Using DateTimeFormatter with ObjectMapper

Question

Prior to Java8, we used to set DateFormat with ObjectMapper as follows

DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
ObjectMapper mapper = <SomeInstantiation>
mapper.setDateFormat(df);
mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);

Now that we have java.time.format.DateTimeFormatter which is threadsafe and more robust unlike SimpleDateFormat. I want to replace above settings on ObjectMapper.

How do I set DateTimeFormatter with ObjectMapper

Answer 1

You can try the following:

DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;

LocalDateTimeDeserializer dateTimeDeserializer = new LocalDateTimeDeserializer(formatter);
LocalDateTimeSerializer dateTimeSerializer = new LocalDateTimeSerializer(formatter);

JavaTimeModule javaTimeModule = new JavaTimeModule(); 
javaTimeModule.addDeserializer(LocalDateTime.class, dateTimeDeserializer);
javaTimeModule.addSerializer(LocalDateTime.class, dateTimeSerializer);

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(javaTimeModule);

The jackson-datatype-jsr310 dependency is required:

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.8.2</version>
</dependency>