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<h1>JPA com EclipseLink e Jersey</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Neste exemplo, um serviço da web é criado para armazenar e recuperar dados do banco de dados.
<a href="https://jersey.github.io/">Jersey</a> será usado para criar o serviço da web..
Para o banco de dados, o provedor JPA usado será <a href="https://www.eclipse.org/eclipselink/">EclipseLink</a>.</p>
</div>
<div class="paragraph">
<p>O serviço da web irá armazenar e recuperar informações sobre pessoas:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Entity
@XmlRootElement
@NamedQuery(name = "Person.findAll", query = "select p from Person p")
public class Person {
@Id
@GeneratedValue
private long id;
private String name;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Os dois serviços que nosso aplicativo oferece são: persistir uma pessoa, recuperando todas as pessoas do banco de dados:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Singleton
@Lock(LockType.READ)
public class PersonDAO {
@PersistenceContext
private EntityManager em;
public Person save(final String name) {
final Person person = new Person();
person.setName(name);
em.persist(person);
return person;
}
public List&lt;Person&gt; findAll() {
return em.createNamedQuery("Person.findAll", Person.class).getResultList();
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>A seguir, estamos prontos para expor como um serviço esta lógica de negócios:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Path("/person")
@RequestScoped
public class PersonService {
@Inject
private PersonDAO dao;
public PersonService() {
System.out.println();
}
@GET
@Path("/create/{name}")
public Person create(@PathParam("name") final String name) {
return dao.save(name);
}
@GET
@Path("/all")
public List&lt;Person&gt; list() {
return dao.findAll();
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Agora que temos uma classe de serviço, definindo os recursos fornecidos pelo aplicativo, estendemos a classe <code>javax.ws.rs.core.Application</code> e adicionamos nosso <code>PersonService</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">public class JerseyApplication extends Application {
@Override
public Set&lt;Class&lt;?&gt;&gt; getClasses() {
final Set&lt;Class&lt;?&gt;&gt; classes = new HashSet&lt;Class&lt;?&gt;&gt;();
classes.add(PersonService.class);
return classes;
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Há mais uma etapa a ser executada para configurar um servlet fornecido por Jersey.
Isso pode ser feito em <code>webapp/WEB-INF/web.xml</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0"&gt;
&lt;servlet&gt;
&lt;servlet-name&gt;Jersey Web Application&lt;/servlet-name&gt;
&lt;servlet-class&gt;com.sun.jersey.spi.container.servlet.ServletContainer&lt;/servlet-class&gt;
&lt;init-param&gt;
&lt;param-name&gt;javax.ws.rs.Application&lt;/param-name&gt;
&lt;param-value&gt;org.superbiz.service.JerseyApplication&lt;/param-value&gt;
&lt;/init-param&gt;
&lt;load-on-startup&gt;1&lt;/load-on-startup&gt;
&lt;/servlet&gt;
&lt;servlet-mapping&gt;
&lt;servlet-name&gt;Jersey Web Application&lt;/servlet-name&gt;
&lt;url-pattern&gt;/*&lt;/url-pattern&gt;
&lt;/servlet-mapping&gt;
&lt;/web-app&gt;</code></pre>
</div>
</div>
<div class="paragraph">
<p>O serviço da web está pronto para ser testado. Para isso, vamos escrever um teste de unidade usando <a href="http://arquillian.org/">Arquillian</a>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@RunWith(Arquillian.class)
public class JerseyApplicationTest {
@Deployment(testable = false)
public static WebArchive createDeployment() {
return ShrinkWrap.create(WebArchive.class, "jersey-application.war")
.addPackage(JerseyApplication.class.getPackage())
.addPackage(Person.class.getPackage())
.addPackage(PersonDAO.class.getPackage())
.addAsManifestResource(new FileAsset(new File("src/main/webapp/WEB-INF/web.xml")), "web.xml")
.addAsManifestResource(new ClassLoaderAsset("META-INF/persistence.xml"), "persistence.xml")
.addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml");
}
@ArquillianResource
private URL webapp;
@Test
public void test() {
get("person/create/TestPerson");
String allPersons = get("person/all");
assertTrue(allPersons.contains("&lt;name&gt;TestPerson&lt;/name&gt;"));
}
private String get(String url) {
final CloseableHttpClient client = HttpClients.custom().build();
final HttpHost httpHost = new HttpHost(webapp.getHost(), webapp.getPort(), webapp.getProtocol());
final HttpClientContext context = HttpClientContext.create();
final HttpGet get = new HttpGet(webapp.toExternalForm() + url);
CloseableHttpResponse response = null;
try {
response = client.execute(httpHost, get, context);
return EntityUtils.toString(response.getEntity());
} catch (final IOException e) {
throw new IllegalStateException(e);
} finally {
try {
IO.close(response);
} catch (final IOException e) {
// no-op
}
}
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Usamos o Arquillian para iniciar programaticamente um novo container de teste. Em um teste, uma pessoa é persistida e sua presença no banco de dados é verificada recuperando todas as entidades de pessoa.</p>
</div>
<div class="paragraph">
<p>Um exemplo completo pode ser encontrado <a href="https://github.com/apache/tomee/tree/master/examples/tomee-jersey-eclipselink">aqui</a>.
É um projeto maven, e o teste pode ser executado com o comando <code>mvn clean install</code>.</p>
</div>
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<div class="sect1">
<h2 id="_apis_used">APIs Used</h2>
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<li>
<p><a href="../../../master/javadoc/org/apache/openejb/arquillian/common/IO.html">org.apache.openejb.arquillian.common.IO</a></p>
</li>
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<p><a href="../../../jakartaee-8.0/javadoc/javax/annotation/PostConstruct.html">javax.annotation.PostConstruct</a></p>
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<p><a href="../../../jakartaee-8.0/javadoc/javax/persistence/Id.html">javax.persistence.Id</a></p>
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<p><a href="../../../jakartaee-8.0/javadoc/javax/persistence/NamedQuery.html">javax.persistence.NamedQuery</a></p>
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<p><a href="../../../jakartaee-8.0/javadoc/javax/persistence/PersistenceContext.html">javax.persistence.PersistenceContext</a></p>
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<p><a href="../../../jakartaee-8.0/javadoc/javax/transaction/TransactionManager.html">javax.transaction.TransactionManager</a></p>
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<p><a href="../../../jakartaee-8.0/javadoc/javax/xml/bind/annotation/XmlRootElement.html">javax.xml.bind.annotation.XmlRootElement</a></p>
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