code: private static ClassAndMethod getClassForFieldName(String fieldName, Class<?> classToLookForFieldIn) {
          return internalGetClassForFieldName(fieldName, classToLookForFieldIn, false);
      }
docs: Gets a class for a JSON field name, by looking in a given Class for an appropriate setter.
  The setter is assumed not to be a Collection.
  
  @param fieldName the name to use to search for the getter.
  @param classToLookForFieldIn the Class to search for the getter within.
  @return instance of ClassAndMethod if one is found, null otherwise