@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Table(schema = "scott", name = "tb_animal")
@DiscriminatorColumn(discriminatorType = DiscriminatorType.STRING, name = "brand")
@SequenceGenerator(name = "mysequence", allocationSize = 1, sequenceName = "sq_animal")
public class Animal implements Serializable {
    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "mysequence")
    private Long id;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }
}

@Entity
@DiscriminatorValue("cat")
@SecondaryTable(
        pkJoinColumns = {@PrimaryKeyJoinColumn(name = "pk_animal", referencedColumnName = "id")},
        schema = "scott", name = "tb_cat"
)
public class Cat extends Animal {
    @Column(name = "color", table = "tb_cat")
    private String color;

    @Column(name = "name", table = "tb_cat")
    private String name;

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

@Entity
@DiscriminatorValue("dog")
@SecondaryTable(
        pkJoinColumns = {@PrimaryKeyJoinColumn(name = "pk_animal", referencedColumnName = "id")},
        schema = "scott", name = "tb_dog"
)
public class Dog extends Animal {
    @Column(name = "race", table = "tb_dog")
    private String race;

    @Column(name = "weight", table = "tb_dog")
    private Float weight;

    public String getRace() {
        return race;
    }

    public void setRace(String race) {
        this.race = race;
    }

    public Float getWeight() {
        return weight;
    }

    public void setWeight(Float weight) {
        this.weight = weight;
    }
}