lmao.java

    /**
     * gets a record out of database by ID
     *
     * infers the type to use based on return
     *
     * RentalImpl r = Util.getById(10);
     *
     * @param c The implementation class name
     * @param id the id of the instance you want
     */
    public static <T> T getById(Long id) {
        return (T) DbConfig.withSession(
          s -> s.get(((Class) ((ParameterizedType) new Object() { }.getClass().getEnclosingClass().getGenericSuperclass()).getActualTypeArguments()[0]),
                     id)
                    );
    }