code: private void unregisterServletDescriptor(ServletDescriptor servletDescriptor) {
          try {
              servletDescriptor.unregister();
          } catch (RuntimeException e) {
              LOG.error(
                  "Unregistration of ServletDescriptor under mountpoint {} fails with unexpected RuntimeException!",
                  servletDescriptor.getAlias(), e);
          }
      }
docs: Unregister a servlet descriptor handling runtime exceptions