Java – Spring boot + Jackson + LocalDateTime: Date not parsed correctly
jackson
java
java-8
spring-boot
I have a LocalDateTime property in my entity class, but when it's serialized, I don't see the expected format.
This is the class:
public class MyEntity {
private Integer id;
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'")
private LocalDateTime changeDate;
// getters and setters
This is how jackson is formatting it:
"id": 56,
"changeDate": {
"hour":14, "minute":19,
"nano":797000000,
"second":7,
"dayOfMonth":24,
"dayOfWeek":"TUESDAY",
"dayOfYear":297, "month":"OCTOBER",
"monthValue":10,
"year":2017,
"chronology": {
"id":"ISO",
"calendarType":"iso8601"
Note that I added the following dependency to my pom:
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
</dependency>
I don't include the version because spring boot takes care of that.
By the way I'm using spring boot 1.5.2.RELEASE.
I also included the following property in application.properties:
spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false
Any idea why the date is not formatted with like that instead of using the pattern I provided?
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import java.io.IOException;
import java.time.LocalDateTime;
import static java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME;
public class JsonDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
private static final String NULL_VALUE = "null";
@Override
public LocalDateTime deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException {
ObjectCodec oc = jp.getCodec();
JsonNode node = oc.readTree(jp);
String dateString = node.textValue();
LocalDateTime dateTime = null;
if (!NULL_VALUE.equals(dateString)) {
dateTime = LocalDateTime.parse(dateString, ISO_LOCAL_DATE_TIME);
return dateTime;
My serializer:
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import java.io.IOException;
import java.time.LocalDateTime;
import static java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME;
public class JsonLocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime dateTime, JsonGenerator generator, SerializerProvider provider)
throws IOException {
String dateTimeString = dateTime.format(ISO_LOCAL_DATE_TIME);
generator.writeString(dateTimeString);
You need to set your own formatter.
In my RestConfig I have:
@Configuration
@ComponentScan(value = {"ru.outofrange.controller"})
public class RestConfig extends RepositoryRestConfigurerAdapter {
@Override
public void configureJacksonObjectMapper(ObjectMapper objectMapper) {
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
registerSerializerDeserializer(objectMapper);
private void registerSerializerDeserializer(ObjectMapper objectMapper) {
SimpleModule module = new SimpleModule();
module.addSerializer(LocalDateTime.class, new JsonLocalDateTimeSerializer());
module.addDeserializer(LocalDateTime.class, new JsonDateTimeDeserializer());
objectMapper.registerModule(module);
