创建位于META中的persistence.xml文件-INF文件夹。

Create a persistence.xml file that resides in the META-INF folder.

示例：

<persistence 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"
         version="2.0">
<persistence-unit name="sample">
  <provider>org.hibernate.ejb.HibernatePersistence</provider>
  <jta-data-source>java:/DefaultDS</jta-data-source>
  <mapping-file>ormap.xml</mapping-file>
  <jar-file>MyApp.jar</jar-file>
  <class>org.acme.Employee</class>
  <class>org.acme.Person</class>
  <class>org.acme.Address</class>
  <properties>
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
     <property name="hibernate.connection.password">XXXXXX</property>
     <property name="hibernate.connection.url">jdbc:mysql://<hostname>/<database></property>
     <property name="hibernate.connection.username">XXXXX</property>
     <property name="hibernate.default_schema">XXXXXX</property>
     <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
   </properties>
  </persistence-unit>
</persistence>