}

    /**
     * リソースバンドルを返します。
     *
     * @param systemName
     *            システム名
     * @return リソースバンドル
     */
    protected static ResourceBundle getResourceBundle(final String systemName) {
        if (!initialized) {
            initialize();
        }
        return ResourceBundleUtil.getBundle(systemName + MESSAGES, LocaleUtil.getDefault());
    }

    /**

        }

        if (Artifact.SCOPE_SYSTEM.equals(artifact.getScope())) {
            File systemFile = artifact.getFile();

            if (systemFile == null) {
                throw new ArtifactNotFoundException("System artifact: " + artifact + " has no file attached", artifact);
            }

            if (!systemFile.exists()) {
                throw new ArtifactNotFoundException(