https://www.graalvm.org/ 
public interface com.oracle.truffle.api.object.ShapeListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.object.ShapeListener
  super_class: java.lang.Object
{
  public abstract void onPropertyTransition(java.lang.Object);
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      key   
}
SourceFile: "ShapeListener.java"
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()