https://openjdk.java.net/ 
public interface com.sun.xml.internal.bind.v2.runtime.AttributeAccessor<BeanT>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.xml.internal.bind.v2.runtime.AttributeAccessor
  super_class: java.lang.Object
{
  public abstract boolean isNilIncluded();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
Signature: <BeanT:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "AttributeAccessor.java"