`FAIL_ON_NULL_FOR_PRIMITIVES` failure does not indicate field name in exception message

public class Test {

    private String type;
    private long num;

    @JsonCreator
    public Test(@JsonProperty(value = "type", required = true) String type,
                @JsonProperty(value = "num", required = true) long num) {
        this.type = type;
        this.num = num;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public long getNum() {
        return num;
    }

    public void setNum(long num) {
        this.num = num;
    }
}

ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES, true);

        try {
            String json = "{ \"type\" : \"number\", \"num\":null }";
            Test car = objectMapper.readValue(json, Test.class);

            System.out.println(car.getNum());
        } catch (MismatchedInputException ex) {
            ex.getPath().forEach(it -> System.out.println("field: " + it.getFieldName()));
        }

shows field: num but missing field in json

ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES, true);

        try {
            String json = "{ \"type\" : \"number\" }";
            Test car = objectMapper.readValue(json, Test.class);

            System.out.println(car.getNum());
        } catch (MismatchedInputException ex) {
            ex.getPath().forEach(it -> System.out.println("field: " + it.getFieldName()));
        }

shows nothing

Please add filed name and in this case.

[cowtowncoder]

@raderio Actually, come to think of it bit more, I wonder if I was wrong. Reference mentions “field” or “key”, in Java context, and not in input source.

I’ll have to think bit more about this after all, since that being the case, it is not unreasonable it would be populated if there is sufficient information to do so.

[WellingR]

I also encountered this issue and wanted to report this. I have a potential fix ready and will create a PR soon