Set up Ehcache 3 as the Hibernate 6 and 7 second level cache: the hibernate-jcache and jakarta Ehcache dependencies, the JCache properties, a minimal ehcache.xml, @Cacheable and @Cache, hit statistics, and the startup error each missing piece causes.
Configure Ehcache 3 for Hibernate 7 with ehcache.xml: one cache per region, templates, ttl/tti expiry, heap and offheap sizing, missing_cache_strategy, concurrency strategies and per-region statistics, all verified by a runnable project.
The Hibernate second level cache shares entity data across all sessions of an EntityManagerFactory. Learn the lookup order, what the cache stores, the concurrency strategies, collection and query caching, statistics and eviction with Hibernate 7.4 and Ehcache 3.
The Hibernate first level cache is the persistence context of one EntityManager. See with counted SQL on Hibernate 7.4 when find() and queries hit the database, how detach(), evict(), clear() and refresh() work, and how to keep long transactions small.
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