是的，通常EntityManager或Session绑定到线程(实现为ThreadLocal变量). Spring IoC/CDI可以识别@PersistenceContext批注，并对其进行特殊处理以实现此目的.

Yes, usually the EntityManager or Session are bound to the thread (implemented as a ThreadLocal variable). @PersistenceContext annotation is recognized by Spring IoC/CDI and is treated in a special way to enable this.

您的应用程序中有一层(通常标记为@Transactional)可创建EntityManager并将其绑定到ThreadLocal变量.每次调用第一个@Transactional时都会发生这种情况.同样，每次退出该方法时，EntityManager都会关闭.

There is some layer in your app (usually marked as @Transactional) that creates EntityManager and binds it to the ThreadLocal variable. This happens every time the 1st @Transactional is invoked. And same - EntityManager is closed every time the method exits.

或者，也可以使用OpenSessionInViewInterceptor或OpenSessionInViewFilter来实现.

Alternatively this can be implemented using OpenSessionInViewInterceptor or OpenSessionInViewFilter.