Decode JWT in Java without the secret using JJWT

gistfile1.txt

String token = Jwts.builder()
        .setExpiration(new Date())
        .setSubject("Joe")
        .signWith(SignatureAlgorithm.HS512, MacProvider.generateKey())
        .compact();

System.out.println(token);

String[] pieces = token.split("\\.");

System.out.println(pieces[1]);

try {
    System.out.println(new String(DatatypeConverter.parseBase64Binary(pieces[1]), "UTF-8"));
} catch (UnsupportedEncodingException ex) {
}