return OptionalThing.of(asJson(createFailureBean(Status.BAD_REQUEST, createMessage(resource, cause))));
    }

    @Override
    public OptionalThing<ApiResponse> handleServerException(final ApiFailureResource resource, final Throwable cause) {
        return OptionalThing.of(asJson(createFailureBean(Status.SYSTEM_ERROR, createMessage(resource, cause))));
    }

     */
    public SAXRuntimeException(final SAXException cause) {
        super("ECL0054", asArray(createMessage(cause)), cause);
    }

    /**
     * メッセージを作成します。
     *
     * @param cause
     *            原因
     * @return メッセージ
     */
    protected static String createMessage(final SAXException cause) {
        final StringBuilder buf = new StringBuilder(100);
        buf.append(cause);

            MojoExecution execution,
            MavenProject project,
            Throwable cause) {
        this(createMessage(messageBuilderFactory, execution, project, cause), execution, project, cause);
    }

    public MavenProject getProject() {
        return project;
    }

    private static String createMessage(
            MessageBuilderFactory messageBuilderFactory,
            MojoExecution execution,

    @SuppressWarnings("unchecked")
    @Override
    public ActionValidator<FessMessages> createValidator() {
        return systemHelper.createValidator(requestManager, this::createMessages, myValidationGroups());
    }

    @Override
    public FessMessages createMessages() { // application may call
        return new FessMessages(); // overriding to change return type to concrete-class
    }