Using JSF with Entity Relationships - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g - page 329

Add the new Section instance to the ArrayList and flush the changes to
the database:
sectionList.add(section);
em.flush();
Similarly, in the createArticle method create an Article entity object and
persist and flush the entity instance to the database. As the Article entity has
many-to-one relationships with the Edition entity and the Section entity, we
also need to add the Article entity instance to the Edition and Section entities.
The createArticle method has arguments for the edition ID and the section
ID. Retrieve the Edition and Section entity objects using getEditionById and
getSectionById methods and add the Article entity to the Edition and Section
entities as explained for adding a Section entity instance to an Edition entity. The
session bean class EJB3SessionEJBBean is listed as follows:
package model;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
@Stateless(name = "EJB3SessionEJB",
mappedName = "EJB3RelationshipsJSF-Model-EJB3SessionEJB")
@Remote
public class EJB3SessionEJBBean implements EJB3SessionEJB {
@PersistenceContext(unitName = "em")
private EntityManager em;
public EJB3SessionEJBBean() {
}
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public List<Edition> getAllEditions() {
ArrayList<Edition> editions = new ArrayList<Edition>();
Query q = em.createNamedQuery("findEditionsAll");
for (Object edition : q.getResultList()) {
editions.add((Edition) edition);
}
return editions;
}
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)