public void init(final FilterConfig config) throws ServletException {
        servletContext = config.getServletContext();

        encoding = config.getInitParameter(LastaPrepareFilter.ENCODING_KEY);
        if (encoding == null) {
            encoding = LastaPrepareFilter.DEFAULT_ENCODING;
        }

        // ex. sjis:Shift_JIS,eucjp:EUC-JP
        final String value = config.getInitParameter(ENCODING_MAP);

  <filter>
    <filter-name>webApiFilter</filter-name>
    <filter-class>org.codelibs.fess.filter.WebApiFilter</filter-class>
  </filter>

  <filter>
    <filter-name>lastaPrepareFilter</filter-name>
    <filter-class>org.lastaflute.web.servlet.filter.LastaPrepareFilter</filter-class>
  </filter>

  <filter>
    <filter-name>lastaShowbaseFilter</filter-name>