$ mvn -o -B test -Dtest=InterceptorTest#globalInterceptorViaSessionFactoryInterceptorProperty_appliesToEverySessionAutomatically
(trimmed to the test's own RESULT line)

RESULT[interceptor-global-via-property]: hibernate.session_factory.interceptor set once at SessionFactory build time -- onSave fired 2 times across 2 independent openSession() calls that never mentioned the interceptor themselves -- this is the mechanism a Spring Boot HibernatePropertiesCustomizer bean uses to register an interceptor application-wide.