docs: protected Association getAssociation(final ServerManager serverManager, final ParameterList parameterList) {
          try {
              val authReq = AuthRequest.createAuthRequest(parameterList, serverManager.getRealmVerifier());
              val parameterMap = authReq.getParameterMap();
              if (parameterMap != null && !parameterMap.isEmpty()) {
                  val assocHandle = (String) parameterMap.get(OpenIdProtocolConstants.OPENID_ASSOCHANDLE);
                  if (assocHandle != null) {
                      return serverManager.getSharedAssociations().load(assocHandle);
                  }
              }
          } catch (final MessageException e) {
              LOGGER.error("Message exception : [{}]", e.getMessage(), e);
          }
          return null;
      }