tomee-9.0/examples/tomee-jersey-eclipselink.html - tomee-site-pub - Git at Google

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               <h1>JPA with EclipseLink and Jersey</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div class="paragraph">
 <p>In this example a web service is created that stores and retrieves data from the database.
 <a href="https://jersey.github.io/">Jersey</a> will be used to create the web service.
 For the database, <a href="https://www.eclipse.org/eclipselink/">EclipseLink</a> JPA provider will be used.</p>
 </div>
 <div class="paragraph">
 <p>The web service will store and retrieve information about persons:</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>The two services our application provide are: persisting a person, retrieving all persons from the database:</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>Next, we are ready to expose as a service this business logic:</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>Now, that we have a service class, defining the resources provided by the application, we extent the <code>jakarta.ws.rs.core.Application</code> class and we add our <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>There is one more step to do, to configure a servlet provided by Jersey.
 This can be done in <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;jakarta.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>The web service is ready to be tested. For this, we will write an unit test using <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>We use Arquillian to programmatically start a new test container. In a test a person is persisted, then it&#8217;s presence in database is checked by retrieving all person entities.</p>
 </div>
 <div class="paragraph">
 <p>Full example can be found <a href="https://github.com/apache/tomee/tree/master/examples/tomee-jersey-eclipselink">here</a>.
 It&#8217;s a maven project, and the test can be run with <code>mvn clean install</code> command.</p>
 </div>
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	<div id="main-block" class="container main-block">
	<div class="row title">
	<div class="col-md-12">
	<div class='page-header'>

	<h1>JPA with EclipseLink and Jersey</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div class="paragraph">
	<p>In this example a web service is created that stores and retrieves data from the database.
	<a href="https://jersey.github.io/">Jersey</a> will be used to create the web service.
	For the database, <a href="https://www.eclipse.org/eclipselink/">EclipseLink</a> JPA provider will be used.</p>
	</div>
	<div class="paragraph">
	<p>The web service will store and retrieve information about persons:</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>The two services our application provide are: persisting a person, retrieving all persons from the database:</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<Person> findAll() {
	return em.createNamedQuery("Person.findAll", Person.class).getResultList();
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Next, we are ready to expose as a service this business logic:</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<Person> list() {
	return dao.findAll();
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Now, that we have a service class, defining the resources provided by the application, we extent the <code>jakarta.ws.rs.core.Application</code> class and we add our <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<Class<?>> getClasses() {
	final Set<Class<?>> classes = new HashSet<Class<?>>();
	classes.add(PersonService.class);
	return classes;
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>There is one more step to do, to configure a servlet provided by Jersey.
	This can be done in <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"><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">
	<servlet>
	<servlet-name>Jersey Web Application</servlet-name>
	<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
	<init-param>
	<param-name>jakarta.ws.rs.Application</param-name>
	<param-value>org.superbiz.service.JerseyApplication</param-value>
	</init-param>
	<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
	<servlet-name>Jersey Web Application</servlet-name>
	<url-pattern>/*</url-pattern>
	</servlet-mapping>
	</web-app></code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>The web service is ready to be tested. For this, we will write an unit test using <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("<name>TestPerson</name>"));
	}

	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>We use Arquillian to programmatically start a new test container. In a test a person is persisted, then it’s presence in database is checked by retrieving all person entities.</p>
	</div>
	<div class="paragraph">
	<p>Full example can be found <a href="https://github.com/apache/tomee/tree/master/examples/tomee-jersey-eclipselink">here</a>.
	It’s a maven project, and the test can be run with <code>mvn clean install</code> command.</p>
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