Kotlin spring JPA. lateinit property has not been initialized exception from getting lazy field of JPA entity - spring

Question

I use Spring Boot, Hibernate, Kotlin
In build.gradle.kts:
apply(plugin="org.hibernate.orm")
tasks.withType<org.hibernate.orm.tooling.gradle.EnhanceTask>().configureEach {
options.enableLazyInitialization = true
options.enableDirtyTracking = true
options.enableAssociationManagement = true
}
User entity:
#Entity
#Table(name = "user")
class User(
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
var id: Long = -1,
#Column(name = "user_name", unique = true, nullable = false, length = 20)
var userName: String = "",
#Column(unique = true, nullable = false)
var email: String = "",
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name = "user_roles", joinColumns = [JoinColumn(name = "user_id")],
inverseJoinColumns = [JoinColumn(name = "role_id")])
var roles: MutableSet<Role> = mutableSetOf()
) {
#OneToOne(fetch = FetchType.LAZY, cascade = [CascadeType.ALL], mappedBy = "user", optional = false)
#LazyToOne(LazyToOneOption.PROXY)
#LazyGroup( "person" )
lateinit var person: Person
....
}
I get it by:
#Transactional
#Component
class UserServiceImpl (private val userRepository: UserRepository){
override fun getUserData(id: Long): Optional<UserView> {
return userRepository.findById(id).map { UserView.build(it, it.person) }
}
...
}
And it.person throws lateinit property has not been initialized exception, but Person was loaded( I see it by hibernate log ). Getting roles works fine.
I have same result without #LazyToOne(LazyToOneOption.PROXY) and #LazyGroup( "person" ).
SOLVED:
#OneToOne(fetch = FetchType.LAZY, cascade = [CascadeType.ALL])
#JoinColumn(name = "person_id", referencedColumnName = "id")
#LazyToOne(LazyToOneOption.PROXY)
#LazyGroup( "person" )
lateinit var person: Person