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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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