i\'m working with the youtube json from google-api-client :
{ \"apiVersion\": \"2.0\", \"data\": { \"updated\": \"2011-01-05T13:48:33.146Z\",
If you're using the @Key annotation for your mapped fields, you just need to make use of a custom value that can be passed to this annotation. So choose a legal name for your field and map it as @Key("default"):
@Key("default") private String defaultUrl;