java-读取YAML文件-线程“main”中的异常无法在读取器中创建property=envs

Question

加载YAML文件（使用SnakeYAML）时，im得到一个异常“线程中的异常”main“不能为javabean=com.java.envs@3d82c5f3创建property=envs在'reader'第1行第1列：envs:1)im做错了什么？-env应该从envs：的同一位置开始？

    public class Envs {
        List<Environment_Generic> envList;

        public List<Environment_Generic> getEnvList() {
            return envList;
        }

        public void setEnvList(List<Environment_Generic> envList) {
            this.envList = envList;
        }
    }

public class Environment_Generic {

    private String env;
    private String firstName;

    public String getEnv() {
        return env;
    }

    public void setEnv(String env) {
        this.env = env;
    }

    private String lastName;
    private int age;
    private List<Contact> contactDetails;
    private Address homeAddress;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public List<Contact> getContactDetails() {
        return contactDetails;
    }

    public void setContactDetails(List<Contact> contactDetails) {
        this.contactDetails = contactDetails;
    }

    public Address getHomeAddress() {
        return homeAddress;
    }

    public void setHomeAddress(Address homeAddress) {
        this.homeAddress = homeAddress;
    }

}

   public static Envs loadYAML(String file) throws IOException{

        Yaml yaml = new Yaml(new Constructor(Envs.class));
        InputStream inputStream = new FileInputStream(new File("src/main/resources/" + file));
        Envs envs = yaml.load(inputStream);
        return envs;
    }
Envs envs=loadYAML("test1.yml");
       System.out.println(envs.getEnvList().get(0).getHomeAddress().getCity());

Answer 1

检查有关typesafe集合的文档，文档的根元素是不必要的。删除根Envs参数。

当前，对象图是一个名为envs的Environment_Generic列表。但是，您想要的（并尝试映射）只是列表本身。