Collection Based Property Problem

[Flex_Architect]

Hello All,



I have what seems to be a simple object domain of User
objects that contain multiple PhoneNumber objects. My AS and Java
User classes look like this:



package com.abc.domain

{

import mx.collections.ArrayCollection;



[Managed]

[RemoteClass(alias="com.abc.domain.User")]



public class User

{



public var id:Number = 0;



public var firstName:String;



public var username:String;



public var lastName:String;



public var email:String;



public var phoneNumbers:ArrayCollection;



public function User():void

{

phoneNumbers = new ArrayCollection();

}



}

}



The corresponding Java Class (using EJB 3.0's Java
Persistence API):



package com.abc.domain;



import java.io.Serializable;

import javax.persistence.*;

import java.util.*;

import javax.persistence.OneToMany;

import javax.persistence.CascadeType;

import javax.persistence.FetchType;

import javax.persistence.JoinTable;

import javax.persistence.JoinColumn;

import javax.persistence.GeneratedValue;



@Entity

@Table(name="users")

public class User implements Serializable {

private static final long serialVersionUID =
-2598982624653333910L;



@Id

@GeneratedValue

private long id;



@Column(name="first_name")

private String firstName;



private String username;



@Column(name="last_name")

private String lastName;



private String email;



@OneToMany(cascade=CascadeType.ALL, fetch = FetchType.EAGER)

@JoinTable(name="user_phone_numbers", joinColumns =
@JoinColumn(name = "user_id", referencedColumnName = "id"),
inverseJoinColumns = @JoinColumn(name = "phone_id",
referencedColumnName = "id"))

private Collection<PhoneNumber> phoneNumbers;



public User() {

super();

}



*********** Getters and Setters Here ***********

}



The PhoneNumber classes are similar in nature.



The problem I am having is that when I commit() from the
DataService object in flex the collection of PhoneNumbers does not
appear to be initialized by the class loader. I know that the
ArrayCollection exists right up to the point of commiting, but
after the updated data returns it is empty. Debugging the server
side SessionBean shows the user data intact, with an empty
ArrayList for the PhoneNumbers. Am I missing something here? Can
you use a Collection of strongly typed objects as a property from
FDS to a Java assembler?



Thanks for the help,

Anthony McClure

[aBill]

Hi,



Try remove

phoneNumbers = new ArrayCollection();

from you constructor!

I saw similar problem before! Hope it helps!



William Chan

[Flex_Architect]

Well tried to remove the Constuctors ArrayCollection
instantiation but it does not seem to help. I have to create the
instance before adding the PhoneNumber instance to it anyway as I
am creating a new user and not updating an existing one.



I should be able to create a new User instance... instantiate
the phoneNumbers array collection... add an instance of a
PhoneNumber to the array collection and then commit() correct? Will
data services not work with a collection of embedded
objects?

[Flex_Architect]

I found what I was doing wrong.



Here is the code I had in the Java class:

public void setPhoneNumbers(List<PhoneNumber>
phoneNumbers) {

this.phoneNumbers = phoneNumbers;

}



It should have been:

public void setPhoneNumbers(
Collection<PhoneNumber>
phoneNumbers) {

this.phoneNumbers = phoneNumbers;

}



As this is the datatype set for the private property.