http://bytebuddy.net/byte-buddy-dep: Byte Buddy is a Java library for creating Java classes at run time. This artifact is a build of Byte Buddy with a remaining dependency onto ASM. You should never depend on this module without repackaging Byte Buddy and ASM into your own namespace. 
public interface net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional<U> extends net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition<U>, net.bytebuddy.dynamic.DynamicType$Builder<U>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional
  super_class: java.lang.Object
{
}
Signature: <U:Ljava/lang/Object;>Ljava/lang/Object;Lnet/bytebuddy/dynamic/DynamicType$Builder$FieldDefinition<TU;>;Lnet/bytebuddy/dynamic/DynamicType$Builder<TU;>;
SourceFile: "DynamicType.java"
NestHost: net.bytebuddy.dynamic.DynamicType
InnerClasses:
  public abstract Builder = net.bytebuddy.dynamic.DynamicType$Builder of net.bytebuddy.dynamic.DynamicType
  public abstract FieldDefinition = net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition of net.bytebuddy.dynamic.DynamicType$Builder
  public abstract Optional = net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional of net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition
  public abstract AbstractBase = net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional$AbstractBase of net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional
  public abstract Valuable = net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional$Valuable of net.bytebuddy.dynamic.DynamicType$Builder$FieldDefinition$Optional