Process nested YAML file in scala

Question

I have a nested YAML file as below and I want to process it in scala with snakeyaml.Yaml however I encounter an error: Unable to find property 'myMap' on class MyConfig

Here is an example of the Yaml file that I have:

myMap:
-
 name: key1
 value: value1
-
 name: key2
 value: value2

I defined two classes for the YAML structure. I am using org.yaml.snakeyaml.Yaml to do yaml.load

class ConfigParamsKeyValue {
  @BeanProperty var name: String = null
  @BeanProperty var value: String = null
}

class MyConfig{
  @BeanProperty var myMap= new java.util.ArrayList[ConfigParamsKeyValue]();
}

def loadConfig(filename : String): MyConfig = {
   val yaml = new Yaml(new Constructor(classOf[MyConfig]))
   val stream = new FileInputStream(filename)
   try {
     val obj = yaml.load(stream)
     obj.asInstanceOf[MyConfig]
   } finally {
   stream.close()
  }
}