title: Specify Concrete type of a specific Generic Collection Field in Jackson without Annotations
body: <p>I have a class which has a generic collection field</p>
  
  <pre><code>class Test {
    List&lt;E&gt; aList;
  }
  </code></pre>
  
  <p>I want to deserialize this using Jackson. How can i specify the type of collection to use for this specific field, not for all lists in the object, without using annotations (as I cannot change the existing class). </p>
  
  <p>I am a beginner in Jackson, so i don't know how to write a custom deserializer. </p>