immutability and persistence?

[andiqo <no...@gmail.com>]

Hello!

I was wondering if I could expect performance boost using immutable
instances over mutable ones, regarding persistence?! Is it right to say: no
more concurrent version detection, no 'version' column but state manager
still needed for the immutable instance? Do I miss something?

2nd question : I use 'updatable = false' for my immutable instances, but
could I also use the 'final' Java keyword or JPA wouldn't allow it?

3rd question : If an instance has a List<?> as field, which size is known at
creation time. Could I initialize the List with null values and add 
'updatable = false' for the field?

Thanks a lot for your help and your great job!
nicolas
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