gistfile1.java

public final class ImmutableDummy {
    public final Integer x;
    public final Option<Integer> y;

    @JsonCreator
    public ImmutableDummy(@JsonProperty("x") Integer x,
                          @JsonProperty("y") Integer y) {

        this.x = x;
        this.y = Option.apply(y);
    }
}

@Test
    public void test() throws IOException {

      String json1 = "{\n" +
        "  \"x\": 1,\n" +
        "  \"y\": 2\n" +
        "}";
      String json2 = "{\n" +
        "  \"x\": 1\n" +
        "}";
      String json3 = "{\n" +
        "  \"x\": 1,\n" +
        "  \"y\": null\n" +
        "}";
      String json4 = "{\n" +
        "  \"x\": 1,\n" +
        "  \"y\": \"t\"\n" +
        "}";
      ImmutableDummy result1 = SingleObjectMapper.mapper().readValue(json1, ImmutableDummy.class);
      assertThat(result1.x, is(1));
      assertThat(result1.y, is(Option.apply(2)));
      ImmutableDummy result2 = SingleObjectMapper.mapper().readValue(json2, ImmutableDummy.class);
      assertThat(result2.x, is(1));
      assertThat(result2.y.isDefined(), is(false));
      ImmutableDummy result3 = SingleObjectMapper.mapper().readValue(json3, ImmutableDummy.class);
      assertThat(result3.x, is(1));
      assertThat(result3.y.isDefined(), is(false));
      ImmutableDummy result4 = SingleObjectMapper.mapper().readValue(json4, ImmutableDummy.class);
      assertThat(result4.x, is(1));
      assertThat(result4.y.isDefined(), is(false));
    }