docs: public <X, PP extends MessagePathParameter<X>> X getPathParameter(Class<PP> parameterClass) {
  		@SuppressWarnings("unchecked")
  		PP pathParameter = (PP) pathParameters.get(parameterClass);
  		Preconditions.checkState(pathParameter != null, "No parameter could be found for the given class.");
  		return pathParameter.getValue();
  	}