@Override
  public Object getNegotiatedProperty(String propName) {
    return 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).
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/MetaStorePlainSaslServer.java