Is first level cache different from query cache in hibernate? I have seen articles mentioning about first level and query cache, so i am confused.

EntityManager maintains first level cache for retrieved objects, but if you want to have threadsafe aplication you're creating and closing entityManager for each transaction. So whats the point of...

This Hibernate configuration ostensibly should control how many objects are cached in the first level cache. The reason is easy enough to understand, we don't want to run out of memory. But somet...