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Reports fields in subclasses of <code>java.lang.Exception</code> that are not declared <code>final</code>.
<p>Data on exception objects should not be modified
  because this may result in losing the error context for later debugging and logging.</p>
<p><b>Example:</b></p>
<pre><code>
  public class EditorException extends Exception {
    private String message; // warning: Non-final field 'message' of exception class
  }
</code></pre>
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