SnakeYaml error cannot create property error

I'm trying to read and write the yaml file using SnakeYaml.
here is the code :

public class SnakeYaml {

	public static void main(String[] args) throws FileNotFoundException {
		// TODO Auto-generated method stub
		
		InputStream inputStream = new FileInputStream(new File("C:\\yaml\\student.yaml"));
	
		Representer representer = new Representer();
		 representer.getPropertyUtils().setSkipMissingProperties(true);

		Yaml yaml = new Yaml(new Constructor(Values.class),representer);
	//	Map<String, Object> data = yaml.load(inputStream);
		
		Values data = yaml.load(inputStream);
		System.out.println(data);

	}
}

public class Values {
	
	 private List<Image> image;
	 private String id;
	 private String name;
	 private String year;
	 private String address;
	 public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getYear() {
		return year;
	}

	public void setYear(String year) {
		this.year = year;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public String getDepartment() {
		return department;
	}

	public void setDepartment(String department) {
		this.department = department;
	}

	private String department;
	 
	 
	 public Values()
	 {
		 
	 }
	 
	 public Values (List<Image> image, String id, String name, String year, String address, String department )
	 {
		 super ();
		 this.image = image;
		 this.id = id;
		 this.name = name;
		 this.year = year;
		 this.address = address;
		 this.department = department;
		 
		 
	 }

	public List<Image> getImage() {
		return image;
	}

	public void setImage(List<Image> image) {
		this.image = image;
	}
}


public class Image {
	
	private String repository;
	private String pullPolicy;
	private String tag;
	
	public Image()
	{
		
	}
	
	public Image (String repository, String pullPolicy, String tags)
	{
		super();
		this.repository = repository;
		this.pullPolicy = pullPolicy;
		this.tag = tags;
		
	}
	
	public String getRepository() {
		return repository;
	}
	public void setRepository(String repository) {
		this.repository = repository;
	}
	public String getPullPolicy() {
		return pullPolicy;
	}
	public void setPullPolicy(String pullPolicy) {
		this.pullPolicy = pullPolicy;
	}
	public String getTag() {
		return tag;
	}
	public void setTag(String tag) {
		this.tag = tag;
	}
	

}

The yaml file is as below :

id: "20"
name: "Bruce"
year: "2020"
address: "Gotham City"
department: "Computer Science"
image:
  repository: "test.abc.com/test"
  pullPolicy: "IfNotPresent"
  tag: "xyz"

getting below error

> Exception in thread "main" Cannot create property=image for
> JavaBean=oe.kubeapi.abc.Values@1372ed45 in 'reader', line
> 1, column 1:
> id: "20"
> ^ No single argument constructor found for class oe.kubeapi.abc.Image in 'reader', line 7, column 3:
> repository: "test.abc.com/test ...
> ^

not sure which property is missing . please suggest

The problem is how you structured the yaml file. The type of image attribute in class Value is a List<Image>.

public class Values {
    private List<Image> image;
    // setter & getters & constructors
}

with your yaml file like

id: "20"
name: "Bruce"
year: "2020"
address: "Gotham City"
department: "Computer Science"
image:
  repository: "test.abc.com/test"
  pullPolicy: "IfNotPresent"
  tag: "xyz"

you are saying that image property is an object with three attributes (repository, pullPolicy, tag). You could also consider it as a dictionary with three key-value pairs, but not a list.

There are different ways of doing it. All of them are documented in the spec of yaml

  [
    { repository: "test.abc.com/test1", pullPolicy: "IfNotPresent1", tag: "xyz1" },
    { repository: "test.abc.com/test2", pullPolicy: "IfNotPresent2", tag: "xyz2" }
  ]

image:
  - { repository: "test.abc.com/test1", pullPolicy: "IfNotPresent1", tag: "xyz1" }
  - { repository: "test.abc.com/test2", pullPolicy: "IfNotPresent2", tag: "xyz2" }

image:
  - repository: "test.abc.com/test1"
    pullPolicy: "IfNotPresent1"
    tag: "xyz1"
  - repository: "test.abc.com/test2"
    pullPolicy: "IfNotPresent2"
    tag: "xyz2"

if you add the following lines to your main method

Values data = yaml.load(inputStream);
data.getImage().forEach(x -> System.out.println(x.getTag()));

you will see that the attribute tag from Image class is being printed in all the cases