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Reports objects which are a subtype of
<b>java.util.Set</b> or <b>java.util.Map</b>
and which may contain <b>java.net.URL</b> objects. Adding <b>java.net.URL</b>
objects to such collections can cause performance problems because of calls to the
<b>equals()</b> and <b>hashCode()</b>
methods of <b>java.net.URL</b>.
<b>java.net.URL</b>'s <b>equals()</b> and <b>hashCode()</b> method use a DNS
lookup, which depending on the availability of the network and the speed of the DNS server
can cause significant delays.
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