jetbrick-webmvc/src/main/java/jetbrick/web/mvc/multipart/MultipartRequest.java
@Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> map = new HashMap<String, String[]>(parameters);
        map.putAll(getRequest().getParameterMap());
        return map;
    }
@Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> map = new HashMap<String, String[]>(parameters);
        map.putAll(getRequest().getParameterMap());
        return map;
    }
<p> Combines the parameters stored here with those in the underlying
request. If paramater values in the underlying request take precedence
over those stored here. </p>