content/meecrowave/meecrowave-jpa/index.html (224 lines of code) (raw):
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<h1 class="doc-title"><span aria-hidden="true" class="icon icon icon_puzzle_alt"></span> Meecrowave JPA</h1>
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<section class="doc-section">
<div id="preamble">
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<p>The overall idea behind this module is to propose a CDI integration of JPA
allowing to programmatically control its persistence units.</p>
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<p>Concretely you will create a persistence unit from a <code>PersistenceUnitBuilder</code>
allowing you to fully configure your unit from CDI context including the datasource:</p>
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<pre class="highlightjs highlight"><code data-lang="java" class="language-java hljs">@ApplicationScoped
public class JpaConfig {
@Produces
public PersistenceUnitInfoBuilder unit(final DataSource ds) {
return new PersistenceUnitInfoBuilder()
.setUnitName("test")
.setDataSource(ds)
.setExcludeUnlistedClasses(true)
.addManagedClazz(User.class)
.addProperty("openjpa.RuntimeUnenhancedClasses", "supported")
.addProperty("openjpa.jdbc.SynchronizeMappings", "buildSchema");
}
}</code></pre>
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<div class="admonitionblock tip">
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if your application uses a single persistence unit this is optional and
a default one will be created if a single DataSource bean is available as Bean<?>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The datasource can be produces as you wish using your own configuration mecanism:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code data-lang="java" class="language-java hljs">@ApplicationScoped
public class JpaConfig {
@Produces // dbcp2 datasource for instance
@ApplicationScoped
public DataSource dataSource() {
final BasicDataSource source = new BasicDataSource();
source.setDriver(new Driver());
source.setUrl("jdbc:h2:mem:jpaextensiontest");
return source;
}
}</code></pre>
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<div class="admonitionblock note">
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it is recommanded to ensure the <code>DataSource</code> is normal-scoped to not get surprises in term of behavior.
</td>
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</div>
<div class="paragraph">
<p>Finally you can inject your entity manager using <code>@Unit</code>. Ensure to
decorate with <code>@Jpa</code> a class/method before using the entity manager to activate
the jpa CDI context:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code data-lang="java" class="language-java hljs">@ApplicationScoped
@Jpa(transactional = false)
public class JPADao {
@Inject
@Unit(name = "test")
private EntityManager em;
@Jpa // with a resource local transaction
public User save(final User user) {
em.persist(user);
return user;
}
// inherit form class, no tx
public User find(final long id) {
return em.find(User.class, id);
}
}</code></pre>
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<div class="admonitionblock important">
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this integration is 100% based on <code>RESOURCE_LOCAL</code> units for now.
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<div class="paragraph">
<p>Not that if a bean get injected an <code>EntityManager</code> it gets automatically <code>@Jpa(transactional=true)</code>
so previous bean is equivalent to:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code data-lang="java" class="language-java hljs">@ApplicationScoped
public class JPADao {
@Inject
@Unit(name = "test")
private EntityManager em;
public User save(final User user) {
em.persist(user);
return user;
}
@Jpa(transactional = false)
public User find(final long id) {
return em.find(User.class, id);
}
}</code></pre>
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<div class="sect1">
<h2 id="_integration_with_bean_validation">Integration with Bean Validation</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The extension will try to find a <code>ValidatorFactory</code> in CDI context and will provide ir to the JPA provider
if the <code>ValidationMode</code> is not <code>NONE</code> and a <code>Bean<ValidatorFactory></code> exists.</p>
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