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| Reports on subclasses of <b>java.lang.Comparator</b> which are not | |
| also <b>Serializable</b>. Objects of <b>java.util.TreeMap</b> | |
| or <b>java.util.TreeSet</b> will become non-<b>Serializable</b> | |
| if instantiated with such <b>Comparator</b>s. This can result in unexpected and difficult-to-diagnose | |
| bugs. Since subclasses of <b>java.lang.Comparator</b> are often stateless, simply marking | |
| them <b>Serializable</b> is a small cost to avoid such issues. | |
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