hibernate beans

@Entity(name = "track")
@Table(
        indexes = @Index(
                name = "idx_programme_id",
                columnList = "programme_id"
        )
)
public class Track {

    private String song_name; //really irratating these have to be (apparently) mutable!
    private String artist;
    private Programme programme;
    private long id;

    public String getSong_name() {
        return song_name;
    }

    public void setSong_name(String song_name) {
        this.song_name = song_name;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String artist) {
        this.artist = artist;
    }

    public void setProgramme(Programme programme) {
        this.programme = programme;
    }

    @JoinColumn(name = "programme_id",
            foreignKey = @ForeignKey(name = "PROGRAMME_PROGRAMME_ID_FK"))
    @ManyToOne(fetch = FetchType.LAZY)
    public Programme getProgramme() {
        return programme;
    }

    @Id
    @GeneratedValue(generator="increment")
    @GenericGenerator(name="increment", strategy = "increment")
    public Long getId() {
        return id;
    }

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

    public Track(String song_name, String artist) {
        this.song_name = song_name;
        this.artist = artist;
    }

    public Track(String song_name, String artist, Programme programme, long id) {
        this.song_name = song_name;
        this.artist = artist;
        this.programme = programme;
        this.id = id;
    }

    public Track() {
    }
}

*****
@Entity(name = "programme")
public class Programme {

    @Id
    private long programme_id;
    private int presenter_origin_id;
    private String date;

    public long getProgramme_id() {
        return programme_id;
    }

    public void setProgramme_id(long programme_id) {
        this.programme_id = programme_id;
    }

    public int getPresenter_origin_id() {
        return presenter_origin_id;
    }

    public void setPresenter_origin_id(int presenter_origin_id) {
        this.presenter_origin_id = presenter_origin_id;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public Programme(long programme_id, int presenter_origin_id, String date) {
        this.programme_id = programme_id;
        this.presenter_origin_id = presenter_origin_id;
        this.date = date;
    }

    public Programme() {
    }
}

*****
@Entity
@Table(name = "presenter")
public class Presenter {

    private String presenter_name;
    private int presenter_id;

    public Presenter(String presenter_name, int presenter_id) {
        this.presenter_name = presenter_name;
        this.presenter_id = presenter_id;
    }

    public Presenter() {
    }

    public String getPresenter_name() {
        return presenter_name;
    }

    public void setPresenter_name(String presenter_name) {
        this.presenter_name = presenter_name;
    }

    @Id
    public int getPresenter_id() {
        return presenter_id;
    }

    public void setPresenter_id(int presenter_id) {
        this.presenter_id = presenter_id;
    }


}