JPA按实体类对象参数中的字段排序问题得解决方法
@Entity

@Table(name="complaints")

@NamedEntityGraphs({

    @NamedEntityGraph(name="allJoinsButMessages", attributeNodes = {

            @NamedAttributeNode("customer"),

            @NamedAttributeNode("handling_employee"),

            @NamedAttributeNode("genre")

    }),

    @NamedEntityGraph(name="allJoins", attributeNodes = {

            @NamedAttributeNode("customer"),

            @NamedAttributeNode("handling_employee"),

            @NamedAttributeNode("genre"),

            @NamedAttributeNode("complaintMessages")

    }),

    @NamedEntityGraph(name="noJoins", attributeNodes = {

    })

})

public class Complaint implements Serializable{

    private static final long serialVersionUID = 1L;

    @Id

    @GeneratedValue

    private long id;

    private Timestamp date;

    @ManyToOne(fetch = FetchType.LAZY)

    @JoinColumn(name = "customer")

    private User customer;

    @ManyToOne(fetch = FetchType.LAZY)

    @JoinColumn(name = "handling_employee")

    private User handling_employee;

    @ManyToOne(fetch = FetchType.LAZY)

    @JoinColumn(name="genre")

    private Genre genre;

    private boolean closed;

    @OneToMany(mappedBy = "complaint", fetch = FetchType.LAZY, cascade = CascadeType.ALL)

    private List<ComplaintMessage> complaintMessages = new ArrayList<ComplaintMessage>();

//getters and setters

}

@Repository

public interface ComplaintRepository extends JpaRepository<Complaint, Long>{

    List<Complaint> findByClosed(boolean closed);

    @EntityGraph(value = "allJoinsButMessages" , type=EntityGraphType.FETCH)

    @Override

    List<Complaint> findAll(Sort sort);

}