public class Os { 
    private Long id; 
    private Set<OsFeature> osFeatures = new HashSet<OsFeature>(); 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name="OsId", unique = true, nullable = false, insertable = true, 
     updatable = true) 
    public Long getOsId() { 
return osId; 
     } 
      @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "os") 
    public Set<OsFeature> getOsFeatures() { 
return osFeatures; 
    } 
} 
 

public class OsFeature｛ 
   
   private Long id; 
    private Os os;
@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "OsFeatureId", unique = true, nullable = false,  insertable = true, updatable = true) 
public Long getId() { 
    return id; 
} 
@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "OsId", referencedColumnName = "OsId", unique = false, nullable = false, insertable = true, updatable = true) 
public Os getOs() { 
    return os; 
} 
} 
 

如果join後面跟的是OsFeature物件，將會報Path expected for join異常！