Cached Optional serializer does not apply annotations for POJO properties #17
Description
Simple test case:
public class JsonObjectTest {
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd")
private Optional<Date> date1;
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM")
private Optional<Date> date2;
public JsonObjectTest () {}
public Optional<Date> getDate1() {
return date1;
}
public void setDate1(Optional<Date> date1) {
this.date1 = date1;
}
public Optional<Date> getDate2() {
return date2;
}
public void setDate2(Optional<Date> date2) {
this.date2 = date2;
}
}public class Main {
public static void main(String[] args) throws JsonProcessingException {
JsonObjectTest t = new JsonObjectTest();
t.setDate1(Optional.ofNullable(new Date()));
t.setDate2(Optional.ofNullable(new Date()));
ObjectMapper mapper = new ObjectMapper().registerModule(new Jdk8Module());
System.out.println(mapper.writeValueAsString(t));
}
}produces the output:
{"date1":"2017-03-10","date2":"2017-03-10"}
changing the order of the members to:
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM")
private Optional<Date> date2;
@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd")
private Optional<Date> date1;produces the output:
{"date2":"2017-03","date1":"2017-03"}
I have found that the issue lies in OptionalSerializer.java on the ser = _findCachedSerializer(provider, value.getClass()); line. The first time a Date is encountered, a new serializer is constructed which observes the relevant annotation; however, every time a Date is encountered afterwards the cached serializer is used without any consideration regarding annotation differences.