Hi,

> I use JBOSS-4.0.0, and i try to use Firebird as DefaultDS for jms
> queues/topics and other internal use. I remove from "default" deploy
> directory all features except:

In case of using Firebird to persist JMS messages you have to specify in
*-jdbc2-service.xml that BLOB_TYPE is BYTES_BLOB, not OBJECT_BLOB.

However, I would not switch to Firebird for JMS persistence, at least not as
default persistence data store. HSQLDB is faster on inserts and I suspect
that it is faster on "findByPrimaryKey" queries, unless you use JayBird with
embedded engine (which is not the case with your configuration).

Roman