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Injection of EntityManager Example
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<H1><A name="InjectionofEntityManagerExample-Overview"></A>Overview</H1>
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<P>Shows use of <B>@PersistenceContext</B> to have an <B>EntityManager</B> with an <B>EXTENDED</B> persistence context injected into a @Stateful bean. An EJB 3 <B>@Entity</B> 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" title="Testing Transactions Example">this example</A>.</P>
<P><EM>The source for this example is in the &quot;injection-of-entitymanager&quot; directory located in the <A href="../OPENEJB/download.html" title="Download">openejb-examples.zip</A> available on the download page.</EM></P>
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<H1><A name="InjectionofEntityManagerExample-TheCode"></A>The Code</H1>
<H2><A name="InjectionofEntityManagerExample-TheStatefulbean"></A>The Stateful bean</H2>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java"><SPAN class="code-keyword">import</SPAN> javax.ejb.Stateful;
<SPAN class="code-keyword">import</SPAN> javax.persistence.EntityManager;
<SPAN class="code-keyword">import</SPAN> javax.persistence.PersistenceContext;
<SPAN class="code-keyword">import</SPAN> javax.persistence.PersistenceContextType;
<SPAN class="code-keyword">import</SPAN> javax.persistence.Query;
<SPAN class="code-keyword">import</SPAN> java.util.List;
@Stateful(name = <SPAN class="code-quote">&quot;Movies&quot;</SPAN>)
<SPAN class="code-keyword">public</SPAN> class MoviesImpl <SPAN class="code-keyword">implements</SPAN> Movies {
@PersistenceContext(unitName = <SPAN class="code-quote">&quot;movie-unit&quot;</SPAN>, type = PersistenceContextType.EXTENDED)
<SPAN class="code-keyword">private</SPAN> EntityManager entityManager;
<SPAN class="code-keyword">public</SPAN> void addMovie(Movie movie) <SPAN class="code-keyword">throws</SPAN> Exception {
entityManager.persist(movie);
}
<SPAN class="code-keyword">public</SPAN> void deleteMovie(Movie movie) <SPAN class="code-keyword">throws</SPAN> Exception {
entityManager.remove(movie);
}
<SPAN class="code-keyword">public</SPAN> List&lt;Movie&gt; getMovies() <SPAN class="code-keyword">throws</SPAN> Exception {
Query query = entityManager.createQuery(<SPAN class="code-quote">&quot;SELECT m from Movie as m&quot;</SPAN>);
<SPAN class="code-keyword">return</SPAN> query.getResultList();
}
}
</PRE>
</DIV></DIV>
<H2><A name="InjectionofEntityManagerExample-TheEntitybean"></A>The Entity bean</H2>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java"><SPAN class="code-keyword">import</SPAN> javax.persistence.Entity;
@Entity
<SPAN class="code-keyword">public</SPAN> class Movie {
<SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">String</SPAN> director;
<SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">String</SPAN> title;
<SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">int</SPAN> year;
<SPAN class="code-keyword">public</SPAN> Movie() {
}
<SPAN class="code-keyword">public</SPAN> Movie(<SPAN class="code-object">String</SPAN> director, <SPAN class="code-object">String</SPAN> title, <SPAN class="code-object">int</SPAN> year) {
<SPAN class="code-keyword">this</SPAN>.director = director;
<SPAN class="code-keyword">this</SPAN>.title = title;
<SPAN class="code-keyword">this</SPAN>.year = year;
}
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-object">String</SPAN> getDirector() {
<SPAN class="code-keyword">return</SPAN> director;
}
<SPAN class="code-keyword">public</SPAN> void setDirector(<SPAN class="code-object">String</SPAN> director) {
<SPAN class="code-keyword">this</SPAN>.director = director;
}
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-object">String</SPAN> getTitle() {
<SPAN class="code-keyword">return</SPAN> title;
}
<SPAN class="code-keyword">public</SPAN> void setTitle(<SPAN class="code-object">String</SPAN> title) {
<SPAN class="code-keyword">this</SPAN>.title = title;
}
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-object">int</SPAN> getYear() {
<SPAN class="code-keyword">return</SPAN> year;
}
<SPAN class="code-keyword">public</SPAN> void setYear(<SPAN class="code-object">int</SPAN> year) {
<SPAN class="code-keyword">this</SPAN>.year = year;
}
}
</PRE>
</DIV></DIV>
<H2><A name="InjectionofEntityManagerExample-Thepersistenceunit"></A>The persistence unit</H2>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-xml"><SPAN class="code-tag">&lt;persistence xmlns=<SPAN class="code-quote">&quot;http://java.sun.com/xml/ns/persistence&quot;</SPAN> version=<SPAN class="code-quote">&quot;1.0&quot;</SPAN>&gt;</SPAN>
<SPAN class="code-tag">&lt;persistence-unit name=<SPAN class="code-quote">&quot;movie-unit&quot;</SPAN>&gt;</SPAN>
<SPAN class="code-tag">&lt;jta-data-source&gt;</SPAN>movieDatabase<SPAN class="code-tag">&lt;/jta-data-source&gt;</SPAN>
<SPAN class="code-tag">&lt;non-jta-data-source&gt;</SPAN>movieDatabaseUnmanaged<SPAN class="code-tag">&lt;/non-jta-data-source&gt;</SPAN>
<SPAN class="code-tag">&lt;class&gt;</SPAN>org.superbiz.injection.jpa.Movie<SPAN class="code-tag">&lt;/class&gt;</SPAN>
<SPAN class="code-tag">&lt;properties&gt;</SPAN>
<SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;openjpa.jdbc.SynchronizeMappings&quot;</SPAN> value=<SPAN class="code-quote">&quot;buildSchema(ForeignKeys=true)&quot;</SPAN>/&gt;</SPAN>
<SPAN class="code-tag">&lt;/properties&gt;</SPAN>
<SPAN class="code-tag">&lt;/persistence-unit&gt;</SPAN>
<SPAN class="code-tag">&lt;/persistence&gt;</SPAN>
</PRE>
</DIV></DIV>
<H1><A name="InjectionofEntityManagerExample-Writingaunittestfortheexample"></A>Writing a unit test for the example</H1>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class MoviesTest <SPAN class="code-keyword">extends</SPAN> TestCase {
<SPAN class="code-keyword">public</SPAN> void test() <SPAN class="code-keyword">throws</SPAN> Exception {
Properties p = <SPAN class="code-keyword">new</SPAN> Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY, <SPAN class="code-quote">&quot;org.apache.openejb.client.LocalInitialContextFactory&quot;</SPAN>);
p.put(<SPAN class="code-quote">&quot;movieDatabase&quot;</SPAN>, <SPAN class="code-quote">&quot;<SPAN class="code-keyword">new</SPAN>:<SPAN class="code-comment">//Resource?type=DataSource&quot;</SPAN>);
</SPAN> p.put(<SPAN class="code-quote">&quot;movieDatabase.JdbcDriver&quot;</SPAN>, <SPAN class="code-quote">&quot;org.hsqldb.jdbcDriver&quot;</SPAN>);
p.put(<SPAN class="code-quote">&quot;movieDatabase.JdbcUrl&quot;</SPAN>, <SPAN class="code-quote">&quot;jdbc:hsqldb:mem:moviedb&quot;</SPAN>);
p.put(<SPAN class="code-quote">&quot;movieDatabaseUnmanaged&quot;</SPAN>, <SPAN class="code-quote">&quot;<SPAN class="code-keyword">new</SPAN>:<SPAN class="code-comment">//Resource?type=DataSource&quot;</SPAN>);
</SPAN> p.put(<SPAN class="code-quote">&quot;movieDatabaseUnmanaged.JdbcDriver&quot;</SPAN>, <SPAN class="code-quote">&quot;org.hsqldb.jdbcDriver&quot;</SPAN>);
p.put(<SPAN class="code-quote">&quot;movieDatabaseUnmanaged.JdbcUrl&quot;</SPAN>, <SPAN class="code-quote">&quot;jdbc:hsqldb:mem:moviedb&quot;</SPAN>);
p.put(<SPAN class="code-quote">&quot;movieDatabaseUnmanaged.JtaManaged&quot;</SPAN>, <SPAN class="code-quote">&quot;<SPAN class="code-keyword">false</SPAN>&quot;</SPAN>);
Context context = <SPAN class="code-keyword">new</SPAN> InitialContext(p);
Movies movies = (Movies) context.lookup(<SPAN class="code-quote">&quot;MoviesLocal&quot;</SPAN>);
movies.addMovie(<SPAN class="code-keyword">new</SPAN> Movie(<SPAN class="code-quote">&quot;Quentin Tarantino&quot;</SPAN>, <SPAN class="code-quote">&quot;Reservoir Dogs&quot;</SPAN>, 1992));
movies.addMovie(<SPAN class="code-keyword">new</SPAN> Movie(<SPAN class="code-quote">&quot;Joel Coen&quot;</SPAN>, <SPAN class="code-quote">&quot;Fargo&quot;</SPAN>, 1996));
movies.addMovie(<SPAN class="code-keyword">new</SPAN> Movie(<SPAN class="code-quote">&quot;Joel Coen&quot;</SPAN>, <SPAN class="code-quote">&quot;The Big Lebowski&quot;</SPAN>, 1998));
List&lt;Movie&gt; list = movies.getMovies();
assertEquals(<SPAN class="code-quote">&quot;List.size()&quot;</SPAN>, 3, list.size());
<SPAN class="code-keyword">for</SPAN> (Movie movie : list) {
movies.deleteMovie(movie);
}
assertEquals(<SPAN class="code-quote">&quot;Movies.getMovies()&quot;</SPAN>, 0, movies.getMovies().size());
}
}
</PRE>
</DIV></DIV>
<P>Curious on the InitialContext parameters used? See the <A href="injection-of-datasource-example.html" title="Injection of DataSource Example">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>
<H1><A name="InjectionofEntityManagerExample-Running"></A>Running</H1>
<P>Running the example is fairly simple. In the &quot;injection-of-entitymanager&quot; directory of the <A href="../OPENEJB/download.html" title="Download">examples zip</A>, just run:</P>
<P>$ mvn clean install</P>
<P>Which should create output like the following.</P>
<DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent">
<PRE>-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.injection.jpa.MoviesTest
Apache OpenEJB 3.0 build: 20080408-04:13
http://openejb.apache.org/
INFO - openejb.home = /Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager
INFO - openejb.base = /Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager
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=movieDatabaseUnmanaged, type=Resource, provider-id=Default JDBC Database)
INFO - Configuring Service(id=movieDatabase, type=Resource, provider-id=Default JDBC Database)
INFO - Configuring Service(id=Default JDK 1.3 ProxyFactory, type=ProxyFactory, provider-id=Default JDK 1.3 ProxyFactory)
INFO - Found EjbModule in classpath: /Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager/target/classes
INFO - Configuring app: /Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager/target/classes
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 PersistenceUnit(name=movie-unit)
INFO - Loaded Module: /Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager/target/classes
INFO - Assembling app: /Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager/target/classes
INFO - PersistenceUnit(name=movie-unit, provider=org.apache.openjpa.persistence.PersistenceProviderImpl)
ERROR - JAVA AGENT NOT INSTALLED. The JPA Persistence Provider requested installation of a ClassFileTransformer which requires
a JavaAgent. See http://openejb.apache.org/3.0/javaagent.html
INFO - Jndi(name=MoviesLocal) --&gt; Ejb(deployment-id=Movies)
INFO - Created Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container)
INFO - Deployed Application(path=/Users/dblevins/work/openejb-3.0/examples/injection-of-entitymanager/target/classes)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.095 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
</PRE>
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