https://openjdk.java.net/ 
public class org.graalvm.compiler.hotspot.DefaultInstrumentation implements org.graalvm.compiler.hotspot.Instrumentation
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.graalvm.compiler.hotspot.DefaultInstrumentation
  super_class: java.lang.Object
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.hotspot.DefaultInstrumentation this
         0: .line 30
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.graalvm.compiler.hotspot.DefaultInstrumentation this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/hotspot/DefaultInstrumentation;
}
SourceFile: "DefaultInstrumentation.java"