title: Spring, Jackson and Customization (e.g. CustomDeserializer)
body: <p>Being still a little unfamiliar with Spring, I have encountered a <a href="https://stackoverflow.com/questions/3535569/jackson-json-throws-jsonmappingexception-when-float-is-null">problem</a> that makes it necessary implementing my a custom deserialzer for Jackson. The procedure is described in a small <a href="http://wiki.fasterxml.com/JacksonHowToCustomDeserializers" rel="nofollow noreferrer">tutorial</a>, however, I am stuck with Spring. I do not understand, where </p>
  
  <pre><code> ObjectMapper mapper = new ObjectMapper();
  </code></pre>
  
  <p>in Spring MVC is carried out when json is deserializes by a method of a controller class. So I do not know, what to do in order to replace the default deserializer by a custom deserialiser.</p>
  
  <p>Any suggestions most welcome.</p>