Persistence Unit (persistence.xml) from my blog post, 'Java RESTful Web Services Using MySQL Server, EclipseLink, and Jersey': http://wp.me/p1RD28-Cf

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
  <persistence-unit name="MySQLDemoServicePU" transaction-type="JTA">
    <jta-data-source>jdbc/mysql_sakila</jta-data-source>
    <class>com.mysql.entities.Actor</class>
    <class>com.mysql.entities.ActorInfo</class>
    <class>com.mysql.entities.Film</class>
    <class>com.mysql.entities.FilmActor</class>
    <class>com.mysql.entities.Language</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties/>
  </persistence-unit>
</persistence>