https://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public interface com.sun.javafx.runtime.async.AsyncOperationListener<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.javafx.runtime.async.AsyncOperationListener
  super_class: java.lang.Object
{
  public abstract void onProgress(int, int);
    descriptor: (II)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
               Name  Flags
      progressValue  
      progressMax    

  public abstract void onCompletion();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TV;)V
    MethodParameters:
       Name  Flags
      value  

  public abstract void onCancel();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void onException(java.lang.Exception);
    descriptor: (Ljava/lang/Exception;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      e     
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "AsyncOperationListener.java"