JPA: Thread-safety when injecting EntityManagerWhen professionalism comes in to play, so don’t miss it. 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 servlet instance variables is not thread-safe, either. EntityManager is just not designed to be thread-safe. For example, th
