Hibernate: The second-level cache is shared across sessions

// application.yml
spring.jpa.properties.hibernate.cache.use_second_level_cache: true
spring.jpa.properties.hibernate.cache.region.factory_class: jcache

@Entity
@Cacheable
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
class Country { @Id String iso; String name; }

Reference data such as countries is read once per node, not once per request.
Mutable, frequently-written entities are the wrong candidates.