JPA: Thread-safety when injecting EntityManager EntityManagerFactory is guaranteed to be thread-safe...

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JPA: Thread-safety when injecting EntityManager

EntityManagerFactory is guaranteed to be thread-safe, EntityManager is not.

@PersistenceUnit

private EntityManagerFactory emf;

EntityManager em = emf.createEntityManager();

@PersistenceContext

EntityManager em;

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As I wrote in post Why we need type-level injections in JavaEE, injecting EJB 3 stateful beans into servlet instance fields is not thread-safe. Along the same line, injecting EntityManager with @PersistenceContext into servle...

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