Замена @Autowired на @PersistenceContext #36
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…create a unique EntityManager for every transaction (communication with the database). https://stackoverflow.com/questions/31335211/autowired-vs-persistencecontext-for-entitymanager-bean
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Привет, Максим! Посмотри пожалуйста мой коммит. @Malcom1986 |
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Приветствую, Александр! Спасибо, я поисследую этот момент. А подскажите пожалуйста, почему такой вопрос возник? Вы какую-то ошибку получили или просто в глаза бросилось? |
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В документации, туторилах, статьях пишут о том что необходимо воспользоваться аннотацией @PersistenceContext
private EntityManager entityManager;Студенты спрашивают зачем в эталонном проекте используется |
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Не стоит использовать @Autowired потому, что он создает только один экземпляр EntityManager для всего приложения. @PersistenceContext создает новый экземпляр EntityManager для каждой транзакции.
Подробнее:
https://stackoverflow.com/questions/31335211/autowired-vs-persistencecontext-for-entitymanager-bean