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shared cache is not applicable for container managed entity manager?

 
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Hi,
In chapter 12 of JPA Pro, Shared Cache section:


The shared cache is manipulated in JPA through a slim javax.persistence.Cache interface. An object that implements Cache can be obtained from the entity manager factory by invoking EntityManagerFactory.getCache()....



Sample code:

So, if the entity manager is not created by the entity manager, does it mean shared cache is not applicable ?

 
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