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    <h1>Injection of EntityManager Example

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<p><a name="InjectionofEntityManagerExample-Overview"></a></p>

<h1>Overview</h1>

<p><object width="400" height="250"><param name="movie"
value="http://www.youtube.com/v/s4uiIoAehgQ?fs=1&amp;hl=en_US&amp;rel=0"></param><param
name="allowFullScreen" value="true"></param><param name="allowscriptaccess"
value="always"></param><embed
src="http://www.youtube.com/v/s4uiIoAehgQ?fs=1&amp;hl=en_US&amp;rel=0"
type="application/x-shockwave-flash" allowscriptaccess="always"
allowfullscreen="true" width="400" height="250"></embed></object></p>

<p>Shows use of <em>@PersistenceContext</em> to have an <em>EntityManager</em> with an
<em>EXTENDED</em> persistence context injected into a @Stateful bean.  An EJB 3
<em>@Entity</em> bean is used with the EntityManager to create, persist and merge
data to a database.</p>

<p>If you need to use a TRANSACTION persistence context, see <a href="testing-transactions-example.html">this example</a></p>

<p><a name="InjectionofEntityManagerExample-Writingaunittestfortheexample"></a></p>

<h1>Writing a unit test for the example</h1>

<p>Curious on the InitialContext parameters used?  See the <a href="injection-of-datasource-example.html">Injection of DataSource Example</a>
 for an explanation of how any Resource can be configured via properties in
the TestCase itself or via an openejb.xml file.</p>

<h2>Movie</h2>

<pre><code>package org.superbiz.injection.jpa;
//START SNIPPET: code

import javax.persistence.Entity;

@Entity
public class Movie {

    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() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }
}
</code></pre>

<h2>Movies</h2>

<pre><code>package org.superbiz.injection.jpa;

//START SNIPPET: code

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&lt;Movie&gt; getMovies() throws Exception {
        Query query = entityManager.createQuery("SELECT m from Movie as m");
        return query.getResultList();
    }
}
</code></pre>

<h2>persistence.xml</h2>

<pre><code>&lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"&gt;

  &lt;persistence-unit name="movie-unit"&gt;
    &lt;jta-data-source&gt;movieDatabase&lt;/jta-data-source&gt;
    &lt;non-jta-data-source&gt;movieDatabaseUnmanaged&lt;/non-jta-data-source&gt;
    &lt;class&gt;org.superbiz.injection.jpa.Movie&lt;/class&gt;

    &lt;properties&gt;
      &lt;property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/&gt;
    &lt;/properties&gt;
  &lt;/persistence-unit&gt;
&lt;/persistence&gt;
    &lt;!-- END SNIPPET: code --&gt;
</code></pre>

<h2>MoviesTest</h2>

<pre><code>package org.superbiz.injection.jpa;

import junit.framework.TestCase;

import javax.ejb.embeddable.EJBContainer;
import javax.naming.Context;
import java.util.List;
import java.util.Properties;

//START SNIPPET: code
public class MoviesTest extends TestCase {

    public void test() throws Exception {

        final 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/injection-of-entitymanager/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&lt;Movie&gt; list = movies.getMovies();
        assertEquals("List.size()", 3, list.size());

        for (Movie movie : list) {
            movies.deleteMovie(movie);
        }

        assertEquals("Movies.getMovies()", 0, movies.getMovies().size());
    }
}
</code></pre>

<h1>Running</h1>

<pre><code>-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.superbiz.injection.jpa.MoviesTest
Apache OpenEJB 4.0.0-beta-1    build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/injection-of-entitymanager
INFO - openejb.base = /Users/dblevins/examples/injection-of-entitymanager
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/injection-of-entitymanager/target/classes
INFO - Beginning load: /Users/dblevins/examples/injection-of-entitymanager/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/injection-of-entitymanager
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.injection.jpa.MoviesTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Configuring PersistenceUnit(name=movie-unit)
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 &lt;non-jta-data-source&gt; to Resource ID 'movieDatabaseNonJta' from 'movieDatabaseUnmanaged'
INFO - Enterprise application "/Users/dblevins/examples/injection-of-entitymanager" loaded.
INFO - Assembling app: /Users/dblevins/examples/injection-of-entitymanager
INFO - PersistenceUnit(name=movie-unit, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 462ms
INFO - Jndi(name="java:global/injection-of-entitymanager/Movies!org.superbiz.injection.jpa.Movies")
INFO - Jndi(name="java:global/injection-of-entitymanager/Movies")
INFO - Jndi(name="java:global/EjbModule1461341140/org.superbiz.injection.jpa.MoviesTest!org.superbiz.injection.jpa.MoviesTest")
INFO - Jndi(name="java:global/EjbModule1461341140/org.superbiz.injection.jpa.MoviesTest")
INFO - Created Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container)
INFO - Created Ejb(deployment-id=org.superbiz.injection.jpa.MoviesTest, ejb-name=org.superbiz.injection.jpa.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.injection.jpa.MoviesTest, ejb-name=org.superbiz.injection.jpa.MoviesTest, container=Default Managed Container)
INFO - Deployed Application(path=/Users/dblevins/examples/injection-of-entitymanager)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.301 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
</code></pre>


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