@Entity
@Inheritance(strategy = InheritanceType.JOINED)

public class Percentile {

    @TableGenerator(name="GENERATOR",
       ...
    )
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE, generator="GENERATOR")
    private Long id;

    @Column
    private Double percentileKey;

    @Column
    private Double percentileValue;


@Entity
public class TimeLatencyPercentile extends Percentile {
    @ManyToOne
    @JoinColumn(name="statistics_id")
    private TimeInvocationStatistics timeInvocationStatistics;