Deserialize Java 8 LocalDateTime with JacksonMapper

Question

I have read several questions with answers here in SO concerning serialization and deserialization between java time LocalDateTime and JSON property but I can t seem to get it working   I have managed to configure my Spring Boot Application to return the dates in the format I desire  YYY-MM-dd HH mm  but I have problems accepting values in this format in JSON   These are all the things I have done so far   Added maven dependency for jsr310    lt dependency gt       lt groupId gt com fasterxml jackson datatype lt  groupId gt       lt artifactId gt jackson-datatype-jsr310 lt  artifactId gt   lt  dependency gt    Specified jsr310 in my main class    EntityScan basePackageClasses     App class  Jsr310JpaConverters class      Disabled serialization as timestamps in application properties   spring jackson serialization write dates as timestamps false   And this is my entity mapping for datetime    Column name    start date    DateTimeFormat iso   DateTimeFormat ISO TIME   JsonFormat pattern    YYYY-MM-dd HH mm   private LocalDateTime startDate    In my database  I store this date as TIMESTAMP in the following format  2016-12-01T23 00 00 00 00   If I access this entity via my controller  it returns the JSON with correct startDate format  When I try to post it and deserialize it though  using YYYY-MM-dd HH mm format  I get the following exception        timestamp    2016-10-30T14 22 25 285 0000      status   400     error    Bad Request      exception    org springframework http converter HttpMessageNotReadableException      message    Could not read document  Can not deserialize value of type java time LocalDateTime from String   2017-01-01 20 00    Text  2017-01-01 20 00  could not be parsed  Unable to obtain LocalDateTime from TemporalAccessor   MonthOfYear 1  WeekBasedYear WeekFields SUNDAY 1   2017  DayOfMonth 1  ISO resolved to 20 00 of type java time format Parsed n at  Source  java io PushbackInputStream 679a734d  line  6  column  16   through reference chain  com gigsterous api model Event   startDate      nested exception is com fasterxml jackson databind exc InvalidFormatException  Can not deserialize value of type java time LocalDateTime from String   2017-01-01 20 00    Text  2017-01-01 20 00  could not be parsed  Unable to obtain LocalDateTime from TemporalAccessor   MonthOfYear 1  WeekBasedYear WeekFields SUNDAY 1   2017  DayOfMonth 1  ISO resolved to 20 00 of type java time format Parsed n at  Source  java io PushbackInputStream 679a734d  line  6  column  16   through reference chain  com gigsterous api model Event   startDate          path     api events      I know that there are many answers concerning this topic but following them and trying for couple of hours did not help me to figure out what am I doing wrong so I would be glad if someone could point out to me what am I missing  Thanks for any input on this   EDIT  These are all the classes involved in the process   Repository    Repository public interface EventRepository extends PagingAndSortingRepository lt Event  Long gt        Controller    RequestMapping method   RequestMethod POST  consumes   MediaType APPLICATION JSON VALUE  public ResponseEntity lt Event gt  createEvent  RequestBody Event event            return new ResponseEntity lt  gt  eventRepo save event   HttpStatus CREATED       My JSON request payalod        name    Test      startDate    2017-01-01 20 00      Event    Entity  Table name    events    Getter  Setter public class Event         Id      GeneratedValue strategy   GenerationType AUTO       Column name    event id       private long id        Column name    name       private String name        Column name    start date        DateTimeFormat iso   DateTimeFormat ISO TIME       JsonFormat pattern    YYYY-MM-dd HH mm       private LocalDateTime startDate

User · Answer

UPDATE   Change to    Column name    start date    DateTimeFormat pattern    yyyy-MM-dd HH mm   iso   ISO DATE TIME   JsonFormat shape   JsonFormat Shape STRING  pattern    yyyy-MM-dd HH mm   private LocalDateTime startDate    JSON request       startDate   2019-04-02 11 45

User · Answer

There are two problems with your code  1  Use of wrong type LocalDateTime does not support timezone  Given below is an overview of java time types and you can see that the type which matches with your date-time string  2016-12-01T23 00 00 00 00 is OffsetDateTime because it has a zone offset of  00 00   Change your declaration as follows  private OffsetDateTime startDate   2  Use of wrong format There are two problems with the format   You need to use y  year-of-era   instead of Y  week-based-year    Check this discussion to learn more about it  In fact  I recommend you use u  year  instead of y  year-of-era    Check this answer for more details on it  You need to use XXX or ZZZZZ for the offset part i e  your format should be uuuu-MM-dd T HH m ssXXX   Check the documentation page of DateTimeFormatter for more details about these symbols formats  Demo  import java time OffsetDateTime  import java time format DateTimeFormatter   public class Main       public static void main String   args            String strDateTime    quot 2019-10-21T13 00 00 02 00 quot           DateTimeFormatter dtf   DateTimeFormatter ofPattern  quot uuuu-MM-dd T HH m ssXXX quot            OffsetDateTime odt   OffsetDateTime parse strDateTime  dtf           System out println odt            Output  2019-10-21T13 00 02 00  Learn more about the modern date-time API from Trail  Date Time

User · Answer

You can implement your JsonSerializer  See   That your propertie in bean   JsonProperty  start date    JsonFormat  YYYY-MM-dd HH mm    JsonSerialize using   DateSerializer class  private Date startDate    That way implement your custom class  public class DateSerializer extends JsonSerializer lt Date gt  implements ContextualSerializer lt Date gt         private final String format       private DateSerializer final String format            this format   format             public DateSerializer             this format   null              Override     public void serialize final Date value  final JsonGenerator jgen  final SerializerProvider provider  throws IOException           jgen writeString new SimpleDateFormat format  format value                Override     public JsonSerializer lt Date gt  createContextual final SerializationConfig serializationConfig  final BeanProperty beanProperty  throws JsonMappingException           final AnnotatedElement annotated   beanProperty getMember   getAnnotated            return new DateSerializer annotated getAnnotation JsonFormat class  value                Try this after post result for us

User · Answer

This worked for me    import org springframework format annotation DateTimeFormat  import org springframework format annotation DateTimeFormat ISO    Column name  end date   nullable   false   DateTimeFormat iso   ISO DATE TIME   JsonFormat pattern    yyyy-MM-dd HH mm   private LocalDateTime endDate

User · Answer

You used wrong letter case for year in line      JsonFormat pattern    YYYY-MM-dd HH mm     Should be      JsonFormat pattern    yyyy-MM-dd HH mm     With this change everything is working as expected

User · Answer

The date time you re passing is not a iso local date time format   Change to    Column name    start date    DateTimeFormat iso   DateTimeFormatter ISO LOCAL DATE TIME   JsonFormat pattern    YYYY-MM-dd HH mm   private LocalDateTime startDate    and pass date string in the format  2011-12-03T10 15 30    But if you still want to pass your custom format  use just have to specify the  right formatter   Change to   Column name    start date    DateTimeFormat iso   DateTimeFormatter ofPattern  yyyy-MM-dd HH mm     JsonFormat pattern    YYYY-MM-dd HH mm   private LocalDateTime startDate    I think your problem is the  DateTimeFormat has no effect at all  As the  jackson is doing the deseralization and it doesnt know anything about spring annotation and I dont see spring scanning this annotation in the deserialization context   Alternatively  you can try setting the formatter while registering the java time module   LocalDateTimeDeserializer localDateTimeDeserializer   new LocalDateTimeDeserializer DateTimeFormatter ofPattern  yyyy-MM-dd HH mm     module addDeserializer LocalDateTime class  localDateTimeDeserializer     Here is the test case with the deseralizer which works fine  May be try to get rid of that DateTimeFormat annotation altogether    RunWith JUnit4 class  public class JacksonLocalDateTimeTest        private ObjectMapper objectMapper        Before     public void init             JavaTimeModule module   new JavaTimeModule            LocalDateTimeDeserializer localDateTimeDeserializer    new LocalDateTimeDeserializer DateTimeFormatter ofPattern  yyyy-MM-dd HH mm             module addDeserializer LocalDateTime class  localDateTimeDeserializer           objectMapper   Jackson2ObjectMapperBuilder json                    modules module                   featuresToDisable SerializationFeature WRITE DATES AS TIMESTAMPS                   build                Test     public void test   throws IOException           final String json        date      2016-11-08 12 00               final JsonType instance   objectMapper readValue json  JsonType class            assertEquals LocalDateTime parse  2016-11-08 12 00  DateTimeFormatter ofPattern  yyyy-MM-dd HH mm      instance getDate               class JsonType       private LocalDateTime date       public LocalDateTime getDate             return date             public void setDate LocalDateTime date            this date   date

User · Answer

This worked for me     JsonFormat pattern    yyyy-MM-dd T HH mm ss SSSZ   shape   JsonFormat Shape STRING   private LocalDateTime startDate

[java] Deserialize Java 8 LocalDateTime with JacksonMapper

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