when use the inject EntityManager without specify the unitname?

[mauro2java2011]

i know that for inject a EntityManager i have to write:


@PersistenceContext(unitName = "movie-unit")
    private EntityManager entityManager;

But from examples i have also  found  a  different use:

@PersistenceContex
    private EntityManager entityManager;

when it is possible  use it?




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