private static Class<?> convertFieldType(String fieldType){
  if (fieldTypeMap.containsKey(fieldType)) {
    return fieldTypeMap.get(fieldType);
  }
  return null;
}

private static Class < ? > convertFieldType ( String fieldType ) { if ( fieldTypeMap . containsKey ( fieldType ) ) { return fieldTypeMap . get ( fieldType ) ; } return null ; }
convert field type from string to a class type .
