spring mvc - how can I use hibernate to get OneToMany reference datas -

i want make ordermeal web project in using springmvc+spring+hibernate. seens got problems @ printing datas on jsp pages.

when debug project(i'm sorry can't post debug picture t_t)

i can not figure out why property "mealorders" empty... have insert many datas tables.

here entitys , hql query

user class

 @entity @table(name="userbaseinfo") public class user implements serializable  {      private static final long serialversionuid = 1l;      private long userid;//id     private string username;     private string loginname;     private string userpassword;     private string cleartextpassword;     private string postion;     private string telephone;     private string email;     private string userlocation;     private date createtime;     private date lastedittime;     private date passwordedittime;     private int onlinetime;     private string lastloginip;     private int logincount;     private int userstate;      private set<mealorder> mealorders = new hashset<mealorder>();     @id     @generatedvalue     @column(name = "id")     public long getuserid() {         return userid;     }     ...i hide useless propertys     @onetomany(targetentity=mealorder.class, fetch=fetchtype.lazy, cascade={cascadetype.all}, mappedby = "user")     public set<mealorder> getmealorders() {         return mealorders;     }      public void setmealorders(set<mealorder> mealorders) {         this.mealorders = mealorders;     } 

mealorder class

@entity @table(name="mealorder") public class mealorder  implements serializable {      private static final long serialversionuid = 1l;      private long mealorderid;     private int orderstate;     //private long userid;     private string username;     private string postion;     private string telephone;     private string userlocation;     private date ordertime;     private string restaurantname;     private int restaurantid;     private string supplytimetype;     private date beginsupplytime;     private date endsupplytime;     private date beginsupplydate;     private date endsupplydate;     private int mealmenuid;     private string mealmenuname;     private string mealpackagename;     private int mealpackageid;     private float mealpackageprice;      private user user;      @id     @generatedvalue     @column(name = "id")     public long getmealorderid() {         return mealorderid;     }      public void setmealorderid(long mealorderid) {         this.mealorderid = mealorderid;     }     ...i hide useless propertys     @manytoone(fetch=fetchtype.lazy,cascade = cascadetype.all)     @joincolumn(name = "userid")     public user getuser() {         return user;     }      public void setuser(user user) {         this.user = user;     } 

and hql query below

@suppresswarnings("unchecked") @override public list<user> findallusers() {     session session = sessionfactory.opensession();     org.hibernate.query query = session.createquery("from user u left join u.mealorders");     return (list<user>) query.list(); } 

and jsp page(it can not print datas)

<c:foreach items="${users}" var="user">             <tr>                 <td>${user.username}</td>                 <td>${user.userid}</td>             </tr>         </c:foreach> 

how can print datas on jsp page?

1. you can make fetch type eager force user retrieve it's children (not desired performance-wise in case don't need data).
2. you can "get" children while transaction still open result in query db.
3. you can change query "left join fetch" force object creation.