title: json4s error when using DefaultFormats
body: <p>I'm trying to use json4s to simply deserialize a list of object from json.</p>
  
  <p>However I'm always getting an error when setting the formats:</p>
  
  <blockquote>
    <p>java.lang.ClassNotFoundException </p>
  </blockquote>
  
  <p>In instance</p>
  
  <pre><code>import org.json4s.DefaultFormats
  import org.json4s.jackson.JsonMethods.parse
  
  class Deserializer {
    implicit val formats = DefaultFormats
  
    def desSubc(input : String) : List[String] = {
      val json = parse(input)
      json.extract[List[String]]
    }
  }
  </code></pre>
  
  <p>I'm getting this when object is created: </p>
  
  <blockquote>
    <p>java.lang.ClassNotFoundException</p>
  </blockquote>
  
  <p>I'm working with scala 2.12.3 and json4s-jackson_2.11 3.5.3</p>
  
  <p>Any ideas?</p>