<?xml version="1.0" encoding="UTF-8"?>
<entity-manager>
   <name>A Name</name>
   <provider>org.hibernate.ejb.HibernatePersistence</provider>
   <properties>
      <property name="hibernate.ejb.cfgfile" value="hibernate.cfg.xml"/>   
      <property name="hibernate.connection.username">xxx</property>
        <property name="hibernate.connection.password">xxx</property>
        <property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
        <property name="hibernate.connection.url">your jdbc connection url</property>
        <property name="hibernate.connection.driver_class">the driver class</property>
      <property name="hibernate.hbm2ddl.auto" value="create-drop"/> -->
        <property name="hibernate.cglib.use_reflection_optimizer">false</property>      
   </properties>
</entity-manager>