Ok, I managed to deal with it.
This is basically what I did:
- create a sar folder, with all my jar, as suggested by Bruno Melloni
- create a META-INF/jboss-service.xml in it, containing a new classpath:
<service>
<classpath codebase='.' archives='*' />
</service>
- in META-INF/ I also put all my *.properties files
This way it looks like everything is fine.
Thank you all for your help, hope this solution helps someone else too.