我正在尝试使用hibernate中的投影返回部分对象，如下所示：
电影课：
@Table(name = "Movies")
public class Movie extends Entity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
@Column(name = "title")
private String title;
@OneToMany(cascade = CascadeType.MERGE, fetch = FetchType.EAGER)
@JoinTable(name = "Movie_Genre", joinColumns = {@JoinColumn(name = "movieId")}, inverseJoinColumns = {@JoinColumn(name = "genreId")})
private List<Genre> genres;
然后，当用户转到htp：// localhost：8080 / api / movies？fields = genres时，这称为：
电影DAO：
Criteria cr = getCurrentSession().createCriteria(Movie.class);
ProjectionList projectionList = Projections.projectionList();
projectionList.add(Projections.property("genres"), "genres");
cr.setProjection(projectionList);
cr.setResultTransformer(Transformers.aliasToBean(Movie.class));
return cr.list();
但这返回：
java.lang.ArrayIndexOutOfBoundsException: 0
org.hibernate.loader.criteria.CriteriaLoader.getResultRow(CriteriaLoader.java:166)
休眠查询：
select this_.id as …