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Reports <code>@GuardedBy</code> annotations in which the specified guarding field is unknown.
<p>Example:</p>
<pre><code>
    private Object state;

    @GuardedBy("lock") //unknown guard reference
    public void bar() {
        state = new Object();
    }
</code></pre>
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<p>Supported <code>@GuardedBy</code> annotations are:</p>
<ul>
  <li><code>net.jcip.annotations.GuardedBy</code></li>
  <li><code>javax.annotation.concurrent.GuardedBy</code></li>
  <li><code>org.apache.ht