Hibernate JPA @PersistenceContext Example

@PersistenceContext

The @PersistenceContext annotation is used to specify the EntityManager that needs to be injected as a dependency.

PersistenceContext Expresses a dependency on a container-managed EntityManager and its associated persistence context.

Inject the default EntityManager

@PersistenceContext

private EntityManager em;

To inject a specific Persistence Context, you can use the @PersistenceContext annotation, and you can even pass EntityManager-specific properties using the @PersistenceProperty annotation.

Inject a configurable EntityManager

@PersistenceContext(

    unitName = "CRM",

    properties = {

        @PersistenceProperty(

            name="org.hibernate.flushMode",

            value= "MANUAL"

        )

    }

)

private EntityManager entityManager;