JYAML: Serialize/deserialize nested/inner classes

Question

First of all, Merry Christmas to everyone!

Now to my question: Let's say I have the class Outer with some inner class Inner. As a field in Outer, I have a List<Inner>, which i then want to dump to a YAML file. I do this like so:

Outer o = new Outer();
o.innerList = new ArrayList<Inner>();
o.innerList.add(new o.Inner());
...
Yaml.dump(o, new File("test.yml");

This gives me the exception: Exception in thread "main" org.ho.yaml.exception.ObjectCreationException: Error near line 0: Can't create object of type class game.Outer$Inner using default constructor.

I tried providing a custom constructor and changing the access level to public, to no help. Any ideas?

Answer 1

First thing is check that YAML supports the Inner class serialization.

Answer 2

SnakeYAML has a lot of examples with inner classes. How does the YAML document (test.yml) look like ? Is Inner a static inner class ?