https://openjdk.java.net/ 
public interface com.sun.media.sound.ReferenceCountingDevice
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.media.sound.ReferenceCountingDevice
  super_class: java.lang.Object
{
  public abstract javax.sound.midi.Receiver getReceiverReferenceCounting();
    descriptor: ()Ljavax/sound/midi/Receiver;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws javax.sound.midi.MidiUnavailableException

  public abstract javax.sound.midi.Transmitter getTransmitterReferenceCounting();
    descriptor: ()Ljavax/sound/midi/Transmitter;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws javax.sound.midi.MidiUnavailableException
}
SourceFile: "ReferenceCountingDevice.java"