I am noticing that across code we use many approaches to encoding UTF-8, all of them slightly wrong :-)

StandardCharsets.UTF_8
Charset.defaultCharset()
CharsetUtil.UTF_8
"UTF-8"

and as additional goodness (?):

 build/classes_subst/ch/loway/oss/ari4java/ARI.java:        
       final String UTF8 = "UTF-8";

My suggestion would be to:

• Define a constant ENCODING in ARI.java that is a Charset and not a String.
• use that constant everywhere (especially where we default to the default encoding!)

Now, should we go for StandardCharsets.UTF_8 or CharsetUtil.UTF_8? what are the pros and cons?