code: public String getProviderURL() {
  
          if (providerURL == null) {
              providerURL = getProviderURLPattern().replace("#host#", getHost())
                      .replace("#port#", Integer.toString(getPort()));
          }
          return providerURL;
      }
docs: If null, will build based on host, port and provider url pattern.
  
  @return providerURL
  @see JmsServiceBuilder#providerURL