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    copied!<h2>REVISED (March/2014)</h2> <p>Please take a look at <a href="http://jinahya.wordpress.com/2014/03/29/jpa-metamodels-with-maven/">jpa-metamodels-with-maven</a></p> <h3>Hibernate</h3> <p>Using Hibernate is most recommended.</p> <p>(<em>I'm not judging any features/functions/usabilities/stabilites on those implementations. And the above statement is only focused in maven usage that I constructed.</em>)</p> <pre class="lang-xml prettyprint-override"><code>&lt;plugin&gt; &lt;groupId&gt;org.bsc.maven&lt;/groupId&gt; &lt;artifactId&gt;maven-processor-plugin&lt;/artifactId&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;process&lt;/id&gt; &lt;goals&gt; &lt;goal&gt;process&lt;/goal&gt; &lt;/goals&gt; &lt;phase&gt;generate-sources&lt;/phase&gt; &lt;configuration&gt; &lt;processors&gt; &lt;processor&gt;org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor&lt;/processor&gt; &lt;/processors&gt; &lt;/configuration&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.hibernate&lt;/groupId&gt; &lt;artifactId&gt;hibernate-jpamodelgen&lt;/artifactId&gt; &lt;version&gt;4.3.4.Final&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/plugin&gt; </code></pre> <h3>OpenJPA</h3> <p>OpenJPA seems require additional element <code>&lt;openjpa.metamodel&gt;true&lt;openjpa.metamodel&gt;</code>.</p> <pre class="lang-xml prettyprint-override"><code>&lt;plugin&gt; &lt;groupId&gt;org.bsc.maven&lt;/groupId&gt; &lt;artifactId&gt;maven-processor-plugin&lt;/artifactId&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;process&lt;/id&gt; &lt;goals&gt; &lt;goal&gt;process&lt;/goal&gt; &lt;/goals&gt; &lt;phase&gt;generate-sources&lt;/phase&gt; &lt;configuration&gt; &lt;processors&gt; &lt;processor&gt;org.apache.openjpa.persistence.meta.AnnotationProcessor6&lt;/processor&gt; &lt;/processors&gt; &lt;optionMap&gt; &lt;openjpa.metamodel&gt;true&lt;/openjpa.metamodel&gt; &lt;/optionMap&gt; &lt;/configuration&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.apache.openjpa&lt;/groupId&gt; &lt;artifactId&gt;openjpa&lt;/artifactId&gt; &lt;version&gt;2.3.0&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/plugin&gt; </code></pre> <h3>EclipseLink</h3> <p>EclipseLink requires <code>persistence.xml</code>.</p> <pre class="lang-xml prettyprint-override"><code>&lt;plugin&gt; &lt;groupId&gt;org.bsc.maven&lt;/groupId&gt; &lt;artifactId&gt;maven-processor-plugin&lt;/artifactId&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;process&lt;/id&gt; &lt;goals&gt; &lt;goal&gt;process&lt;/goal&gt; &lt;/goals&gt; &lt;phase&gt;generate-sources&lt;/phase&gt; &lt;configuration&gt; &lt;processors&gt; &lt;processor&gt;org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor&lt;/processor&gt; &lt;/processors&gt; &lt;/configuration&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;org.eclipse.persistence&lt;/groupId&gt; &lt;artifactId&gt;org.eclipse.persistence.jpa.modelgen.processor&lt;/artifactId&gt; &lt;version&gt;2.5.1&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;/plugin&gt; </code></pre> <p><strong>========================================</strong></p> <p>For Apache Maven users,</p> <p>Following simple configuration seems work. (<strong>with old maven-compiler-plugin; updated.</strong>)</p> <pre class="lang-xml prettyprint-override"><code>&lt;!-- This method doesn't work with newest maven-compiler-plugin --&gt; &lt;!-- But if it's ok to work with old maven-compiler-plugin --&gt; &lt;!-- This is the best method --&gt; &lt;!-- There is no other required configurations --&gt; &lt;!-- We don't even require to config any processor names --&gt; &lt;project&gt; &lt;build&gt; &lt;extensions&gt; &lt;extension&gt; &lt;groupId&gt;org.hibernate&lt;/groupId&gt; &lt;artifactId&gt;hibernate-jpamodelgen&lt;/artifactId&gt; &lt;version&gt;1.3.0.Final&lt;/version&gt; &lt;/extension&gt; &lt;/extensions&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt; &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt; &lt;version&gt;2.5.1&lt;/version&gt; &lt;!-- this is critical --&gt; &lt;configuration&gt; &lt;source&gt;1.6&lt;/source&gt; &lt;target&gt;1.6&lt;/target&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre> <p>you can run it with "mvn compiler:compile"</p> <p><strong>UPDATE</strong></p> <p>Note that this method works only with those old maven-compiler-plugin. Check the version in code.</p>
 

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