Cannot deserialize value of type LocalDateTime from String

I have the following DTO and Entity:

public class PaymentDto {

    private String provider;

    private Duration timeDifferenceDate;

    public PaymentDto() {
        // Empty for framework
    }

    public PaymentDto(Payment payment) {
        this.provider = payment.getProvider();
        this.setRegistrationDate(payment.getRegistrationDate());
    }

    public Duration getRegistrationDate() {
        return timeDifferenceDate;
    }

    public void setRegistrationDate(LocalDateTime registrationDate) {
        LocalDateTime now = LocalDateTime.now();
        Duration duration = Duration.between(now, registrationDate);
        this.timeDifferenceDate = duration;
    }

}

public class Payment {

    private LocalDateTime registrationDate;

    public Payment() {
        // Empty for framework
    }

But when it converts from Payment to PaymentDto I have problems with JSON decoding, specifically with the conversion from LocalDateTime to Duration. Some idea?

    @Override
    public List<PaymentDto> readAll() {
        return this.paymentPersistence.readAll().stream()
                .map(PaymentDto::new).collect(Collectors.toList());
    }

org.springframework.core.codec.DecodingException: JSON decoding error: Cannot deserialize value of type `java.time.LocalDateTime` from String "PT-1.015005S": Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text 'PT-1.015005S' could not be parsed at index 0; nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `java.time.LocalDateTime` from String "PT-1.015005S": Failed to deserialize java.time.LocalDateTime: (java.time.format.DateTimeParseException) Text 'PT-1.015005S' could not be parsed at index 0
 at [Source: UNKNOWN; line: -1, column: -1] (through reference chain: com.user.rest.dtos.PaymentDto["registrationDate"])

	at org.springframework.http.codec.json.AbstractJackson2Decoder.processException(AbstractJackson2Decoder.java:215)
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
	|_ checkpoint ⇢ Body from GET http://localhost:61072/payments [DefaultClientResponse]
Stack trace:
		at org.springframework.http.codec.json.AbstractJackson2Decoder.processException(AbstractJackson2Decoder.java:215)

Thanks by the way.

LocalDateTime can not be converted to Duration and vice versa. There is nothing common, except Serializable (and of course Object), in their hierarchies.

Replace

private LocalDateTime registrationDate;

with

private Duration registrationDate;

or create a new instance variable of type, Duration.

As @Arvind Kumar Avinash mentioned above, you need to provide appropriate type Duration in the setter PaymentDto::setRegistrationDate.

Also you should modify the "conversion" constructor if you populate a DTO from an entity which returns a LocalDateTime field. Also, when calculating the duration, you should place registrationDate first to avoid "negative" duration (earlier instant in time comes first).

public PaymentDto(Payment payment) {
    this.provider = payment.getProvider();
    this.setRegistrationDate(Duration.between(
        payment.getRegistrationDate(),  // older "start" date should go first
        LocalDateTime.now()
    ));
}

public void setRegistrationDate(Duration timeDifference) 
    this.timeDifferenceDate = timeDifference;
}