https://www.graalvm.org/ 
public interface com.oracle.truffle.regex.tregex.util.json.JsonConvertible
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.regex.tregex.util.json.JsonConvertible
  super_class: java.lang.Object
{
  public abstract com.oracle.truffle.regex.tregex.util.json.JsonValue toJson();
    descriptor: ()Lcom/oracle/truffle/regex/tregex/util/json/JsonValue;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()
}
SourceFile: "JsonConvertible.java"
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives