Is it possible to store a method return value in the database without having a corresponding attribute?

Let's say I have the following class.

@Entity
public class ShiftDetail {
  @Id
  private Integer id = null;
  private String name = null;

  private LocalTime startTime = null;
  private LocalTime endTime = null;

  public Duration getShifDurationInSeconds() {
    return Duration.between(this.startTime, this.endTime).toSeconds();
  }
}

For making some down-the-line processing easier, I would like to store the derived value "ShiftDurationInSeconds" in the database.

Is there a way to do this with JPA/ Hibernate without creating an attribute in the class?

You can use @PreUpdate and @PrePersist for calculate field persist in database.

private long shiftDurationInSeconds;

@PreUpdate
@PrePersist
public void calShiftDurationInSeconds() {
    shiftDurationInSeconds = Duration.between(this.startTime, this.endTime).getSeconds();
}