fallbackResolver.addTagLibrary(uri, tagLibrary);
uriMap.put(uri, tagLibrary);
    public void addTagLibrary(String uri, TagLibrary tagLibrary) {        if (uri.length() == 0)            throw new IllegalArgumentException("uri is empty");        if (tagLibrary == null)            throw new NullPointerException("tag library is null");        fallbackResolver.addTagLibrary(uri, tagLibrary);    }