title: Getting "XmlRootElement cannot be resolved to a type" error after upgrading GWT from 2.8.1 to 2.8.2
body: <p>In order to fix the broken GWT drag and drop in Chrome 61, we decided to upgrade 
  GWT since the fix is in GWT 2.8.2.</p>
  
  <p>After upgrading, I got hundreds of following errors:</p>
  
  <pre><code>[ERROR] Line 7: XmlRootElement cannot be resolved to a type
  [ERROR] Line 3: The import javax.xml.bind cannot be resolved
  </code></pre>
  
  <p>I tried to upgraded other dependencies to the latest version and got no luck.
  Any solutions or suggestions are appreciated. Thanks.</p>