Gryo reader / writer is broken in JanusGraph 1.0.0

[porunov]

As noted in the changelog: https://docs.janusgraph.org/changelog/#drop-support-for-gryo-messageserializer
Gryo MessageSerializer has been dropped in TinkerPop 3.6.0. However, TinkerPop documentation says that Gryo may still be used for file based applications.

For confirmed bugs, please report:

• Version: 1.0.0
• Storage Backend: -
• Mixed Index Backend: -
• Expected Behavior: file is created with kryo format.
• Current Behavior: an exception is thrown: Method threw 'java.lang.IllegalArgumentException' exception..
• Steps to Reproduce:
  Try to read or write any graph using kryo serialization.

g.io("graph.kryo").read().iterate()
g.io("graph.kryo").write().iterate()

Stack Trace (if you have one)

Unable to create serializer "org.apache.tinkerpop.shaded.kryo.serializers.FieldSerializer" for class: java.util.concurrent.atomic.AtomicLong