persistence.xml

<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="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
              <provider>org.hibernate.ejb.HibernatePersistence</provider>
              <non-jta-data-source>DefaultDS</non-jta-data-source>
              <properties>
                     <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
                     <!--<property name="hibernate.show_sql" value="true"/>-->
                     <property name="hibernate.hbm2ddl.auto" value="update"/>
                     <property name="hibernate.format_sql" value="true"/>
              </properties>
       </persistence-unit>