Athou_commafeed/src/main/resources/META-INF/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="primary">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<jta-data-source>${jpa.datasource.name}</jta-data-source>
		<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>
		<properties>
			<property name="hibernate.hbm2ddl.auto" value="update" />
			<property name="hibernate.show_sql" value="${jpa.show_sql}" />
			<property name="hibernate.dialect" value="${jpa.dialect}" />
			<property name="hibernate.default_batch_fetch_size" value="100" />

			<property name="hibernate.jdbc.batch_size" value="20" />
			<property name="hibernate.order_inserts" value="true" />
			<property name="hibernate.order_updates" value="true" />

			<property name="hibernate.cache.region.factory_class"
				value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" />

			<property name="hibernate.cache.use_second_level_cache"
				value="true" />
			<property name="hibernate.cache.use_query_cache" value="true" />
			<property name="hibernate.generate_statistics" value="true" />
		</properties>
	</persistence-unit>
</persistence>