ZonedDateTime cannot be parsed from JSON, but parses fine with the formatter

Question

I have this date string coming in through JSON: "29-OCT-21 12.00.00.000000000 AM UTC". I want to save it as a ZonedDateTime data type.

I have the property set in the model as such:

  @JsonProperty("createdTs")
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MMM-yy hh.mm.ss.SSSSSSSSS a z", with = JsonFormat.Feature.ACCEPT_CASE_INSENSITIVE_PROPERTIES)
    private ZonedDateTime createdTs;

I am getting an error:

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize value of type `java.time.ZonedDateTime` from String "29-OCT-21 12.00.00.000000000 AM UTC": Failed to deserialize java.time.ZonedDateTime: (java.time.format.DateTimeParseException) Text '29-OCT-21 12.00.00.000000000 AM UTC' could not be parsed 

I can't figure out what is wrong. The pattern works just fine in the formatter in test cases, like this:

DateTimeFormatter formatter = new DateTimeFormatterBuilder().parseCaseInsensitive().appendPattern("dd-MMM-yy hh.mm.ss.SSSSSSSSS a z").toFormatter(
        Locale.getDefault());
    locationPayload.setcreatedTs(ZonedDateTime.parse("29-OCT-21 12.00.00.000000000 AM UTC", formatter));

Answer 1

This issue is related to the inability of the JsonFormat to handle the complex date-time format you have in the JSON string. To resolve this, you can create a custom deserializer for the ZonedDateTime type.

Here's an example:

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import java.io.IOException;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;

public class ZonedDateTimeDeserializer extends JsonDeserializer<ZonedDateTime> {

    private static final DateTimeFormatter FORMATTER = new DateTimeFormatterBuilder()
            .parseCaseInsensitive()
            .appendPattern("dd-MMM-yy hh.mm.ss.SSSSSSSSS a z")
            .toFormatter();

    @Override
    public ZonedDateTime deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        String dateString = jsonParser.getText();
        return ZonedDateTime.parse(dateString, FORMATTER);
    }
}

Your property

public class Test {

    @JsonProperty("createdTs")
    @JsonDeserialize(using = ZonedDateTimeDeserializer.class)
    private ZonedDateTime createdTs;
//Getter & Settere
}

Test

    public static void main(String[] args) throws JsonProcessingException {
        String s = """
                {
                "createdTs": "29-OCT-21 12.00.00.000000000 AM UTC"
                }
                """;

        Test t = JsonMapper.builder().findAndAddModules().build().readValue(s, Test.class);

        System.out.println(t);
    }

Output Test(createdTs=2021-10-29T00:00Z[UTC])

Try it and let me know