https://www.graalvm.org/ 
public interface org.graalvm.libgraal.jni.JNI$JNIEnv extends org.graalvm.word.PointerBase
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.graalvm.libgraal.jni.JNI$JNIEnv
  super_class: java.lang.Object
{
  public abstract org.graalvm.libgraal.jni.JNI$JNINativeInterface getFunctions();
    descriptor: ()Lorg/graalvm/libgraal/jni/JNI$JNINativeInterface;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.struct.CField(value = "functions")
}
SourceFile: "JNI.java"
NestHost: org.graalvm.libgraal.jni.JNI
InnerClasses:
  public abstract JNIEnv = org.graalvm.libgraal.jni.JNI$JNIEnv of org.graalvm.libgraal.jni.JNI
  public abstract JNINativeInterface = org.graalvm.libgraal.jni.JNI$JNINativeInterface of org.graalvm.libgraal.jni.JNI
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.CContext(value = Lorg/graalvm/libgraal/jni/JNI$JNIHeaderDirectives;)
      org.graalvm.nativeimage.c.struct.CStruct(value = "JNIEnv_", addStructKeyword = true)