Jackson 密钥解串器不是 called/recognized

Question

即使在我实现了自定义密钥反序列化器之后，我仍然不断收到此错误。调用处理程序链期间发生以下错误：

JsonMappingException with message 'Can not find a (Map) Key deserializer for type 
[simple type, class com.abc.xyz.da.kg.types.Attribute] 
(through reference chain: com.abc.xyz.da.kg.services.models.RelationshipBean2["entities"])'

RelationshipBean2 class

public class RelationshipBean2 {
     private ArrayList<Entity> entities;
     private String searchFilterQuery;
     private int resultCount;
     private Map<StructuralFeature, List<Object>> documentAttributeValues;
   // getters and setters

引用链 - 实体是从另一个推理元素扩展而来的接口。在实现 Element 的 class 中，我有以下 Map。我已经为 Element 写了一个 Mixin class，带有以下注释。

protected Map<Attribute, Object> attributeValues = new HashMap<Attribute, Object>();

这张地图是异常的来源：-

@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "@class")

public abstract class ElementMixin implements Element {

@JsonDeserialize(keyUsing = AttributeKeyDeserializer.class)
protected Map<Attribute, Object> attributeValues = new HashMap<Attribute, Object>();
}

我已经实现了密钥反序列化器并使用 SimpleModule 将其注册到 ObjectMapper。

我的解串器：-

public class AttributeKeyDeserializer extends KeyDeserializer {

public AttributeKeyDeserializer() {
    super();
}


@Override
public Object deserializeKey(String content, DeserializationContext context)
            throws IOException, JsonProcessingException {
   // ObjectMapper mapper = (ObjectMapper) context.getParser().getCodec();
   // Attribute attribute = mapper.readValue(content, Attribute.class);
   // return attribute.getID();
   return "Attr";
}

ObjectMapper 配置和反序列化器注册：-

final ObjectMapper mapper = new ObjectMapper();

MixinModule mixinModule = new MixinModule("KGMixinModule", new Version(1,
            0, 0, "SNAPSHOT"));
StructuralFeatureDeserializer structuralFeatureDeserializer = new StructuralFeatureDeserializer();
mixinModule.addDeserializer(StructuralFeature.class,
            structuralFeatureDeserializer);
mixinModule.addKeyDeserializer(StructuralFeature.class,
            new StructuralFeatureKeyDeserializer());
mixinModule.addKeyDeserializer(Attribute.class,
            new AttributeKeyDeserializer());
mapper.registerModule(mixinModule);

AnnotationIntrospector primary = new JaxbAnnotationIntrospector();
AnnotationIntrospector secondary = new JacksonAnnotationIntrospector();
AnnotationIntrospector pair = new AnnotationIntrospector.Pair(primary,
            secondary);
mapper.setAnnotationIntrospector(pair);

// Set up the provider
JacksonJaxbJsonProvider jaxbProvider = new JacksonJaxbJsonProvider();
jaxbProvider.setMapper(mapper);

这里的 MixinModule 扩展自 Jackson 的 SimpleModule

有人能指出我遗漏了什么吗，为什么没有调用解串器。我为此苦苦挣扎。

更多背景信息：我正在尝试在我不拥有的 API 之上编写 REST api，因此修改那些 classes 超出了范围。我只能使用 Jackson v1.9.13

如有任何帮助，我们将不胜感激。

Answer 1

我终于找到问题所在了。我在 Super class mixin 中添加了带注释的 Map 字段，而该字段实际上存在于子 class 之一中。我假设 Mixin class 会在 Super class 中添加该字段。

最后，我为那个子 class 创建了一个 Mixin class 并在那里添加了带注释的字段并且一切正常。

Jackson 密钥解串器不是 called/recognized

Jackson key deserializer not being called/recognized

java

serialization

mixins

jackson