@Embeddable
public class PersistId
	implements Serializable {

	private static final long serialVersionUID = 8328103682151530154L;

	@Basic
	private Integer id;

	public PersistId() {
		this.id = null;
	}

	public Integer getId() {
		return this.id;
	}

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

	public boolean equals(Object o) {
		if (!(o instanceof PersistId)) {
			return false;
		}
		PersistId d = (PersistId) o;
		return (id == d.id) || (id != null && id.equals(d.id));
	}

	public int hashCode() {
		return (id == null ? 0 : id.hashCode());
	}
}

@MappedSuperclass
public abstract class AbstractEntity {

	private static final long serialVersionUID = -8574667350713432415L;

	@EmbeddedId
	@GeneratedValue(strategy = GenerationType.AUTO)
	private PersistId id;

	public static boolean isId(PersistId id) {
		return (id != null && id.getId() > 0);
	}

	public boolean hasId() {
		return isId(getId());
	}

	public PersistId getId() {
		return this.id;
	}

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

@Entity
@Table(name = "CL_FUNCTIONS")
public class Function extends AbstractEntity {

	private static final long serialVersionUID = -8931494442608402547L;

	@Column(unique = true, nullable = false, name = "DESCR")
	private String description;

	public String getDescription() {
		return this.description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

}