URL Encoding with Charset.defaultCharset() doesn't really make sense

RestProxyServicePlugin.java has the following:

// Make sure that it is URL encoded correctly, except for the '/' and ':' characters
normalizedPingServiceUri = URLEncoder.encode(pingServiceUri, Charset.defaultCharset().name())
.replaceAll("%2F", "/").replaceAll("%3A", ":");

Note that it uses 'Charset.defaultCharset().name() instead of one of the standard charsets such as ISO-8859-1 or UTF-8.
In my local env, Charset.defaultCharset().name() returns 'MacRoman'.
Even if this doesn't make a problem for now, I think it should have used either 'UTF-8' or 'ISO-8859-1' or removed #encode() call (the replaceAll() calls doesn't look neat).

[1] http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html