I tried, but in a test setup it worked. However, I get the same Exceptions when I try to just do Criteria.list. So it seems to be a problem using the second level cache and not in the mapping.

org.hibernate.event.internal.DefaultLoadEventListener.getFromSharedCache(DefaultLoadEventListener.java:645):

		final Object ck = cache.generateCacheKey(
				event.getEntityId(),
				persister,
				source.getFactory(),
				source.getTenantIdentifier()
		);

Either LoadEvent, SessionImplementor or EntityDataAccess has to be null, but I don't understand what I could have done wrong. Is there any configuration change I missed? Of course I read the migration guide, tried using JCache+the latest ehcache instead of hibernate-ehcache - but to no avail.