content/injection-of-entitymanager-example.mdtext

Title: Injection of EntityManager Example

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




<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>



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

If you need to use a TRANSACTION persistence context, see [this example](testing-transactions-example.html)



<a name="InjectionofEntityManagerExample-Writingaunittestfortheexample"></a>
# Writing a unit test for the example

Curious on the InitialContext parameters used?	See the [Injection of DataSource Example](injection-of-datasource-example.html)
 for an explanation of how any Resource can be configured via properties in
the TestCase itself or via an openejb.xml file.

## Movie

    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;
        }
    }

## Movies

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

## persistence.xml

    <persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">
    
      <persistence-unit name="movie-unit">
        <jta-data-source>movieDatabase</jta-data-source>
        <non-jta-data-source>movieDatabaseUnmanaged</non-jta-data-source>
        <class>org.superbiz.injection.jpa.Movie</class>
    
        <properties>
          <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
        </properties>
      </persistence-unit>
    </persistence>
        <!-- END SNIPPET: code -->
    

## MoviesTest

    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<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

    
    -------------------------------------------------------
     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 <non-jta-data-source> 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