¿Existe una regla de protección válida para RxJava y FasterXML?

Ahora, el único problema que me impide usar kotlin en producción es que no puedo encontrar un file de proguard correcto para ello.

Lo que utilicé:

1.Kotlin

2. Anko

3.Jackson-Kotlin-module

Aquí está el post de advertencia:

:app:proguardRelease Warning: com.fasterxml.jackson.databind.ext.DOMSerializer: can't find referenced class org.w3c.dom.bootstrap.DOMImplementationRegistry Warning: rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.ConcurrentCircularArrayQueue: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.ConcurrentSequencedCircularArrayQueue: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.MpmcArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.MpmcArrayQueueProducerField: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.MpscLinkedQueue: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.SpmcArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.SpmcArrayQueueProducerField: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.SpscArrayQueue: can't find referenced class sun.misc.Unsafe Warning: rx.internal.util.unsafe.UnsafeAccess: can't find referenced class sun.misc.Unsafe Warning: there were 41 unresolved references to classes or interfaces.