为什么我不能用SnakeYaml和Lombok解析yaml字符串？

Question

package main;

import lombok.Data;
import lombok.experimental.Accessors;

@Data
@Accessors(chain = true)
public class YamlConfig {
    private String text;
}

public static void loadYaml(){
    Yaml yaml = new Yaml(new Constructor(YamlConfig.class));
    YamlConfig config = yaml.load("text: testText");
    log.info("text is {}",config.getText());
}

Exception in thread "main" Cannot create property=text for JavaBean=YamlConfig(text=null)
 in 'string', line 1, column 1:
    text: testText
    ^
No writable property 'text' on class: main.YamlConfig
 in 'string', line 1, column 7:
    text: testText
          ^

    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:291)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:172)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:332)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:230)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:220)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:174)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:158)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:491)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:416)
    at main.YamlLombok.loadYaml(YamlLombok.java:16)
    at main.YamlLombok.main(YamlLombok.java:11)
Caused by: org.yaml.snakeyaml.error.YAMLException: No writable property 'text' on class: main.YamlConfig
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:235)
    ... 10 more

当我将Bean字段切换到public时，所有工作都很好，但我真的想使用getter和setter（最好是由Lombok生成的）。

Answer 1

我无法解析的原因是

@Accessors(chain = true)

这会导致setter返回this而不是void。

解决方案是将snakeyaml配置为使用这些setter

yaml.setBeanAccess(BeanAccess.FIELD);