@Entity
@Table(name = "KNOTS")
@org.hibernate.annotations.Entity(optimisticLock = org.hibernate.annotations.OptimisticLockType.ALL, dynamicInsert = true, dynamicUpdate = true)
public class Knot implements Serializable, TreeElement {
   
       @Id
   @Column(name="KNOT_ID")
   @GeneratedValue(strategy = GenerationType.AUTO)
   private int id ;
   
       @OneToMany(mappedBy = "parent", cascade={CascadeType.ALL})
   @JoinTable(name = "ALBUMS_KNOT", joinColumns = {    @JoinColumn(name = "ALBUM_ID") }, inverseJoinColumns = { @JoinColumn(name = "KNOT_ID") })
   /** Liste an Alben die der Knoten beinhaltet */
   private List<Album> albums = new Vector<Album>();

@OneToMany(cascade = { CascadeType.PERSIST, 
                     CascadeType.MERGE})
   @JoinTable(name = "KNOT_KNOTS", joinColumns = { @JoinColumn(name = "KNOT_ID") }, inverseJoinColumns = { @JoinColumn(name = "KNOT2_ID") })
   /** Liste an Knoten die der Knoten beinhaltet */
   private List<Knot> knots = new Vector<Knot>();

@ManyToOne(cascade={CascadeType.MERGE,
   CascadeType.PERSIST, CascadeType.REFRESH})
   /** Übergeordneter Knoten */
   private Knot parent = null;

   /** Name des Knoten */
   private String name;

   @Version
   private int version = 0;

       // ..........