There's a reason why JDO is the preferred API here. It defines support
for fetch group control, and how far down an object graph the detach
goes. JPA defines nothing of that form, leaving it to implementations
to define what they wish. The only thing you can have with JPA is
define a field as EAGER loading, or to touch the field to force a
load. Use JDO if you want full (automatic) control of such things
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