The current (v2.12) code for getImageAsStream of PhotosInterface.class (com.Flickr4java.flickr.photos) uses the HTTP protocol when it should use the HTTPS protocol:

    HttpURLConnection conn = (HttpURLConnection) url.openConnection();

It should use

HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

And the associated include:

import java.net.HttpURLConnection;

should change to:

import java.net.HttpsURLConnection;