@Override
  public boolean isComplete() {
    return user != null;
  }
Sun JDK only provides a PLAIN client and no server. This class implements the Plain SASL server
conforming to RFC #4616 (http://www.ietf.org/rfc/rfc4616.txt).
service/src/java/org/apache/hive/service/auth/PlainSaslServer.java