title: YAML Jackson - NullPointerException when mapping an Integer property
body: <p>Jackson 2.6.5</p>
  
  <p>I try to map a YAML file to a POJO which contains Integer properties, when it reads the numeric properties, it throws:</p>
  
  <blockquote>
    <p>com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException)</p>
  </blockquote>
  
  <p>Funny thing is that if I single quote the numeric properties in the file, it parses them just fine (I guess it casts the String to Integers)</p>
  
  <p>Is there any flag I have to set for Jackson to not try to cast numeric values or something?</p>
  
  <p>Thank you</p>