Umarshalling MonthDay spring jackson json

Question

Trying to make a restful service to save \" PeriodeEnseignement \" as below:

package DomainModel.Enseignement.Notations;

import java.time.MonthDay;

import java         


        

Answer 1

When you are working with Java 8 Time package and Jackson register JavaTimeModule in your ObjectMapper:

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

In Spring you can customise it as below:

@Bean
public Jackson2ObjectMapperBuilder objectMapperBuilder() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.modules(new JavaTimeModule());

    return builder;
}

EDIT
Update your method signature to:

public GenericResponse registerPeriodeEnseignement(@RequestBody PeriodeEnseignement periodeEnseignement)

Use @RequestBody annotation and make method public.

Answer 2

I finally solved the problem with several modifications.

1- Changing client-side call from jQuery.post to $.ajax call as shown here

var form = $('#myForm');
var jsonFormData = getFormData(form);

$.ajax({
            url : "/path/to/web/service/controller",
            type : "POST",
            dataType : "json",
            contentType : "application/json",
            data : JSON.stringify(jsonFormData),

            complete : function() {
            },

            success : function(data) {
                alert("success !");
            },

            error : function() {
                alert("failed !");
            },
        });
    });

function getFormData($form) {
    var unindexed_array = $form.serializeArray();
    var indexed_array = {};

    $.map(unindexed_array, function(n, i) {
        indexed_array[n['name']] = n['value'];
    });

    return indexed_array;
}

2- Added @RequestBody to my service-side routine:

@RequestMapping(value = "/periodeEnseignementService/registerPeriodeEnseignementService", method = RequestMethod.POST, produces = "application/json", consumes = "application/json")
public GenericResponse registerPeriodeEnseignement(@RequestBody PeriodeEnseignement periodeEnseignement) {
    return this.insertNewUniteeEnseignement(periodeEnseignement, this.periodeEnseignementRepository);
}

3- No need for @DateTimeFormatter neither @JsonFormat("dd/MMM") in the POJO class.

4- Had to configure a JsonSerializer and a JsonDeserializer for java.time.MonthDay, otherwise, the fields were left null.

@Bean
    public ObjectMapper objectMapperBuilder() {
        SimpleModule msJavaTimeModule = new SimpleModule();

        msJavaTimeModule.addSerializer(MonthDay.class, new JsonSerializer<MonthDay>() {
            @Override
            public void serialize(MonthDay value, JsonGenerator gen, SerializerProvider serializers)
                    throws IOException {
                gen.writeStartObject();
                gen.writeStringField("label", value.format(DateTimeFormatter.ofPattern("dd MMM", Locale.FRANCE)));
                gen.writeEndObject();
            }
        });

        msJavaTimeModule.addDeserializer(MonthDay.class, new JsonDeserializer<MonthDay>() {

            @Override
            public MonthDay deserialize(JsonParser p, DeserializationContext ctxt)
                    throws IOException, JsonProcessingException {
                JsonNode node = p.getCodec().readTree(p);

                String content = node.asText();

                int slashIndex = content.indexOf('/');

                String dayAsString = content.substring(0, slashIndex);
                String monthAsString = content.substring(slashIndex + 1);

                int day = Integer.parseInt(dayAsString);
                int month = Integer.parseInt(monthAsString);

                return MonthDay.of(month, day);
            }
        });

        ObjectMapper objectMapper = new Jackson2ObjectMapperBuilder().modules(msJavaTimeModule).build();

        return objectMapper;
    }

Thanks to Michał Ziober for the guidance !