How to inject a spring's service bean into a JPA Entity ?

Programmer Question

My problem is very similar to this one : Injecting fields via Spring into entities loaded by Hibernate

The difference is that , I am using JPA2 entities , not hibernate . While the underlayer is still hibernate (3.5.5).

My spring version is 3.0.4.

What's the corresponding eventListeners in JPA's world ?

Sample code from the original post :

class Student {
   int id; //loaded from DB
   String name; //loaded from DB
   int injectedProperty; //Inject via Spring
   Service serviceImpl; //Inject via Spring
}

I know there may be aspectJ's solutions , but I'd rather like a pure-java solution.
Thanks.

Find the answer here