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How to use @Formula (in Hibernate) to refer to the same (current) object
@Entity
@Table(name = "DB.APPL_SESSION")
@AttributeOverrides({@AttributeOverride(name = "id", column = @Column(name = "APPL_SESSION_ID"))})
@SequenceGenerator(name = "TableSequence", sequenceName = "DB.APPL_SESSION_SQ")

public class AiSession{

@Formula("(select sum(nvl(budg.AMT_OV,budg.AMT)) from DB.BUDGET budg where budg.APPL_SESSION_ID = APPL_SESSION_ID)")
private LocalDate realSessionStartDate;

@Basic
@Temporal(TemporalType.DATE)
@Column(name = "START_OV_DT")
private Date overrideStartDate;

@Formula("(select START_OV_DT from DB.APPL_SESSION)")

@Formula("START_OV_DT")