JsonView doesn't work with JsonCreator

[dbolotin]

Consider the following example:

    public static class View {
    }

    public static class View1 extends View {
    }

    public static class View2 extends View {
    }

    @Test
    public void jacksonTest1() throws Exception {
        ObjectMapper om = new ObjectMapper();
        ObjectWriter w1 = om.writerWithView(View1.class);
        ObjectWriter w2 = om.writerWithView(View2.class);
        ObjectReader r1 = om.readerFor(Obj.class).withView(View1.class);
        ObjectReader r2 = om.readerFor(Obj.class).withView(View2.class);
        Obj o = new Obj("a", "b", "c");
        String so0 = om.writeValueAsString(o);
        System.out.println(so0); // {"a":"a","b":"b","c":"c"}
        String so1 = w1.writeValueAsString(o);
        System.out.println(so1); // {"a":"a","b":"b"}
        String so2 = w2.writeValueAsString(o);
        System.out.println(so2); // {"a":"a","c":"c"}

        System.out.println(r1.readValue(so0).toString()); // See below
    }

(1) Obj definition without @JsonCreator

    @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.PUBLIC_ONLY,
            isGetterVisibility = JsonAutoDetect.Visibility.NONE,
            getterVisibility = JsonAutoDetect.Visibility.NONE)
    @JsonIgnoreProperties(ignoreUnknown = true)
    public static class Obj {
        public String a;

        @JsonView(View1.class)
        public String b;

        @JsonView(View2.class)
        public String c;

        public Obj() {
        }

        public Obj() {
        }

        public Obj(String a,
                   String b,
                   String c) {
            this.a = a;
            this.b = b;
            this.c = c;
        }

        @Override
        public String toString() {
            return "Obj{" +
                    "a='" + a + '\'' +
                    ", b='" + b + '\'' +
                    ", c='" + c + '\'' +
                    '}';
        }
    }

(2) Obj definition with @JsonCreator

    @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.PUBLIC_ONLY,
            isGetterVisibility = JsonAutoDetect.Visibility.NONE,
            getterVisibility = JsonAutoDetect.Visibility.NONE)
    @JsonIgnoreProperties(ignoreUnknown = true)
    public static class Obj {
        public String a;

        @JsonView(View1.class)
        public String b;

        @JsonView(View2.class)
        public String c;

        public Obj() {
        }

        @JsonCreator
        public Obj(@JsonProperty("a") String a,
                   @JsonProperty("b") String b,
                   @JsonProperty("c") String c) {
            this.a = a;
            this.b = b;
            this.c = c;
        }

        @Override
        public String toString() {
            return "Obj{" +
                    "a='" + a + '\'' +
                    ", b='" + b + '\'' +
                    ", c='" + c + '\'' +
                    '}';
        }
    }

The problem:

Example works with first (1) variant of Obj definition. And outputs:

Obj{a='a', b='b', c='null'}

but fails to ignore field c with Obj defined with JsonCreator (2):

Obj{a='a', b='b', c='c'}

[Praytic]

If someone also experiencing the same issue here's the temporary fix. You can put the @JsonView annotation on every method's parameter.

@JsonCreator
public Obj(@JsonProperty("a") String a,
           @JsonProperty("b") @JsonView(View1.class) String b,
           @JsonProperty("c") @JsonView(View2.class) String c) {
    this.a = a;
    this.b = b;
    this.c = c;
}

[cowtowncoder]

Note: suspecting this is due to issues with combining annotations between "regular" and @JsonCreator (constructor parameter) properties. So it would (need to be) fixed if and when Property Introspection handling is rewritten to allow proper merging of all annotations.

[JooHyukKim]

#4173 proves this has been fixed, after idk, like 4 versions 🤔

[cowtowncoder]

@JooHyukKim better late verification than never :)