persistence.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.1"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
	<persistence-unit name="my-persistence-unit">
		...

		<properties>
			...

			<!--  configure caching -->
			<property name="hibernate.cache.use_query_cache" value="true"/>	
			<property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"/>
		</properties>
	</persistence-unit>
</persistence>

TestQueryCache.java

Session s = (Session) em.getDelegate();
		Query q = s.createQuery("SELECT a FROM Author a WHERE id = :id");
		q.setParameter("id", 1L);
		q.setCacheable(true);
log.info(q.uniqueResult());