java - Querying associate table with HQL -

i have 2 entity class onetomany relationship:

@entity @xmlrootelement @dynamicinsert (value = true) @dynamicupdate (value = true) public class matchs {     @id @generatedvalue    private long matchid;    private int size;     @onetomany(fetch = fetchtype.lazy)    @jointable(name = "match_users",joincolumns=@joincolumn(name="match_id"),    inversejoincolumns=@joincolumn(name="user_id"))    private list<user> users;        //getters & setters }  @entity @xmlrootelement @dynamicinsert (value = true) @dynamicupdate (value = true) public class user {      @id     private string username;     private string lastname,firstname,password,email;      private date dateofbirth;         //getters & setters   } 

i want matchs particular user.this query:

 matchs user.username=:username  

this query throws org.hibernate.queryexception. how can accomplish hql.

you seems fetching data on column not exist in matchs table. don't see column or relationship in matchs class username