How are you supposed to add a child entity in a CMP CMR 1-to

[davout]

I'm a little confused about how a CMP entity bean that has 1-M relationship link to a subordinate entity should handle the creation new subordinate entity instances.

For instance,...

class Entity1Bean {
ejbCreate(....)
Collection getEntity2List() // returns collection of 'Entity2'
}

class Entity2Bean {
ejbCreate(....)
}

At the moment I'm handling the creation of new Entity2 instances by....

Entity2Home.create(....)

However, when I then use 'Entity1Home.getEntity2List' to retrieve a list of
linked sub entities the newly created Entity2 instance is not part of the
list.

I then tried adding.....

aNewEntity1 = Entity2Home.create(....)
Entity1Home.getEntity2List().add(aNewEntity1);

... and it still didn't work. What am I doing wrong?

[aagmon]

the Entitiy's home is creating instances of the Entitiy's Remote Interface

Collection entities = Ent1Home.findBySomething();

Iterator t = entities.iterator()

while(t.hasNext){
Ent1Remote ent1 = (Ent1Remote)t.next;

ent1.doSomething()

}

[davout]

I'm not sure if I understand your point. The CMR based Entity1 collection of Entity2 instances doesn't appear to be updated after an Entity2 instance is separately created.

[aagmon]

ok,
lets say we have a team and player entities.

use a session bean that preforms a lookup for team's and player's home.

you can add to the session bean:
after you create a new player

public void addPlayer(String player_name ,String team){

Player player = PlayerHome.create(player_name);

Team team = home.findByName(team);

team.add(player);


}

while in the Team entity the add() will be implemented as:

public add(Player player){
Collection players = getPlayers();
players.add(player);
}

[davout]

Many thanks for the response...

I'd sought of guessed the answer might be something like you suggested.

However, this raises another problem. What if 'Entity2' has a property called 'Color' and the color entity owns a collection of Entity2 objects, like...

class Entity1Bean {
ejbCreate(....)
Collection getEntity2List() // returns collection of 'Entity2'
}

class Entity2Bean {
ejbCreate(....)
Color getColor // points at related color object
}

class ColorBean {
Collection getEntity2List() // returns collection of 'Entity2' objects
// that share the same color
}

In this case where 'Entity2' has two different entities in which it appears as a collection entry, where would you call the 'add'. Or do you have to call both?