There is a serious log message which don't support localization: jboss-eap-6.3-src/ejb3/src/main/java/org/jboss/as/ejb3/tx/CMTTxInterceptor.java 169 EjbLogger.ROOT_LOGGER.error(t);
Just needs a backport of the patch for WFLY-2964.
Verified with EAP 6.4.0.DR2.