JWT

TimeZone tz = TimeZone.getTimeZone("UTC");
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mmZ");
df.setTimeZone(tz);
String nowAsISO = df.format(new Date());

HashMap<String, String> keyValues = new HashMap<String, String>();
keyValues.put("consumerKey", this.annotatorKey);
keyValues.put("userId", this.userId);
keyValues.put("issuedAt", nowAsISO);
keyValues.put("ttl", "60000");

JWTUtils jwtutil = new JWTUtils(this.userId, this.annotatorKey, this.annotatorSecret);
String signedToken = "";
try {
    JsonToken token = jwtutil.createToken(keyValues);
    signedToken = token.serializeAndSign();
} catch (InvalidKeyException e) {
    e.printStackTrace();
} catch (SignatureException e) {
    e.printStackTrace();
}

resp.setContentType("text/plain");
PrintWriter out = resp.getWriter();
out.println(signedToken);