Finally I was able to deploy my application without using the admin console. When copying the war file in the deploy folder, I have no errors. I am still having the same problems when I try to deploy the application using the admin console page.
So problem solved? Not really but I can finally use my app. I am still wondering what is the problem with the inventory manager. Moreover, why is a jBoss 5 class used in jBoss 6?
Thanks for the answers.