java - Order by not working for child objects in Hibernate -

i want retrieve child objects sorted on particular column.
have parent class student

public class student {      @id      @generatedvalue(strategy=generationtype.auto)     @column(name="student_id")     private long studentid;       @column(name="student_name")     private string studentname;      @onetomany(mappedby="student")     private list<phone> studentphonenumbers ;  } 

and child class phone

public class phone {      @id      @generatedvalue(strategy=generationtype.auto)     @column(name="phone_id")     private long phoneid;       @column(name="phone_no")     private string phonenumber;      @column(name ="update_tmstp")     private date updatetmstp;      @manytoone     @joincolumn(name = "student_id")     private student student; } 

i fetching student object in turns gives me list of phone nos. , want phone nos sorted based on column updatetmstp wrote this

student stu = (student)session.createcriteria(student.class)                 .createalias("studentphonenumbers", "st").addorder(order.desc("st.updatetmstp")).uniqueresult(); 

but not working. can me. did wrong?

under studentphonenumbers place orderby annotation , on query use join fetch bring phones eagerly.

be aware means fecth on studentphonenumbers allways generate select ... order by. if that's not want suggest sort collection in code after results.