Did you sign the jar-files? You must also sign the jbossall-client.jar! The files distributed with jboss are not signed by default!
To get "all-permission", every jar-file within the jnlp-file must be signed. All files within one jnlp-file must be signed with the same certificate. If the jar-files are signed by different people, organisations, ... you need to group them according to that in different jnlp-files.