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public static String getAction(Extensible ext) {
    Object o = ext.getExtensionAttribute(JAXWSAConstants.WSAW_ACTION_QNAME);
    if (o == null) {
        o = ext.getExtensionAttributes().get(new QName(Names.WSA_NAMESPACE_WSDL_METADATA,
                                                       Names.WSAW_ACTION_NAME));
    }
    if (o == null) {
        o = ext.getExtensionAttributes().get(new QName(Names.WSA_NAMESPACE_WSDL_NAME_OLD,
                                               Names.WSAW_ACTION_NAME));
    }
    if (o instanceof QName) {
        return ((QName)o).getLocalPart();
    }
    return o.toString(); // <=== fails here
}

This is known/expected issue. CXF 2.2.8 (currently in use)

doesn't implement JAX-WS 2.2 yet. This should be fixed soon in upcomming CXF releases.