JPA - Issue with OneToOne relationship when two foreign keys are primary key to entity - spring-boot

Question

Two foreign keys act as primary key in entity for OneToOne, I'm getting error "Provided id of the wrong type for class ....."
When I tried to POST data, It's getting inserted correctly but GET is not working.
If I change OneToOne to OneToMany it is working for POST & GET both.
Request:
{
"items": [
{
"applicant": {
"guests": [
{
"seqNumber": 1,
"name": "name",
"gender": "gender"
}
]
}
}
]
}
Back Reference:
reservation.getItems().forEach(i -> {
i.setReservation(reservation);
i.getApplicant().setItem(i);
i.getApplicant().getGuests().forEach(g -> g.setApplicant(i.getApplicant()));
});
Reservation Entity:
#Entity
#Getter
#Setter
public class Reservation {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "ID_RESERVATION", nullable = false, updatable = false)
private String reservationId;
#OneToMany(mappedBy = "reservation", cascade = CascadeType.ALL, orphanRemoval = true)
#JsonManagedReference
private Set<Item> items = new HashSet<>();
}
Item Entity:
#Entity
#Getter
#Setter
#IdClass(Item.ItemKey.class)
public class Item {
#Id
#Column(name = "ID_ITEM_RESERVATION", nullable = false, updatable = false)
private long itemReservationId;
#Id
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "ID_RESERVATION", referencedColumnName = "ID_RESERVATION", nullable = false, updatable = false)
#JsonBackReference
private Reservation reservation;
#OneToOne(mappedBy = "item", cascade = CascadeType.ALL)
#JsonManagedReference
private Applicant applicant;
#Data
static class ItemKey implements Serializable {
private Reservation reservation;
private long itemReservationId;
}
}
Applicant Entity:
#Entity
#Getter
#Setter
#IdClass(Applicant.ApplicantKey.class)
public class Applicant {
#Id
#OneToOne(fetch = FetchType.LAZY)
#JoinColumns({
#JoinColumn(name = "ID_RESERVATION", referencedColumnName = "ID_RESERVATION", nullable = false, updatable = false),
#JoinColumn(name = "ID_ITEM_RESERVATION", referencedColumnName = "ID_ITEM_RESERVATION", nullable = false, updatable = false)
})
#JsonBackReference
private Item item;
#OneToMany(mappedBy = "applicant", cascade = CascadeType.ALL, orphanRemoval = true)
#JsonManagedReference
private Set<Guest> guests = new HashSet<>();
#Data
static class ApplicantKey implements Serializable {
private Item item;
}
}
Guest Entity:
#Entity
#Getter
#Setter
#IdClass(Guest.GuestKey.class)
public class Guest {
#Id
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumns({
#JoinColumn(name = "ID_RESERVATION", referencedColumnName = "ID_RESERVATION", nullable = false, updatable = false),
#JoinColumn(name = "ID_ITEM_RESERVATION", referencedColumnName = "ID_ITEM_RESERVATION", nullable = false, updatable = false)
})
#JsonBackReference
private Applicant applicant;
#Id
#Column(name = "S_NUMBER", nullable = false, updatable = false)
private Short seqNumber;
#Column(name = "N_NAME")
private String name;
#Column(name = "CD_GENDER")
private String gender;
#Data
static class GuestKey implements Serializable {
private Applicant applicant;
private Short seqNumber;
}
}
Expected output must be same as Request but getting error " ... Provided id of the wrong type for class ..."
Here is the code.