CODEWITHSUNDEEP
javaspringspring-mvc
Lawrence Beutlich
Lawrence Beutlich

Reputation: 61

Spring Post Controller not Serializing JSON Request to Java Object

So I have this controller: 

@RequestMapping(value = "/zone/settings/ranged/update", method = RequestMethod.POST, produces="application/json", consumes="application/json")
public @ResponseBody ResponseEntity<Map<String, Object>> zoneSettingsRangedUpdate(
        WebRequest request,
        @RequestBody RoundRangeData data,
        Map<String, Object> model
) throws IOException {
    model.put("request", data);
    model.put("success",true);

    return new ResponseEntity<>(model, HttpStatus.OK);
}


With this as the POJO: 

public class RoundRangeData {
    private BigInteger pricingDate;
    private Long zoneid;
    private Long psid;
    private Float roundTo;
    private Float lowerLimit;
    private Float upperLimit;

public RoundRangeData() {

}

public RoundRangeData(BigInteger pricingDate, Long zoneid, Long psid, Float roundTo, Float lowerLimit, Float upperLimit) {
    this.pricingDate = pricingDate;
    this.zoneid = zoneid;
    this.psid = psid;
    this.roundTo = roundTo;
    this.lowerLimit = lowerLimit;
    this.upperLimit = upperLimit;
}

public BigInteger getPricingDate() {
    return pricingDate;
}

public void setPricingDate(BigInteger pricingDate) {
    this.pricingDate = pricingDate;
}

public Long getZoneid() {
    return zoneid;
}

public void setZoneid(Long zoneId) {
    this.zoneid = zoneId;
}

public Long getPsid() {
    return psid;
}

public void setPsid(Long psid) {
    this.psid = psid;
}

public Float getRoundTo() {
    return roundTo;
}

public void setRoundTo(Float roundTo) {
    this.roundTo = roundTo;
}

public Float getLowerLimit() {
    return lowerLimit;
}

public void setLowerLimit(Float lowerLimit) {
    this.lowerLimit = lowerLimit;
}

public Float getUpperLimit() {
    return upperLimit;
}

public void setUpperLimit(Float upperLimit) {
    this.upperLimit = upperLimit;
}
}

Using this request (Chrome devtools screenshot, actual request has quotes around properties):

enter image description here

And I keep getting this error:

WARNING: Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: No serializer found for class org.springframework.validation.DefaultMessageCodesResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.validation.support.BindingAwareModelMap["org.springframework.validation.BindingResult.roundRangeData"]->org.springframework.validation.BeanPropertyBindingResult["messageCodesResolver"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.springframework.validation.DefaultMessageCodesResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.validation.support.BindingAwareModelMap["org.springframework.validation.BindingResult.roundRangeData"]->org.springframework.validation.BeanPropertyBindingResult["messageCodesResolver"])

What I have tried:

Serializing Java objects into JSON works for responses, but I'm having no luck serializing JSON into Java objects in my controllers.

Upvotes: 1

Views: 4518

Answers (3)

Andrei Sfat
Andrei Sfat

Reputation: 8606

You need to remove the attribute model from the parameter list. The problem if you enable FAIL_ON_EMPTY_BEANS for jackson, you will get a huge response back which contain a lot of information, which I am pretty sure you do not need.

I would return in the new ResponseEntity something else, like creating your own map, if that is your desire.

Upvotes: 3

Supun Dharmarathne
Supun Dharmarathne

Reputation: 1148

Try this.

public class MapSerializer extends JsonSerializer<SpecialMap> {
    @Override
    public void serialize(SpecialMap map, JsonGenerator jgen,
                          SerializerProvider provider) throws IOException,
            JsonProcessingException {
        jgen.writeStartObject();
        for (String key : map.keySet()) {
            jgen.writeStringField(key, map.get(key));
        }
        jgen.writeEndObject();
    }
}


public class SpecialMap extends HashMap<String,String> {
}


@RequestMapping(value = "/zone/settings/ranged/update", method = {RequestMethod.POST}, produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Map<String, Object>> zoneSettingsRangedUpdate(
            @RequestBody RoundRangeData data
    ) throws IOException {

        Map<String, Object> model = new HashMap<>();
        ObjectMapper mapper = new ObjectMapper();

        SimpleModule module = new SimpleModule();
        module.addSerializer(SpecialMap.class, new MapSerializer());
        mapper.registerModule(module);

        String serialized = mapper.writeValueAsString(data);
       // return serialized;
        model.put("request", serialized);
        model.put("success",true);

        return new ResponseEntity<Map<String, Object>>(model, HttpStatus.OK);
    }

See the image of successful response. enter image description here

Upvotes: 2

cralfaro
cralfaro

Reputation: 5948

You only need to implement Serializble in your pojo

public class RoundRangeData implements Serializable {
    //code
}

Upvotes: 1

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