[eclipselink-users] Lazying-loaidng and Collection.size()

[cowwoc <cowwoc@xxxxxxxxxxxxxxxx>]

Hi,

What does the JPA standard (and alternatively EclipseLink) say about Lazy
Loading and Collection/Set/List.size()? If the collection hasn't been
initialized yet, does size() simply invoke a count(*) query or does it
retrieve the entire collection including its elements?

I'm thinking of the following use-case:

1) int size = myList.size();
2) Object randomElement = myList.get((int) (Math.random() * size));

What is guaranteed to happen under the hood according to JPA and according
to EclipseLink? Ideally I want to pass a Collection around my API, instead
of forcing it to be Query-aware and issue SQL statements explicitly.

Thank you,
Gili
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