serialize/deserialize java 8 java.time with Jackson JSON mapper

How do I use Jackson JSON mapper with Java 8 LocalDateTime?

org.codehaus.jackson.map.JsonMappingException: Can not instantiate value of type [simple type, class java.time.LocalDateTime] from JSON String; no single-String constructor/factory method (through reference chain: MyDTO["field1"]->SubDTO["date"])

There's no need to use custom serializers/deserializers here. Use jackson-modules-java8's datetime module:

Datatype module to make Jackson recognize Java 8 Date & Time API data types (JSR-310).

This module adds support for quite a few classes:

• Duration
• Instant
• LocalDateTime
• LocalDate
• LocalTime
• MonthDay
• OffsetDateTime
• OffsetTime
• Period
• Year
• YearMonth
• ZonedDateTime
• ZoneId
• ZoneOffset

Update: Leaving this answer for historical reasons, but I don't recommend it. Please see the accepted answer above.

Tell Jackson to map using your custom [de]serialization classes:

@JsonSerialize(using = LocalDateTimeSerializer.class)
@JsonDeserialize(using = LocalDateTimeDeserializer.class)
private LocalDateTime ignoreUntil;

provide custom classes:

public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
    @Override
    public void serialize(LocalDateTime arg0, JsonGenerator arg1, SerializerProvider arg2) throws IOException {
        arg1.writeString(arg0.toString());
    }
}

public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
    @Override
    public LocalDateTime deserialize(JsonParser arg0, DeserializationContext arg1) throws IOException {
        return LocalDateTime.parse(arg0.getText());
    }
}

random fact: if i nest above classes and don't make them static, the error message is weird: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported