Model.java

@Entity
public class Starship {

	@Id @GeneratedValue(strategy=GenerationType.SEQUENCE) 
	private Long id;
	public Long getId() {return id;}
	protected void setId(Long id) {this.id = id;}

	@OneToMany(mappedBy="starship", cascade={CascadeType.ALL}) 
	private List<Officer> officers = new ArrayList<Officer>();
	public List<Officer> getOfficers() {return Collections.unmodifiableList(officers);}
	protected void setOfficers(List<Officer> officers) {this.officers = officers;}
	public void addOfficer(Officer officer) {
		officer.setStarship(this);
		this.officers.add(officer);
	}

        //more code
}

@Entity
public class Officer {

	@Id @GeneratedValue(strategy=GenerationType.SEQUENCE) 
	private Long id;
	public Long getId() {return id;}
	protected void setId(Long id) {this.id = id;}

	@ManyToOne private Starship starship;	
	public Starship getStarship() {return starship;}
	protected void setStarship(Starship starship) {this.starship = starship;}

        //more code
}