*/
    public static <T1, T2> Pair<T1, T2> pair(final T1 first, final T2 second) {
        return new Pair<>(first, second);
    }

    /**
     * インスタンスを構築します。
     */
    public Pair() {
    }

    /**
     * インスタンスを構築します。
     *
     * @param first
     *            1番目の値
     * @param second
     *            2番目の値
     */
    public Pair(final T1 first, final T2 second) {

                        .collect(Collectors.groupingBy(Pair::getFirst, Collectors.mapping(Pair::getSecond, Collectors.toList())));
                appendJson("search-field", searchFieldMap, buf).append(',');
                final Map<String, List<String>> requestHeaderMap = entity.getRequestHeaderList().stream()
                        .collect(Collectors.groupingBy(Pair::getFirst, Collectors.mapping(Pair::getSecond, Collectors.toList())));

        return designJspFileNameMap.get(fileName);
    }

    @SuppressWarnings("unchecked")
    public Pair<String, String>[] getDesignJspFileNames() {
        return designJspFileNameMap.entrySet().stream().map(e -> new Pair<>(e.getKey(), e.getValue())).toArray(n -> new Pair[n]);
    }

    public List<Path> refreshDesignJspFiles() {
        final List<Path> fileList = new ArrayList<>();