Exception in thread "main" com.beust.klaxon.KlaxonException: Couldn't find a suitable constructor for class Data to initialize with {number=123.456}: java.lang.IllegalArgumentException argument type ...

The basic gist of it is that for this special 64-bit floating point value, the Java call Double.parseDouble("2.2250738585072012e-308") will get stuck in an infinite loop. Read the link above to ...