Spring Boot Bean Validation for LocatDateTime

Question

I have Person POJO where in private LocalDateTime startTime; attribute as below,

    @NotNull
    @JsonProperty("startTime")
    @DateTimeFormat(pattern = "yyyy-MM-dd'T'hh:mm:ssZ", iso = DateTimeFormat.ISO.DATE_TIME)
    private LocalDateTime startTime;

I need to send "startTime": "2020-08-20T12:30:18+0000", from my JSON input to a rest end point.

I get bad request, is there anything missing in my validation? I tried with removing Z and adding @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd@HH:mm:ssZ") also but not working.

Answer 1

You can write a Deserializer for LocalDateTime for your desired format and use on field.

@NotNull
@JsonDeserialize(using = JacksonLocalDateTimeDeserializer.class)
private LocalDateTime startTime;

Custom Deserializer implementations

import java.time.format.DateTimeFormatter;

public class JacksonLocalDateTimeDeserializer extends StdDeserializer<LocalDateTime> {
  private static final long serialVersionUID = 9152770723354619045L;
  public JacksonLocalDateTimeDeserializer() { this(null);}
  protected JacksonLocalDateTimeDeserializer(Class<LocalDateTime> type) { super(type);}

  @Override
  public LocalDateTime deserialize(JsonParser parser, DeserializationContext context)
      throws IOException, JsonProcessingException {
    if (parser.getValueAsString().isEmpty()) {
       return null;
    }
    return LocalDateTime.parse(parser.getValueAsString(),
                                    DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssZ"));
  }
}