无法识别的字段Jackson YAML Reader

Question

Main.java

 ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
            Model k = mapper.readValue(new File(PATH), Model.class);

Model.java

 public class Model {

        @JsonProperty
        private Specs details;

        private class Specs{
            @JsonProperty
            private String topic;

            @JsonProperty
            private String id;

            @JsonProperty
            private List<String> list;
        }
    }

yamlfile.yaml

details:
   topic: "test"
   id: "123"
   servers: [
            "test2"
            ]

I run main.java and get an exception:

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "details" (class Model), not marked as ignorable (0 known properties: ])
 at [Source: src/main/config/yamlfile.yaml; line: 2, column: 3] (through reference chain: Model["details"])

I have no idea what I am doing wrong here and I cant seem to find out the problem. Why is this unrecognized?

Answer 1

By default Jackson can access public fields for serialization and deserialization. If there's no public fields available then public getters/setters are used.

So: add getters/setters or add @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY) at the class level. For both classes, sure.