code: @Override
      public int doStartTag() throws PageException {
  	try {
  	    _doStartTag();
  	}
  	catch (IOException e) {
  	    throw Caster.toPageException(e);
  	}
  	return SKIP_BODY;
      }
docs: /*
  public static CacheHandlerFilter createFilterx(String sql) { if(!StringUtil.isEmpty(sql,true)) {
  return new QueryCacheHandlerFilter(sql); } return null; }