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From "Pinaki Poddar" <>
Subject RE: Are relation sets identity, pk or bean.equals() based?
Date Thu, 14 Dec 2006 04:11:20 GMT
In addition to Marc's explanation+
If the collection/map field is instantiated with a type more specific
than the declared type (either in field declaration or in no-arg
constructor), then the more specific type is used.

for example,
public class A {
    Collection f1 = new HashSet();
    List f2;
    public A() {
        f2 = new LinkedList();

OpenJPA will use ProxyHashSet for f1 and ProxyLinkedList for f2. 

Pinaki Poddar
BEA Systems

-----Original Message-----
From: Dain Sundstrom [] 
Sent: Wednesday, December 13, 2006 7:24 PM
Subject: Re: Are relation sets identity, pk or bean.equals() based?

On Dec 13, 2006, at 4:56 PM, Marc Prud'hommeaux wrote:

>> If you declare the field to be an interface type and you don't 
>> initialize the field to anything, I don't remember how we decide what

>> impl to use.
> Looking at the code in, it appears that we 
> default to ArrayList for fields declared as type Collection, HashSet 
> for fields declared as type Set, TreeSet for fields declared as type 
> SortedSet, and ArrayList for fields declared as type List.

Thanks! That is exactly what I wanted to know.

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