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    <p>You can also do this without using subclasses if you use two different persistence units. </p> <p>Each persistence unit can specify a unique set of mappings (including table name). One way to achieve this is to create two orm.xml files. In persistence.xml you'll need something like this :</p> <pre><code>&lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0"&gt; &lt;persistence-unit name="mapping-1"&gt; . . . &lt;mapping-file&gt;orm-1.xml&lt;/mapping-file&gt; . . . &lt;/persistence-unit&gt; &lt;persistence-unit name="mapping-2"&gt; . . . &lt;mapping-file&gt;orm-2.xml&lt;/mapping-file&gt; . . . &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>Then within orm-1.xml : </p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd" version="1.0"&gt; &lt;package&gt;mypackage&lt;/package&gt; &lt;entity name="myEntity" class="myClass"&gt; &lt;table name="TABLE1"&gt; &lt;/table&gt; &lt;/entity&gt; &lt;/entity-mappings&gt; </code></pre> <p>And within orm-2.xml : </p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm orm_1_0.xsd" version="1.0"&gt; &lt;package&gt;mypackage&lt;/package&gt; &lt;entity name="myEntity" class="myClass"&gt; &lt;table name="TABLE2"&gt; &lt;/table&gt; &lt;/entity&gt; &lt;/entity-mappings&gt; </code></pre> <p>You'll need to create a separate EntityManagerFactory for each PersistenceUnit (probably not what you want), but if you wanted to use the same class on different databases (with different table names) this would be a way to go. </p>
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