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Guest · Posted: Fri Dec 29, 2006 9:40 pm Post subject: "Hibernate"-ing maps

Hi!

I'm using Java + Hibernate for data persistence, but I'm stuck on
hibernating second-order collections (collection of collections). I
asked this on Hibernate User Forum but got no response. What I'm trying
to do is this:

class Exam {
...
private Map<Room,List<Student>> schedule = new HashMap<Room,
List<Student>>(50);
...
}

Exam, Room and Student are all entitys, with their ID-s. Although
database model for storing "schedule" is trivial:

create table schedule (
exam_id bigint not null,
room_id varchar(30) not null,
list_index integer not null,
student_id varchar(30) not null,
primary key(exam_id, room_id, list_index)
);

I don't know how to tell Hibernate to create/use it. I dont directly
write hibernate xml descriptors, but use X-doclet for this task. So, if
anyone can tell me what X-doclet tags to write on getSchedule() method?

Thanks!

PS. If hibernate does not support this, that would also be valuable
information...