@Entity
@Table(name = "MyEntity")
public class MyEntity implements Serializable {
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    private String uuid;
    private String guid;
    private Boolean isLast;
    private String name;
    @ManyToOne
    private MyEntity previous;
    @ManyToOne
    @JoinColumnsOrFormulas({
            @JoinColumnOrFormula(column = @JoinColumn(name = "parent_guid", referencedColumnName = "guid")),
            @JoinColumnOrFormula(formula = @JoinFormula(referencedColumnName = "isLast", value = "1"))
    })
    private MyEntity parent;
    @OneToMany
    @JoinColumn(name = "parent_guid", referencedColumnName = "guid")
    @Where(clause = "isLast = 1")
    private Set<MyEntity> children;

   ... getters/setters etc ...
}

Session sess = null;
        Transaction tran;
        SessionFactory sf = new Configuration().configure("/hibernate.cfg.xml").buildSessionFactory();
        try {
            sess = sf.openSession();
            System.out.println("Session: " + sess);
            tran = sess.beginTransaction();
            MyEntity parent = new MyEntity();
            parent.setGuid(UUID.randomUUID().toString());
            parent.setLast(true);
            parent.setName("Parent");
            sess.saveOrUpdate(parent);

            String childGuid = UUID.randomUUID().toString();
            MyEntity child1 = new MyEntity();
            child1.setGuid(childGuid);
            child1.setName("Child");
            child1.setLast(false);
            child1.setParent(parent);
            sess.saveOrUpdate(child1);

            MyEntity child2 = new MyEntity();
            child2.setGuid(childGuid);
            child2.setName("Child*");
            child2.setLast(true);
            child2.setParent(parent);
            child2.setPrevious(child1);
            sess.saveOrUpdate(child2);

            tran.commit();
            sess.close();

            sess = sf.openSession();
            MyEntity persistentParent = (MyEntity) sess.get(MyEntity.class, parent.getUuid());
            System.out.println("Parent`s children count " + persistentParent.getChildren().size());
            for (MyEntity persistentChild : persistentParent.getChildren()) {
                System.out.println("Child`s children count " + persistentChild.getChildren().size());
            }
            sess.close();
        } catch (Throwable ex) {
            ex.printStackTrace();
        } finally {
            if (sess != null && sess.isOpen()) {
                sess.close();
            }
        }

Parent`s children count 1
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: test.MyEntity.children, could not initialize proxy - no Session
   at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:572)
   at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:212)
   at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:153)
   at org.hibernate.collection.internal.PersistentSet.size(PersistentSet.java:160)
   at test.Main.main(Main.java:49)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)