@ConstructorBinding 似乎在 Spring Boot 2.5.4 中不起作用

@ConstructorBinding seems not to work in Spring Boot 2.5.4

我正在使用 Spring Boot 2.5.4 并尝试从属性初始化一个不可变 class:

@Configuration
@ConfigurationProperties("test")
public class Config {
    public final String foo;
    
    @ConstructorBinding
    public Config(String foo) {
        this.foo = foo;
    }
}

application.yml:

test:
  foo: bar

主要class:

@SpringBootApplication
@ConfigurationPropertiesScan
public class Application implements CommandLineRunner {
    @Autowired Config config;
    public Application(Config config) {
        this.config = config;
    }

    public static void main(String[] args) { SpringApplication.run(Application.class, args); }

    @Override
    public void run(String... args) {
        System.out.println(config.foo);
    }
}

我希望它能启动并打印“bar”。但是,它无法以

开头
Parameter 0 of constructor in Config required a bean of type 'java.lang.String' that could not be found.

当我删除 @ConstructorBinding 并添加一个 setter 和 nullary 构造函数时,它确实有效。

在class级添加@ConstructorBinding。并删除 @Configuration 注释。像这样,

@ConstructorBinding
@ConfigurationProperties("test")
public class Config {
    public final String foo;
    
    public Config(String foo) {
        this.foo = foo;
    }
}