JPA Eclipselink
Example jpa-eclipselink can be browsed at
https://github.com/apache/tomee/tree/master/examples/jpa-eclipselink
This example shows how to configure persistence.xml to work with Eclipselink.
It uses an @Entity class and a @Stateful bean to add and delete entities from a
database.
Creating the JPA Entity
The entity itself is simply a pojo annotated with @Entity. We create one pojo called Movie which we
can use to hold movie records.
package org.superbiz.eclipselink;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Movie {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String director;
private String title;
private int year;
public Movie() {
}
public Movie(String director, String title, int year) {
this.director = director;
this.title = title;
this.year = year;
}
public String getDirector() {
return director;
}
public void setDirector(String director) {
this.director = director;
}
public String getTitle() {
1
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
Database Operations
This is the bean responsible for database operations; it allows us to persist or delete entities. For
more information we recommend you to see injection-of-entitymanager
2
package org.superbiz.eclipselink;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.Query;
import java.util.List;
@Stateful
public class Movies {
@PersistenceContext(unitName = "movie-unit", type = PersistenceContextType
.EXTENDED)
private EntityManager entityManager;
public void addMovie(Movie movie) throws Exception {
entityManager.persist(movie);
}
public void deleteMovie(Movie movie) throws Exception {
entityManager.remove(movie);
}
public List<Movie> getMovies() throws Exception {
Query query = entityManager.createQuery("SELECT m from Movie as m");
return query.getResultList();
}
}
Persistence.xml with EclipseLink
configuration
This operation is too easy, just set the provider to org.eclipse.persistence.jpa.PersistenceProvider
and add additional properties to the persistence unit. The example has followed a strategy that
allows the creation of tables in a HSQL database. For a complete list of persistence unit properties
see here
3
<persistence version="1.0"
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="movie-unit">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>movieDatabase</jta-data-source>
<non-jta-data-source>movieDatabaseUnmanaged</non-jta-data-source>
<properties>
<property name="eclipselink.target-database" value=
"org.eclipse.persistence.platform.database.HSQLPlatform"/>
<property name="eclipselink.ddl-generation" value="create-tables"/>
<property name="eclipselink.ddl-generation.output-mode" value="database"/>
</properties>
</persistence-unit>
</persistence>
MoviesTest
Testing JPA is quite easy, we can simply use the EJBContainer API to create a container in our test
case.
4
package org.superbiz.eclipselink;
import junit.framework.TestCase;
import javax.ejb.embeddable.EJBContainer;
import javax.naming.Context;
import java.util.List;
import java.util.Properties;
/**
* @version $Revision: 607077 $ $Date: 2007-12-27 06:55:23 -0800 (Thu, 27 Dec 2007) $
*/
public class MoviesTest extends TestCase {
public void test() throws Exception {
Properties p = new Properties();
p.put("movieDatabase", "new://Resource?type=DataSource");
p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver");
p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb");
final Context context = EJBContainer.createEJBContainer(p).getContext();
Movies movies = (Movies) context.lookup("java:global/jpa-eclipselink/Movies");
movies.addMovie(new Movie("Quentin Tarantino", "Reservoir Dogs", 1992));
movies.addMovie(new Movie("Joel Coen", "Fargo", 1996));
movies.addMovie(new Movie("Joel Coen", "The Big Lebowski", 1998));
List<Movie> list = movies.getMovies();
assertEquals("List.size()", 3, list.size());
for (Movie movie : list) {
movies.deleteMovie(movie);
}
assertEquals("Movies.getMovies()", 0, movies.getMovies().size());
}
}
Running
When we run our test case we should see output similar to the following.
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.eclipselink.MoviesTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
5
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/jpa-eclipselink
INFO - openejb.base = /Users/dblevins/examples/jpa-eclipselink
INFO - Using 'javax.ejb.embeddable.EJBContainer=true'
INFO - Configuring Service(id=Default Security Service, type=SecurityService,
provider-id=Default Security Service)
INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager,
provider-id=Default Transaction Manager)
INFO - Configuring Service(id=movieDatabase, type=Resource, provider-id=Default JDBC
Database)
INFO - Found EjbModule in classpath: /Users/dblevins/examples/jpa-
eclipselink/target/classes
INFO - Beginning load: /Users/dblevins/examples/jpa-eclipselink/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/jpa-eclipselink
INFO - Configuring Service(id=Default Stateful Container, type=Container, provider-
id=Default Stateful Container)
INFO - Auto-creating a container for bean Movies: Container(type=STATEFUL, id=Default
Stateful Container)
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-
id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.eclipselink.MoviesTest:
Container(type=MANAGED, id=Default Managed Container)
INFO - Configuring PersistenceUnit(name=movie-unit,
provider=org.eclipse.persistence.jpa.PersistenceProvider)
INFO - Auto-creating a Resource with id 'movieDatabaseNonJta' of type 'DataSource for
'movie-unit'.
INFO - Configuring Service(id=movieDatabaseNonJta, type=Resource, provider-
id=movieDatabase)
INFO - Adjusting PersistenceUnit movie-unit <non-jta-data-source> to Resource ID
'movieDatabaseNonJta' from 'movieDatabaseUnmanaged'
INFO - Enterprise application "/Users/dblevins/examples/jpa-eclipselink" loaded.
INFO - Assembling app: /Users/dblevins/examples/jpa-eclipselink
INFO - PersistenceUnit(name=movie-unit,
provider=org.eclipse.persistence.jpa.PersistenceProvider) - provider time 511ms
INFO - Jndi(name="java:global/jpa-eclipselink/Movies!org.superbiz.eclipselink.Movies")
INFO - Jndi(name="java:global/jpa-eclipselink/Movies")
INFO -
Jndi(name="java:global/EjbModule225280863/org.superbiz.eclipselink.MoviesTest!org.supe
rbiz.eclipselink.MoviesTest")
INFO - Jndi(name="java:global/EjbModule225280863/org.superbiz.eclipselink.MoviesTest")
INFO - Created Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful
Container)
INFO - Created Ejb(deployment-id=org.superbiz.eclipselink.MoviesTest, ejb-
name=org.superbiz.eclipselink.MoviesTest, container=Default Managed Container)
INFO - Started Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful
Container)
INFO - Started Ejb(deployment-id=org.superbiz.eclipselink.MoviesTest, ejb-
name=org.superbiz.eclipselink.MoviesTest, container=Default Managed Container)
INFO - Deployed Application(path=/Users/dblevins/examples/jpa-eclipselink)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.188 sec
6
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
