@Entity
@Table(name = "Resource")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "RESOURCE_TYPE_CD", discriminatorType = DiscriminatorType.INTEGER, columnDefinition = "INT")
abstract class Resource(

	@Id
	@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "RESOURCE_ID_SEQ")
	@SequenceGenerator(name = "RESOURCE_ID_SEQ", sequenceName = "RESOURCE_ID_SEQ", allocationSize = 1)
	override var id: Long? = null,

	@Column(name = "RESOURCE_TYPE_CD", insertable = false, updatable = false)
	open var resourceType: ResourceType

): MutableAuditableBaseJpa<Long>() { ... }


@Entity
@Table(name = "RESOURCE_FUTURE_ROLE")
@DiscriminatorValue("1")
class FutureRole(
    ...
): Resource(null, ResourceType.FUTURE_ROLE) { ... }


@Entity
@Table(name = "RESOURCE_CURRENT_ROLE")
@DiscriminatorValue("2")
class CurrentRole(
    ...
): Resource(null, ResourceType.CURRENT_ROLE) { ... }


@Entity
@Table(name = "RECORD")
open class Record(
	@Column(name = "RESOURCE_ID") override var resourceId: Long,
    ...
): MutableAuditableBaseJpa<Long>() {
    @OneToOne
	@NotFound(action = NotFoundAction.IGNORE)
	@JoinColumn(name = "RESOURCE_ID", insertable = false, updatable = false)
	open var futureRole: FutureRole? = null

	@OneToOne
	@NotFound(action = NotFoundAction.IGNORE)
	@JoinColumn(name = "RESOURCE_ID", insertable = false, updatable = false)
	open var employee: CurrentRole? = null
}

Caused by: org.hibernate.PropertyAccessException: Could not set value of type [com.hidden.CurrentRole]: 'com.hidden.Record.futureRole' (setter)
	at org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:88)
	at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:4360)
	at org.hibernate.sql.results.graph.entity.AbstractEntityInitializer.initializeEntityInstance(AbstractEntityInitializer.java:837)
	at org.hibernate.sql.results.graph.entity.AbstractEntityInitializer.initializeEntity(AbstractEntityInitializer.java:797)
	at org.hibernate.sql.results.graph.entity.AbstractEntityInitializer.initializeInstance(AbstractEntityInitializer.java:783)
	at org.hibernate.sql.results.internal.InitializersList.initializeInstance(InitializersList.java:71)
	at org.hibernate.sql.results.internal.StandardRowReader.coordinateInitializers(StandardRowReader.java:109)
	at org.hibernate.sql.results.internal.StandardRowReader.readRow(StandardRowReader.java:86)
	at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:201)
	at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:33)
	at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.doExecuteQuery(JdbcSelectExecutorStandardImpl.java:361)
	at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.executeQuery(JdbcSelectExecutorStandardImpl.java:168)
	at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.list(JdbcSelectExecutorStandardImpl.java:93)
	at org.hibernate.sql.exec.spi.JdbcSelectExecutor.list(JdbcSelectExecutor.java:31)
	at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.lambda$new$0(ConcreteSqmSelectQueryPlan.java:109)
	at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.withCacheableSqmInterpretation(ConcreteSqmSelectQueryPlan.java:305)
	at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.performList(ConcreteSqmSelectQueryPlan.java:246)
	at org.hibernate.query.sqm.internal.QuerySqmImpl.doList(QuerySqmImpl.java:509)
	at org.hibernate.query.spi.AbstractSelectionQuery.list(AbstractSelectionQuery.java:427)
	at org.hibernate.query.spi.AbstractSelectionQuery.getSingleResult(AbstractSelectionQuery.java:559)