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<h1>Migrate from TomEE 1 to TomEE 7</h1>
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<h2 id="_breaking_changes">Breaking changes</h2>
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<p>Artifact coordinates changes</p>
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<p>GroupId changed from <code>org.apache.openejb</code> to <code>org.apache.tomee</code>.
It includes maven plugins which use now <code>org.apache.tomee.maven</code> and the <code>javaee-api</code>.</p>
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<p>Versions of openejb and tomee are now aligned on 7.x and you don&#8217;t need to use
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<p>JAX-RS 2 specification refined the sorting of providers. It can have side effects for message body
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a json related mediatype. To solve it register a custom provider redefining the media type.</p>
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<p>Can be as easy as:</p>
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<pre class="highlight"><code class="language-java" data-lang="java">@Provider
@Consumes("application/json")
@Produces("application/json")
public class MyAppJsonProvider extends JacksonJsonProvider {
}</code></pre>
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<p>JPA and CDI are linked now, enabling JPA to use CDI for its components but CDI can use JPA too&#8230;&#8203;
to solve issues with hibernate you need to add either as system property or persistence unit <code>tomee.jpa.factory.lazy = true</code>.</p>
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