URIs should be used instead of URLs as Set or Map keys.
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                 Key: WICKET-3867
                 URL: https://issues.apache.org/jira/browse/WICKET-3867
             Project: Wicket
          Issue Type: Bug
          Components: wicket-core
    Affects Versions: 1.5-RC5.1
            Reporter: Bertrand Guay-Paquet


URLs are not suitable for use as Set or Map keys because their equals() and 
hashCode() methods are not well defined. URIs should be used to identify the 
location and URLs to access the actual resources.

See thread for 
http://mail-archives.apache.org/mod_mbox/wicket-users/201107.mbox/%3CCAPdiUN6CaH9rn4+tD9_hXP-dmBGn-SvFu=rvcmh8ayx5_1j...@mail.gmail.com%3E

Specifically:
[1] "More Joy of Sets" example with URL from Google Tech Talks:
http://www.youtube.com/watch?v=wDN_EYUvUq0#t=9m58s



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