CODEWITHSUNDEEP
groovysnakeyaml
MFIhsan
MFIhsan

Reputation: 1057

SnakeYaml - How to convert a yaml to list of pojos with `TypeDescription` configuration set?

I have a simple YAML data like this that I'm trying to convert to a POJO object called Person using SnakeYaml.

age: 123
name: Jackson
phone:
  number: 123456

Here is the Groovy code that does it.

@ToString
class Person{
    def name
    def age
    Tel phone
}

@ToString
class Tel{
    def number
}

Constructor c = new Constructor(Person.class);
TypeDescription t = new TypeDescription(Person.class);
t.putListPropertyType("phone", Tel.class);
c.addTypeDescription(t);

def person = new Yaml(c).load(input)
println person

This creates the Person object as expected with Tel inside it.

However, when I try to pass a list of Person in yaml as follows, I'm getting an error.

- age: 123
  name: Jackson
  phone:
    number: 123456
- age: 234
  name: Jackson
  phone:
    number: 123456

Here is the error I get

Caused by: org.yaml.snakeyaml.error.YAMLException: No suitable constructor with 2 arguments found     for class soapunit.Person
    at org.yaml.snakeyaml.constructor.Constructor$ConstructSequence.construct(Constructor.java:587)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:340)
... 8 more

Upvotes: 1

Views: 2450

Answers (2)

El Marce
El Marce

Reputation: 3344

I agree with @cfrick, the error that you have in your example is that you are defining a list property, because you say this:

t.putListPropertyType("phone", Tel.class);

but in your Person class you define a single telephone:

class Person{
    def name
    def age
    Tel phone //<-- A SINGLE TELEPHONE!!!
}

To properly correct this, simply modify your Person class to:

class Person{
    def name
    def age
    List<Tel> phone //<-- A REAL LIST OF TELEPHONES!!!
}

Upvotes: 4

MFIhsan
MFIhsan

Reputation: 1057

I found the answer to my own question. I added explicit separator in the yaml content to make it work.

---
age: 123
name: Jackson
phone:
  number: 123456
---
age: 234
name: Jackson
phone:
  number: 123456

Upvotes: 0

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