This is what they use:
static String[] getServiceEntries(String key) {
        List< String > results = null;
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        if (loader == null) {
            return EMPTY_ARRAY;
        }
        Enumeration< URL > urls = null;
        String serviceName = "META-INF/services/" + key;
        try {
            urls = loader.getResources(serviceName);
        } catch (IOException ioe) {
            if (LOGGER.isLoggable(Level.SEVERE)) {
                LOGGER.log(Level.SEVERE,
                           ioe.toString(),
                           ioe);
            }
        }
        if (urls != null) {
            InputStream input = null;
            BufferedReader reader = null;
            while (urls.hasMoreElements()) {
                try {
                    if (results == null) {
                        results = new ArrayList< String >();
                    }
                    URL url = urls.nextElement();
                    URLConnection conn = url.openConnection();
                    conn.setUseCaches(false);
                    input = conn.getInputStream();
                    if (input != null) {
                        try {
                            reader =
                                  new BufferedReader(new InputStreamReader(input,
                                                                           "UTF-8"));
                        } catch (Exception e) {
                            reader =
                                  new BufferedReader(new InputStreamReader(input));
                        }
                        for (String line = reader.readLine();
                             line != null;
                             line = reader.readLine()) {
                            results.add(line.trim());
                        }
                    }
                } catch (Exception e) {
                    if (LOGGER.isLoggable(Level.SEVERE)) {
                        LOGGER.log(Level.SEVERE,
                                   "jsf.spi.provider.cannot_read_service",
                                   new Object[]{serviceName});
                        LOGGER.log(Level.SEVERE,
                                   e.toString(),
                                   e);
                    }
                } finally {
                    if (input != null) {
                        try {
                            input.close();
                        } catch (Exception ignored) {
                        }
                    }
                    if (reader != null) {
                        try {
                            reader.close();
                        } catch (Exception ignored) {
                        }
                    }
                }
            }
        }
        return ((results != null && !results.isEmpty())
                ? results.toArray(new String[results.size()])
                : EMPTY_ARRAY);
}