Here is a an example persistence.xml which could be used to test database operations, if you do not want to work against a real database. For example while running an arquillian test case.

 
<?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="myPesistanceUnit" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
      <property name="hibernate.archive.autodetection" value="class"/>
      <property name="hibernate.format_sql" value="true"/>
    </properties>
  </persistence-unit>
   </persistence>

The configured datasource java:jboss/datasources/ExampleDS should already be configured in the standalone.xml of the JBOSS (EAP6 or AS 7).