docs: public static void closeSession(String wrapper) {
  		Session session = map.get(wrapper);
  		if (session != null) {
  			Method method;
  			try {
  				method = session.getClass().getDeclaredMethod("protectedClose");
  				method.setAccessible(true);
  				method.invoke(session);
  			} catch (InvocationTargetException e) {
  				throw new RiverException(e.getCause().getMessage(), e);
  			} catch (Exception e) {
  				throw new RiverException(e);
  			}
  			map.remove(wrapper);
  		}
  	}