https://openjdk.java.net/ 
public interface jdk.nashorn.internal.runtime.logging.Loggable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.nashorn.internal.runtime.logging.Loggable
  super_class: java.lang.Object
{
  public abstract jdk.nashorn.internal.runtime.logging.DebugLogger initLogger(jdk.nashorn.internal.runtime.Context);
    descriptor: (Ljdk/nashorn/internal/runtime/Context;)Ljdk/nashorn/internal/runtime/logging/DebugLogger;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      context  final

  public abstract jdk.nashorn.internal.runtime.logging.DebugLogger getLogger();
    descriptor: ()Ljdk/nashorn/internal/runtime/logging/DebugLogger;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "Loggable.java"