No message body writer has been found for response class HibernateQueryException问题解决

2016.04.07更新

1. findBy语句引起的

List<RegionEntity> list = findBy("id", true, Restrictions.eq("cityId", id));

因为数据库中字段大小写是不区分的，所以对于cityId我一直没有注意到是大小写问题，反复查看，以为是语句的问题，最后单步调试一点一点调才发现，这个cityId的大小写，必须和实体类里面的大小写相对应！！

package com.express.model;

import javax.persistence.*;
import javax.xml.bind.annotation.XmlRootElement;

/** * Created by violet on 2016/4/6. */
@Entity
@Table(name = "region", schema = "", catalog = "express")
@org.hibernate.annotations.Proxy(lazy=false)
@XmlRootElement(name = "Region")
public class RegionEntity {
    private int id;
    private String area;
    private Integer cityId;

    public RegionEntity() {
    }

    public RegionEntity(int id, String area, Integer cityId) {
        this.id = id;
        this.area = area;
        this.cityId = cityId;
    }

   ………………