Graceful way to get a List<LocalDate>

[A. Rick Anderson]

Using custom serializer/deserializer classes, I've figured out how to work with LocalDate, with different formats, and in such a way that none of the client classes have to worry about the specific structure of my JSON DAO's. 

But, I haven't been able to figure out how to get from an JSON array of LocalDate to a Java List.  A List<String> works great.  Not so lucky with List<LocalDate>.  Any suggestions?

   static public final DateTimeFormatter meetingTitleFormatter     = DateTimeFormatter.ofPattern("dd MMMM yyyy");
   static public final DateTimeFormatter meetingIDFormatter        = DateTimeFormatter.ofPattern("yyyyMMdd");
   static public final DateTimeFormatter meetingDateFormatter      = DateTimeFormatter.ofPattern("yyyy-MM-dd");
   static public final DateTimeFormatter meetingShortDateFormatter = DateTimeFormatter.ofPattern("yyyy MMM dd");
   static public final DateTimeFormatter meetingLongDateFormatter  = DateTimeFormatter.ofPattern("yyyy MMMM dd");


   @JsonProperty("StringDates")
   private List<LocalDate> PossibleMeetingDates = new ArrayList<>();
   @JsonDeserialize(using = MeetingShortDateDeserializer.class)
   @JsonSerialize(using = MeetingShortDateSerializer.class)
   @JsonProperty("MeetingShortDate")
   private LocalDate    meetingShortDate;
   @JsonDeserialize(using = MeetingIDDeserializer.class)
   @JsonSerialize(using = MeetingIDSerializer.class)
   @JsonProperty("MeetingID")
   private LocalDate    meetingID;
   @JsonDeserialize(using = MeetingDateDeserializer.class)
   @JsonSerialize(using = MeetingDateSerializer.class)
   @JsonProperty("MeetingDate")
   private LocalDate    meetingDate;
   @JsonDeserialize(using = MeetingTitleDeserializer.class)
   @JsonSerialize(using = MeetingTitleSerializer.class)
   @JsonProperty("MeetingTitle")
   private LocalDate    meetingTitle;

[Tatu Saloranta]

I think what you are looking for is

@JsonDeserialize(contentUsing = MeetingShortDateSerializer.class)
List<LocalDate> meetingShortDate;

since `using` refers to value itself, and to specify deserializer for
elements of a container you need to use `contentUsing` instead.

-+ Tatu +-

[A. Rick Anderson]

Thank-you! 

You are a saint!  Such an elegant answer.  and now I know the 'secret' !

[Tatu Saloranta]

Glad I was able to help here, share some knowledge :)

-+ Tatu +-

On Fri, Sep 25, 2020 at 2:25 PM A. Rick Anderson

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