Creating an EJB 3.0 Web Service - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g

Java Reference

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Similarly, all the titles may be listed and all the Catalog entity instances may be

listed. An entity instance may be removed using the remove() method. To remove

an entity instance, create the entity instance, merge the entity instance with the

entity manager using the merge() method, and remove the entity instance using the

remove() method:

Catalog catalog2 =new Catalog("Jonas Jacobi", "Nov-Dec 2004",

new Integer(2),"Oracle Magazine", "Oracle Publishing",

"From ADF UIX to JSF");

Catalog c2 = em.merge(catalog2);

em.remove(c2);

em.flush();

Annotate the test() method with the @TransactionAttribute annotation with

type set to REQUIRES_NEW , which implies that a new transaction is created for the

test() method in the session bean:

@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW

The session bean class is listed as follows:

package model;

import java.util.Iterator;

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.EntityManagerFactory;

import javax.persistence.EntityTransaction;

import javax.persistence.FlushModeType;

import javax.persistence.PersistenceContext;

import javax.persistence.PersistenceContextType;

import javax.persistence.PersistenceUnit;

import javax.persistence.Query;

import javax.transaction.UserTransaction;

@Stateless(name = "CatalogSessionEJB", mappedName = "EJB3-SessionEJB")

@Remote

public class CatalogSessionEJBBean implements CatalogSessionEJB {

@PersistenceContext(unitName = "em",

type = PersistenceContextType.TRANSACTION)

EntityManager em;

public CatalogSessionEJBBean() {

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