Jackson 反序列化：无法识别的字段

从教程中我的印象是这应该可行（简化的示例）：

public class Foo {
    private String bar;
    public String getBar() {
        return bar;
    }
    public void setBar(String bar) {
        this.bar = bar;
    }
    public static class Qux {
        private String foobar;
        public String getFoobar() {
            return foobar;
        }
        public void setFoobar(String foobar) {
            this.foobar = foobar;
        }
    }
}
...

String in = "{ \"bar\": \"123\", \"qux\" : {\"foobar\": \"234\"}}";
ObjectMapper mapper = new ObjectMapper();
Foo obj = mapper.readValue(in, Foo.class);

但是，我收到错误

UnrecognizedPropertyException: Unrecognized field "qux" (Class Foo), not marked as ignorable

我正在运行2.2.2

您可以配置ObjectMapper忽略在你的类中找不到的字段

ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

如果未以这种方式配置，则在解析时如果发现无法识别您指定的类类型的字段，则会抛出异常。