JPA nested object LAZY FETCH returns only first object

I have the following.

@Data
@Getter
@Setter
@Accessors(fluent = false, chain = true)
@NoArgsConstructor
@AllArgsConstructor
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@MappedSuperclass
@Slf4j
class Base {
private Timestamp createdTime;
private Timestamp modifiedTime;
private String createdBy;
private String modifiedBy;
private Boolean deleted = false;
}
@Getter
@Setter
@Builder
@EqualsAndHashCode
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "account")
@SQLDelete(sql = "UPDATE account SET deleted = true WHERE account_id = ?")
@Where(clause = "deleted=false")
class Account {
@Id
@EqualsAndHashCode.Include()
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long accountId;
@Builder.Default
@OneToMany(fetch = FetchType.LAZY, mappedBy = "account", cascade = {CascadeType.ALL})
private Set<Collab> collaborators = new HashSet<>(0);
private String objId;
}
class Collab {
@Id
@EqualsAndHashCode.Include()
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long collabId;
private String email;
private String role;
@JsonBackReference
@JoinColumn(name = "accountId")
@ManyToOne(fetch = FetchType.EAGER)
private Account account;
}
public interface AccountRepo {
Optional<Account> findByObjId(String objId);
}

Even though there are multiple collab for a single account in the DB.
When I inspect the response of AccountRepo.findByObjId (or findAll) method, only 1 element is inside collaborators for any account object. What am I missing?

PS: @EqualsAndHashCode.Include() is from lombok

When you inspect the response of AccountRepo.findByObjId or findAll, you may only see one element inside the collaborators set because the lazy-loading mechanism loads the related Collab entities on-demand. If you access the collaborators set after retrieving an Account object, it should trigger the loading of the associated Collab entities from the database.

Try by implementing a getter method for collaborators like this

public Set<Collab> getCollaborators() {
return collaborators;
}

after that you can access the collaborators like this

Optional<Account> accountOptional = accountRepo.findByObjId(objId);
if (accountOptional.isPresent()) {
Account account = accountOptional.get();
Set<Collab> collaborators = account.getCollaborators(); // Load collaborators
}

Turns our I had the following annotation in the BaseClass which was causing the issue with Hashcode/Equals and eventually the items in the Set.

@EqualsAndHashCode(onlyExplicitlyIncluded = true)