org.hibernate .SessionFactory.evict(Class persistentClass, Serializable id):
Is this method removes from the 2L cache only the object identified by parameters or the whole object tree associated with it?

Vlad,

That method removes from the 2L cache only the object identified by the id parameter.

If that object references others, the gc wil take them (including the evicted object). Any way you don't have to worry, if you can reference any of those objects (usually) you could still use them. If you cant (usually) the gc will take care of them.

Emilio

Sorry, I did not get it.
In my previous post I mean the "whole object tree" consisting of cached objects ("with cache usage" enabled).
I probably, should have given more detailed description in my previous posting.
I have an object cached by L2 cache. This object references other objects.
All the referenced objects are cache enabled ("cache usage = "...etc)
At a certain point I would like to clean the cache from the object and other objects it references.
How gc can remove them from L2 cache?

Vlad,

Gc does not remove an object from cache, the cahce itself disposes it, only then the gc takes care of it.

The cache dispose policy and times can be configured by you.

But if you want a whole set of objects to be removed from the cache I think you should do it by hand or wait for them to expire.

Emilio