code: private static String getMessage(Collection<Object> brokenReferences) {
          StringBuilder sb = new StringBuilder();
          for (Object o : brokenReferences) {
              if (sb.length() > 0) {
                  sb.append(", ");
              }
              sb.append(o);
          }
          return "Unable to resolve reference to bean [" + sb.toString() + "]";
      }
docs: Gets the detail message.
  
  @param brokenReferences the list of beans that can not find
  @return the message