Hi,
I set up two classes like in the documentation example in section 2.2.5.3.3.1. However, when I have a handle to a child object, the parent relation Set is empty. I do not explicitly set this relation, but expect it to be populated for me.

There is a join table and I use this on the parent side (ReportModel):


@ManyToMany(
targetEntity=mil.darpa.tn.model.EventModel.class,
fetch=FetchType.EAGER,
cascade={CascadeType.PERSIST, CascadeType.MERGE}
)
@JoinTable(
name="reports_events",
joinColumns={@JoinColumn(name="reports_id")},
inverseJoinColumns={@JoinColumn(name="events_id")}
)
public Set<EventModel> getEvents() {
return events;
}


And this on the child side (EventModel):

@ManyToMany(
cascade={CascadeType.PERSIST, CascadeType.MERGE},
mappedBy="events",
targetEntity=mil.darpa.tn.model.ReportModel.class
)
public Set<ReportModel> getReports() {
return reports;
}

I see the join table, but for the child object, its getReports() is always empty when I am expecting it to be filled with inverse relations.

What am I missing?

Thank you!
Darren

There are a few things that could cause this...one, there is no data in the tables (probably unlikely in your case), or you haven't defined your foreign key relationships on the tables.

It might help if you provide the mapping files.

Hi,
Thanks for the response. I guess there are no mapping files since I am using hibernate annotations?

I have 3 tables that come out of it (I auto generate using hibernatetool).

--
reports

reports_events (reports_id, events_id)

events

--
Now, I save a report fine and its children of events also save, and the relation is held in reports_events.

I assumed that the table reports_events would join for both directions, so no "events_reports" table is needed because I am not explicitly setting that relation, only providing the methods.

Do I need a @Join annotation on the events to tell hibernate how to load the report objects (that refer to it) when it is loaded without me having to do it?

I'm a bit new to this, so maybe I missed something. I followed the example precisely.

Darren