我有一个抽象类的具体对象。
我在抽象类和子类上使用了注解，但是JSON输出看起来不太对，而且反序列化时总是出现异常。
我还在学习Jackson，不幸的是，很多关于这个主题的教程已经过时了。
下面是我的对象Map器在底部的类：

抽象类：

@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, property = "BTRFSPhysicalLocationItem")
@JsonSubTypes({
    @Type(name = "Snapshot", value = Snapshot.class),
    @Type(name = "Backup", value = Backup.class),
    @Type(name = "Subvolume", value = Subvolume.class)})
public abstract class BTRFSPhysicalLocationItem {

    private final String name;
    @JsonProperty
    private final Path location;

    /**
     * Makes a new subvolume instance with the specified location. May or may
     * not actually exist.
     *
     * @param location The location of the subvolume
     */
    @JsonCreator
    protected BTRFSPhysicalLocationItem(@JsonProperty(value = "location") Path location) {
        this.location = location;
        this.name = location.getFileName().toString();
    }

具体类别：

public class Subvolume extends BTRFSPhysicalLocationItem {

    /**
     * Creates a new subvolume with the specified path.The subvolume may or may
     * not exist at this point.
     *
     * @param location
     */
    @JsonCreator
    public Subvolume(@JsonProperty Path location) {
        super(location);
    }

Objectmapper块：

ObjectMapper MAPPER = new ObjectMapper();
List<Subvolume> SUBVOLUME_LIST = new ArrayList<>();
//Subvolume is populated by other methods it's not worth showing them here
System.out.println("\n\n");
                MAPPER.writeValue(System.out, SUBVOLUME_LIST);
                System.out.println("\n\n\n");
                var s = MAPPER.writeValueAsString(SUBVOLUME_LIST);
                List<Subvolume> list = MAPPER.readValue(s, new TypeReference<List<Subvolume>>() {
                });

输出JSON：[{"name":"WanderingEcho","location":"file:///home/sarah/NetBeansProjects/WanderingEcho/"}]

例外情况：

Aug 05, 2019 4:55:14 PM com.protonmail.sarahszabo.wanderingecho.btrfs.BTRFS <clinit>
SEVERE: null
com.fasterxml.jackson.databind.exc.InvalidTypeIdException: Missing type id when trying to resolve subtype of [simple type, class com.protonmail.sarahszabo.wanderingecho.btrfs.subvolume.Subvolume]: missing type id property 'BTRFSPhysicalLocationItem'
 at [Source: (String)"[{"name":"WanderingEcho","location":"file:///home/sarah/NetBeansProjects/WanderingEcho/"}]"; line: 1, column: 89] (through reference chain: java.util.ArrayList[0])

其他答案，如Jackson deserialization of polymorphic types建议使用ObjectMapper方法，但根据我读过的教程，这应该不是必要的。
不知道我做错了什么注解。