1.2. EJB container environment

The most common and widely used entity manager in a Java EE environment is the container-managed entity manager. In this mode, the container is responsible for the opening and closing of the entity manager (this is transparent to the application). It is also responsible for transaction boundaries. A container-managed entity manager is obtained in an application through dependency injection or through JNDI lookup. A container-managed entity manger requires the use of a JTA transaction.