I'm wondering if the elements of a collection loaded using a "fetch join" are put in the cache (JCS) ?

From the reference documentation:

Will the cat.kittens elements be stored in the cache ?

Thx

Yes, why?


Do you think its not working?

No, but I couldn't find the answer in the documentation.

I made a test in the meantime, and it is actually working.
Unless you try to join fetch two collections in the same query (but the documentation says it is not working for the moment ;-)

I'm actually trying to preload my caches with a backgroung thread. Loading all entites is not a problem:


But when it comes to preload the relationships/collections, the only way I found was:



Works fine until the <entity> has more than one collection. In this situation, a single HSQL query loading the entity and fetching all its relations at once is not possible. I end-up doing the following:


Although it loads the entities twice, it is actually faster than iterating through the entities and initializing the <role2> collection for each (using <role2>.size() or Hibernate.initialize(<role2>).

Is there any other better way to preload these collections?
The bottom line is I'd like to preload an entire graph of objects into memory...

I always counsel against doing cartesian products like this. It is unscalable as the size of the collections increases.


If you *must*, you can do:


from Foo
left join foo.bars bar
left join foo.fums fum


and get them all out of the returned array.


P.S. The syntax is actually "join fetch", not "fetch join".