in chill-scala/src/main/scala/com/twitter/chill/Externalizer.scala [170:177]
private def maybeWriteJavaKryo(out: ObjectOutput, kryo: KryoInstantiator): Unit =
writeJava(out) || writeKryo(out, kryo) || {
val inner = get
sys.error(
"Neither Java nor Kryo works for class: %s instance: %s\nexport CHILL_EXTERNALIZER_DEBUG=true to see both stack traces"
.format(inner.getClass, inner)
)
}