CODEWITHSUNDEEP
hibernatejpa
Robert Strauch
Robert Strauch

Reputation: 12876

Injecting an EntityManager using @PersistenceContext

We're currently using a problematic setup of our EntityManager like in the following. We'd like to change from @PersistenceUnit to @PersistenceContext for the entity mangager. How can we use the same @Inject mechanism?

persistence.xml:

<persistence-unit name="my-data-source" transaction-type="JTA">
    <jta-data-source>java:/foo/model</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
        <property name="hibernate.show_sql" value="${hibernate.show_sql:false}"/>
        <property name="hibernate.format_sql" value="true" />
        <property name="hibernate.use_sql_comments" value="true" />
        <property name="hibernate.order_inserts" value="true" />
        <property name="hibernate.order_updates" value="true" />
        <property name="hibernate.jdbc.batch_versioned_data" value="true" />
        <property name="hibernate.jdbc.batch_size" value="30" />
        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL57InnoDBDialect" />
    </properties>
</persistence-unit>

That's how we get the entity manager:

@Stateless
public class EntityManagerProvider {

    @PersistenceUnit(unitName = "my-data-source")
    private EntityManagerFactory emFactory;

    @Produces
    @Default
    public EntityManager getDefaultEntityManager() {
        return emFactory.createEntityManager();
    }

}

And within the application we inject the entity manager like this:

@Inject
private EntityManager entityManager;

Upvotes: 0

Views: 866

Answers (2)

Md. Sajedul Karim
Md. Sajedul Karim

Reputation: 7045

Your code is like bellow:

@PersistenceContext
private EntityManager entityManager;

Here import's are given bellow :

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

For more info, check this answer

Upvotes: 1

Ismail
Ismail

Reputation: 2952

I think you can just call it like this, of course without calling EntityManagerFactory:

@PersistenceContext
EntityManager em;

In this case the container will handle the life cycle of the entity manager bean, so you don't need to call EntityManagerFactroy.

Upvotes: 1

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