code: public String getUserResourceInstanceUri(final String path, final String instanceId){
          if(StringUtils.isEmpty(path) || StringUtils.isEmpty(instanceId)) {
              throw new IllegalArgumentException("Path and Instance Id cannot be null");
          }
          return getUserResourceUri(path) + "/" + instanceId;
      }
docs: Convenience method that returns the resource instance uri. E.g.
  
  @param path the path.
  @param instanceId the instance id.
  @return The user Instance URI.