Hibernate version:3.1

MySQL 5.0.28

Hi I need help with relation mapping

I dont know what to do and I could not find enough examples for my situation. The hibernate documentation seems hard to me right now. So somebody please help me with this.

I have two java classes Sim(parent) and Message(child). The relationship between Sim and Message is One-to-Many and, Many-to-One (Is this what is called Bidirectional?). Until now this is what I was able to do through online references:

In Sim.java


In Message.java


I have the HBM files like this:
Sim.hbm.xml:


Message.hbm.xml


And I have the tables defined respectively.
My question is how do I implement the bidirectionalily?
I read on different websites that the associations between the objects to be persisted by the developer. How do I do that?
And also, is the implementation until now correct or are there any errors in it?
How do I write the Unit Tests for these classes

Please help.

No help????

public class Sim {
...
private Set messages=new HashSet();

public void addMessage(Message m) {
m.setSim(this);
this.messages.add(m);
}
}

public class Message {
...
private Sim sim;

public void setSim(Sim s) {
this.sim=s;
}
}

This is called the scafoolding code.

Pls rate if this helped you!

If you are using Lists then Set should be replaced by List. Also i excluded the generics related stuff for brevity

sorry for this simple question but where am I calling the 'addMessage' method? i searched for scaffolding but could not find any info....

any help regarding this please?

it something you write to implement the adding of the child to the parent.

first set the child's link id to the parents - this is the link from the child to the parent.

then add the child to the set/list - this is the link from the parent to the child