@PersistenceContext EntityManager thread-safety in Spring and Java EE

Question

EntityManager is not thread-safe by definition. Servlets specs says that in non-distributed environment and without implementing SingleTh

Answer 1

Question 2, 3, and 4 -- Spring does not pay attention to any class that is not a Spring Bean. Therefor Spring does not pay attention to you MyServlet class. Therefore the answer for

• 2) is no
• 3) only Spring managed Beans
• 4) it is Springs responsibility, because Spring is the Container

For Question 1). It works this way, so the usage of an Spring Injected Entity Manager is effective thread save.