Search code examples
scalayamlsnakeyaml

SnakeYaml issue in scala

I'm trying to figure out how to use nested data types with snakeyaml. I'm not able to get the inner class to display properly

class RawEdgeTypeSpec() {
  @BeanProperty var edge_type: Int = -1
  @BeanProperty var weighted: String = ""
}

class RawNodeTypeSpec {
  @BeanProperty var node_type: Int = -1
  @BeanProperty var edge_types: List[RawEdgeTypeSpec] = List()
}


    val spec3 = new RawEdgeTypeSpec()
    spec3.setEdge_type(2)
    spec3.setWeighted("true")
    val spec2 = new RawNodeTypeSpec()
    spec2.setNode_type(2)
    spec2.setEdge_types(List(spec3))

    val output = new Yaml().dump(spec2)

This prints

edge_types: !!scala.collection.immutable.$colon$colon {}
node_type: 2

edge_types is not recognized and serialized properly

Similarly I'm having trouble deserializing yaml

Solution

  • SnakeYAML is a Java lib that doesn't know Scala, so you'll need to use java.util.List[RawEdgeTypeSpec] for SnakeYAML to understand that this is a list.