code: protected void displayConcernedElementsAtTheBeginningOfMethod(String methodName, List<String> concernedElements) {
          logger.debug("{}: with {} concernedElements", methodName, concernedElements.size());
          int i = 0;
          for (final String element : concernedElements) {
              i++;
              logger.debug("  element N°{}={}", i, element);
          }
      }
docs: Display message (list of elements) at the beginning of method in logs.
  
  @param methodName
  is name of java method
  @param concernedElements
  is a list of concerned elements (example: authorized activities)