return paramTypes;
    }

    private static String getSignature(final Object... methodArgs) {
        if (methodArgs == null || methodArgs.length == 0) {
            return "";
        }
        final StringBuilder buf = new StringBuilder(100);
        for (final Object arg : methodArgs) {
            if (arg != null) {
                buf.append(arg.getClass().getName());
            } else {

    }

    private static Class<?>[] toClassArray(final Object... methodArgs) {
        if (methodArgs == null) {
            return null;
        }
        final Class<?>[] result = new Class[methodArgs.length];
        for (int i = 0; i < methodArgs.length; ++i) {
            if (methodArgs[i] != null) {
                result[i] = methodArgs[i].getClass();
            }
        }
        return result;
    }

    private static boolean isApplicable(Method method, Class<?>... classes) {
        Class<?>[] methodArgs = method.getParameterTypes();

        if (methodArgs.length != classes.length) {
            return false;
        }

        for (int i = 0; i < classes.length; ++i) {
            if (!isMethodInvocationConvertible(methodArgs[i], classes[i])) {
                return false;
            }
        }

     * @param methodArgs
     *            引数の並び
     * @return シグニチャの文字列表現
     */
    public static String getSignature(final String methodName, final Object... methodArgs) {
        assertArgumentNotEmpty("methodName", methodName);

        final StringBuilder buf = new StringBuilder(100);
        buf.append(methodName).append("(");
        if (methodArgs != null && methodArgs.length > 0) {