Hi,
it's wired 'cause this is my second post on this forum and for the second time I respond myself.. Guys, I got it!! :-D
The description below are all right (or almost functionally), the problem was in the position of the XML file into deploy and deploy-hasingleton folders.
Here above there's the current position of the file:
[root@sbw01 jms]# pwd
/usr/jboss/jboss-5.1.0.GA/server/all/deploy/jms
[root@sbw01 jms]# ll
total 128
-rw-r--r-- 1 root root 4393 Feb 17 16:18 hajndi-jms-ds.xml
-rw-r--r-- 1 root root 83412 May 22 2009 jms-ra.rar
-rw-r--r-- 1 root root 4057 May 22 2009 messaging-jboss-beans.xml
-rw-r--r-- 1 root root 4822 Feb 17 15:20 messaging-service.xml
-rw-r--r-- 1 root root 12230 Feb 17 15:31 ndb-persistence-service.xml
-rw-r--r-- 1 root root 4152 May 22 2009 remoting-bisocket-service.xml
[root@sbw01 jms]# cd ../../deploy-hasingleton/jms
[root@sbw01 jms]# ll
total 20
-rw-r--r-- 1 root root 6391 Feb 17 15:18 connection-factories-service.xml
-rw-r--r-- 1 root root 6647 Feb 17 16:10 destinations-service.xml
-rw-r--r-- 1 root root 496 May 22 2009 legacy-service.xml
Now seems to be all ok, I've no error or warnings in my logs.
I hope that this could be useful for someone.
Best regards,
Maurizio