title: Collections.synchronizedMap(new LinkedHashMap()); is not making Map threadsafe
body: <p>I'm using following construct for creating a threadsafe <code>Map</code>.</p>
  
  <pre><code>Collections.synchronizedMap(new LinkedHashMap());
  </code></pre>
  
  <p>Though I'm getting <code>ConcurrentModificationException</code> error.</p>