ImageIO.read() has a variant taking a java.io.URL instance. This should, by default, use caching (possibly in-memory per-session, but we would download the tiles anyway, so maybe that is acceptable) automatically. I was about to try to cook up a patch falling back to using this method if the getResourceAsStream() call returns null, but I couldn't find a URL to the Bing logo. The logo embedded in the upstream source seems to be an older version, and looking at the bing.com website I could only see sheet images (indexed by CSS classes).
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