Its not good practice to do this (I'm sure Gavin has some blogs on this, so go
look on http://in.relation.to) but if you have to you would have to look up the
EM programatically.
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I use @Formula. It requires compile time instrumentation for lazy loading and
will not load collections unless you use hibernate mapping files. It works
fine with calculated properties and annotations as shown below.
See:
http://opensource.atlassian.com/projects/hibernate/browse/ANN-210
It
