros.travel.services.oandd.optimizer.alerts.entity.CriticalFlight.compartments, could not initialize proxy - no Session
"
Classes
Embeddable Class: CriticalFlightKey
#Data
#Embeddable
public class CriticalFlightKey implements Serializable
{
#DTOMapping(CriticalFlightDTO.FIELD_FLIGHTDATE)
#Convert(converter = DateToLocalDateAttributeConverter.class)
#Column(name = "FLTDATE", nullable = false)
private LocalDate flightDate;
#DTOMapping(CriticalFlightDTO.FIELD_DIM_CRRCODE)
#Column(name = "CRRCODE", nullable = false)
private String carrierCode;
#DTOMapping(CriticalFlightDTO.FIELD_DIM_FLTNUM)
#Column(name = "FLTNUM", nullable = false)
private String flightNumber;
#DTOMapping(CriticalFlightDTO.FIELD_DIM_ORGN)
#Column(name = "ORGN", nullable = false)
private String origin;
#DTOMapping(CriticalFlightDTO.FIELD_DIM_DSTN)
#Column(name = "DSTN", nullable = false)
private String destination;
}
Parent Class: CriticalFlight
#Data
#EqualsAndHashCode(of = {"id"})
#Entity
#Table(name = "OD_CRITICAL_FLIGHTS")
public class CriticalFlight implements
{
#JsonUnwrapped
#EmbeddedId
#DTOMapped
public CriticalFlightKey id;
...
....
#JsonManagedReference
#OneToMany(fetch = FetchType.EAGER)
#Fetch(FetchMode.SUBSELECT)
#JoinColumns({
#JoinColumn(name="FLTDATE", referencedColumnName="FLTDATE"),
#JoinColumn(name="CRRCODE", referencedColumnName="CRRCODE"),
#JoinColumn(name="FLTNUM", referencedColumnName="FLTNUM"),
#JoinColumn(name="ORGN", referencedColumnName="ORGN"),
#JoinColumn(name="DSTN", referencedColumnName="DSTN")
})
private List<CriticalFlightCmp> compartments = new ArrayList<>();
}
Embeddable class for child: CriticalFlightCmpKey
#Data
#Embeddable
public class CriticalFlightCmpKey implements Serializable
{
#Convert(converter = DateToLocalDateAttributeConverter.class)
#Column(name = "FLTDATE", nullable = false)
private LocalDate flightDate;
#Column(name = "CRRCODE", nullable = false)
private String carrierCode;
#Column(name = "FLTNUM", nullable = false)
private String flightNumber;
#Column(name = "ORGN", nullable = false)
private String origin;
#Column(name = "DSTN", nullable = false)
private String destination;
#Column(name = "CMPCODE", nullable = false)
private String cmpCode;
}
Child Class: CriticalFlightCmp
#Data
#EqualsAndHashCode(of = {"id"})
#Entity
#Table(name = "OD_CRITICAL_FLIGHTS_CMP")
public class CriticalFlightCmp implements IPersistable<CriticalFlightCmpKey>
{
#EmbeddedId
private CriticalFlightCmpKey id;
..
...
}
Custom class ScrollableData which uses org.hibernate.ScrollableResults to execute the query
#Slf4j
public class ScrollableData<ENTITY extends IPersistable> implements Closeable
{
private static final int SCROLLABLE_FETCH_SIZE = 10000;
private final Class<ENTITY> entityClass;
private final ScrollableResults results;
private final EntityManager entityManager;
private final List<IScrollableFilter<ENTITY>> filters = new ArrayList<>();
public ScrollableData(
Class<ENTITY> entityClass,
ScrollableResults results,
EntityManager entityManager)
{
this.entityClass = entityClass;
this.results = results;
this.entityManager = entityManager;
}
/**
* Create scrollable data from a query and entity manager session.
*
* #param entityManager Entity manager from which the query was built from.
* #param query Query to scroll on.
* #return Scrollable data
*/
static <ENTITY extends IPersistable> ScrollableData<ENTITY> fromQuery(
Class<ENTITY> entityClass,
EntityManager entityManager,
CriteriaQuery query)
{
ScrollableResults results = entityManager.createQuery(query)
.unwrap(Query.class)
.setReadOnly(true)
.setFetchSize(SCROLLABLE_FETCH_SIZE)
.setCacheable(false)
.scroll(ScrollMode.FORWARD_ONLY);
return new ScrollableData<>(entityClass, results, entityManager);
}
public List<ENTITY> getAll()
{
List<ENTITY> allEntities = new ArrayList<>();
while (next())
{
allEntities.add(get());
}
return allEntities;
}
/**
* Clears the hibernate session of any entities it's caching.
*/
public void clearSession()
{
log.debug("Clearing Session for {}", entityClass.getSimpleName());
Session hibernateSession = entityManager.unwrap(Session.class);
hibernateSession.clear();
}
/**
* Closes the scrollable results and the session contained in the entity manager.
*/
public void close()
{
clearSession();
if (results != null)
{
log.debug("Closing ScrollableResults for {}",
entityClass.getSimpleName());
results.close();
}
if (entityManager != null)
{
log.debug("Clearing EntityManager for {}", entityClass.getSimpleName());
entityManager.close();
}
}
}