When does hibernate use its first level cache ? how to log it?

Question

Is there a simple way with hibernate log level to see when the first cache level is used or not ?

If I'm doing the following hql request : "from Document d left join fetch d.folder where d.id=2"; several time, in the same session, will the cache be used ?

Thanks

score 2 · Accepted Answer · edited May 23 '17 at 12:16

2

Hibernate L1 cache stores entities by primary key. This means that if you load the same entity using load() or get() (I think this also applies to simple queries like: from Document d where d.id=2) it will be cached.

In your case the query is a bit more complicated and you will have to use L2. Unfortunately there is no logger indicating L1 activity (at least not documented) but seeing SQL queries shouls be enough.

What about queries with a left join fetch on another entity ? thanks for the link – Quentin Feb 14 '12 at 10:53
@Quentin: I believe you will have to fall back to L2 cache in this case. – Tomasz Nurkiewicz Feb 14 '12 at 10:55
Ok, do you know how can I log it (or which class is in charge of this cache), just to make sure ? – Quentin Feb 14 '12 at 10:58
@Quentin: no, unfortunately, I am mentioning about L1 cache in my answer. – Tomasz Nurkiewicz Feb 14 '12 at 11:41

When does hibernate use its first level cache ? how to log it?

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