docs: public static String[] addConfigurationClasses(String[] configurationClasses, AdditionalWebAppJettyConfigurationClass[] optionalAdditionalsWebappConfigurationClasses) {
          List<String> newConfigurationClasses = new ArrayList<>(Arrays.asList(configurationClasses));
          
          for (AdditionalWebAppJettyConfigurationClass additionalWebappConfigurationClass : optionalAdditionalsWebappConfigurationClasses) {
              if (additionalWebappConfigurationClass.getClasses() == null || additionalWebappConfigurationClass.getPosition() == null) {
                  LOG.warn("Bad support class name");
              } else {
                  if (ClassUtil.classesExists(additionalWebappConfigurationClass.getClasses())) {
                      int index = 0;
                      
                      if (additionalWebappConfigurationClass.getReferenceClass() == null) {
                          if (additionalWebappConfigurationClass.getPosition() == Position.AFTER) {
                              index = newConfigurationClasses.size();
                          }
                      } else {
                          index = newConfigurationClasses.indexOf(additionalWebappConfigurationClass.getReferenceClass());
                          
                          if (index == -1) {
                              if (additionalWebappConfigurationClass.getPosition() == Position.AFTER) {
                                  LOG.warn("[{}] reference unreachable, add at the end", additionalWebappConfigurationClass.getReferenceClass());
                                  index = newConfigurationClasses.size();
                              } else {
                                  LOG.warn("[{}] reference unreachable, add at the top", additionalWebappConfigurationClass.getReferenceClass());
                                  index = 0;
                              }
                          } else {
                              if (additionalWebappConfigurationClass.getPosition() == Position.AFTER) {
                                  index++;
                              }
                          }
                      }
                      
                      newConfigurationClasses.addAll(index, additionalWebappConfigurationClass.getClasses());
                      
                      for (String className : additionalWebappConfigurationClass.getClasses()) {
                          LOG.debug("[{}] support added", className);
                      }
                  } else {
                      for (String className : additionalWebappConfigurationClass.getClasses()) {
                          LOG.debug("[{}] not available", className);
                      }
                  }
              }
          }
  
          // List configurations
          for (String configurationClasse : newConfigurationClasses) {
              LOG.trace("Jetty WebAppContext Configuration => " + configurationClasse);
          }
  
          return newConfigurationClasses.toArray(new String[newConfigurationClasses.size()]);
      }