@Id
@GenericGenerator(name = "idGenerator", strategy = "assigned")
@GeneratedValue(generator = "idGenerator")
@Column(name="TE_KEY")
private String id;

@OneToMany
@JoinColumn(name="TA_KEY", referencedColumnName="TE_KEY", insertable=false, updatable=false)
private List< TA > taList;
}

@Entity
public class TE1 extends TE {
}

@Entity
public class TE2 extends TE {
}

@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="ta_type")
public abstract class TA {

@Id
@GenericGenerator(name = "idGenerator", strategy = "assigned")
@GeneratedValue(generator = "idGenerator")
@Column(name="TA_KEY")
private String id;

public abstract void setTE(TE TE);

public abstract TE getTE();
}

@Entity
@DiscriminatorValue("TE1")
public class TA1 extends TA {

@ManyToOne(targetEntity=TE1.class)
@JoinColumn(name="TE_ENTITY_FK")
private TE TE;

public TE getTE() {
return TE;
}

public void setTE(TE TE) {
this.TE = TE;
}
}

@Entity
@DiscriminatorValue("TE2")
public class TA2 extends TA {

@ManyToOne(targetEntity=TE2.class)
@JoinColumn(name="TE_ENTITY_FK")
private TE TE;

public TE getTE() {
return TE;
}

public void setTE(TE TE) {
this.TE = TE;
}