java - 使用 FasterXML 解析带有别名的 yml 文件

Question

我有一个包含多个对象的 yaml 文件和一个使用 yaml v1.2 规范中的锚点/别名（&/*）的列表：

key1:
  subkey: &myalias
    - attr1: valueX
      attr2: valueY
      attr3: valueZ
    - attr1: another_valueX
      attr2: another_valueY
      attr3: another_valueZ
key2:
  subkey: *myalias

我有以下 Java 类：

package com.acme.model;

import lombok.Data;
import java.io.Serializable;

@Data
public class FileObject implements Serializable {

    private KeyObject key1;
    private KeyObject key2;

    public FileObject() {}

}

---

package com.acme.model;

import lombok.Data;
import java.io.Serializable;

@Data
public class KeyObject implements Serializable {

    private SubkeyList subkey;

    public KeyObject() {}

}

---

package com.acme.model;

import com.fasterxml.jackson.annotation.JsonIdentityInfo;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import lombok.Data;
import java.io.Serializable;
import java.util.ArrayList;

@Data
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "subkeyId")
public class SubkeyList extends ArrayList<SubkeyObject> implements Serializable {

    private String subkeyId;

    public SubkeyList() {}

}

---

package com.acme.model;

import lombok.Data;
import java.io.Serializable;

@Data
public class SubkeyObject implements Serializable {

    private String attr1;

    private String attr2;

    private String attr3;

    public SubkeyObject() {}

}

我正在尝试按如下方式解析文件以获取 FileObject：

ObjectReader reader = new ObjectMapper(new YAMLFactory()).readerFor(FileObject.class);
InputStream in = this.getClass().getClassLoader().getResourceAsStream("file.yml");
FileObject fileObject = reader.readValue(in);

但是发生了以下异常：

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.acme.model.SubkeyList<com.acme.model.SubkeyObject>` out of VALUE_STRING token
 at [Source: (BufferedInputStream); line: 10, column: 11] (through reference chain: com.acme.model.FileObject["key2"]->com.acme.model.KeyObject["subkey"])

我还没有找到将别名和锚点与列表或地图一起使用的文档，仅与对象一起使用。

标签： javayamlfasterxmlaliases