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Reports <code>Externalizable</code> classes that define <code>readObject()</code>
or <code>writeObject()</code> methods. These methods are not called for serialization of
<code>Externalizable</code> objects.
<p><b>Example:</b></p>
<pre><code>
  abstract class Crucial implements Externalizable {
    int value;
    private void readObject(ObjectInputStream in) {
      value = in.readInt();
    }
  }
</code></pre>
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