The jbossts-common.jar jar includes an implementation of the commons-logging Log interface:

[starksm@succubus lib]$ jar -tf jbossts-common.jar | grep Log4
org/apache/commons/logging/impl/Log4JLogger.class

This cannot be included in jars bundled in jbossas as it conflicts with the commons logging classes we bundle with the server. Either this needs to be extracted to a jar that is not included, or simply an external dependency that requires a valid commons logging jar.