ZonedDateTime serialize epoch milliseconds with FasterXML Jackson

Question

I'm intended to use epoch millisecond for the deserialization and serialization. However only the deserialzation works but failed to serialize back to the correct ZonedDateTime.

ObjectMapper mapper = new ObjectMapper();
mapper.setTimeZone(TimeZone.getDefault());
mapper.registerModule(new JavaTimeModule());
mapper.configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, false);

System.out.println(mapper.writeValueAsString(ZonedDateTime.now()));  // print 1493703996728 [Expected]
System.out.println(mapper.readValue("1493703996728", ZonedDateTime.class)); // print +49303-08-07T00:52:08+08:00[Asia/Singapore] [Unexpected]

how to make the serialize to get the date of 2017-05-02T13:46:36.728+08:00[Asia/Singapore]?

version of com.fasterxml.jackson.* are all 2.8.8

Answer 1

You also need to disable nanoseconds for deserialization to make Jackson parse milliseconds:

mapper.configure(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS, false);