Deserialize millisecond timestamp to java.time.Instant

Question

I'm attempting to read a JSON file using Jackson and store one of the fields that is stored as a epoch milliseconds as a Java Instant, however deserialization is not behaving as expected.

Here is what I am seeing when trying to read the timestamp:

1503115200000

Jackson is setting the Instant field as [phone]T16:00:00Z.

This appears to be occurring because Jackson's default is to read the timestamp with Instant.ofEpochSecond(Long l) instead of Instant.ofEpochMilli(Long l).

Is there a way to set the Jackson ObjectMapper to use the ofEpochMilli method instead? This is what I currently have for my ObjectMapper:

ObjectMapper om = new ObjectMapper()
            .registerModule(new JavaTimeModule())
            .configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, false)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
            .setSerializationInclusion(Include.NON_NULL);

Note

If I change the input JSON to ISO date such as 2017-08-19T04:00:00Z or to epoch seconds such as 1503115200 the Instant field is able to set properly.

Unfortunately the JSON input must be epoch milliseconds e.g. 1503115200000.

Answer 1

Solution was to add .configure(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS, false) to the ObjectMapper. Complete ObjectMapper looks like:

ObjectMapper om = new ObjectMapper()
            .registerModule(new JavaTimeModule())
            .configure(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS, false)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
            .configure(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS, false)
            .setSerializationInclusion(Include.NON_NULL);