title: ClassNotFoundException: org.slf4j.LoggerFactory
body: <p>I am trying to run GWT RequestFactory and facing this error:</p>
  
  <pre><code>ClassNotFoundException: org.slf4j.LoggerFactory
  </code></pre>
  
  <p>I have tried to download <em>slf4j-api-1.3.1.jar</em> but it didnt resolve the issue </p>
  
  <p>Any idea exactly which jar I need to download ?</p>