code: public Object getConnection(Subject subject,
        ConnectionRequestInfo cxRequestInfo) throws ResourceException {
      log.finest("getConnection()");
      this.vertxConn = new VertxConnectionImpl(this);
      return vertxConn;
    }
docs: Creates a new connection handle for the underlying physical connection
  represented by the ManagedConnection instance.
  
  @param subject
  Security context as JAAS subject
  @param cxRequestInfo
  ConnectionRequestInfo instance
  @return generic Object instance representing the connection handle.
  @throws ResourceException
  generic exception if operation fails