https://www.graalvm.org/ 
public class com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature implements org.graalvm.nativeimage.hosted.Feature
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature
  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 // com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature this
         0: .line 373
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/diagnosticsagent/NativeImageDiagnosticsAgent$RegistrationFeature;

  public void afterRegistration(org.graalvm.nativeimage.hosted.Feature$AfterRegistrationAccess);
    descriptor: (Lorg/graalvm/nativeimage/hosted/Feature$AfterRegistrationAccess;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature this
        start local 1 // org.graalvm.nativeimage.hosted.Feature$AfterRegistrationAccess access
         0: .line 377
            new com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent
            dup
            invokespecial com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent.<init>:()V
            invokestatic com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent.access$0:(Lcom/oracle/svm/jvmtiagentbase/JvmtiAgentBase;)V
         1: .line 378
            return
        end local 1 // org.graalvm.nativeimage.hosted.Feature$AfterRegistrationAccess access
        end local 0 // com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lcom/oracle/svm/diagnosticsagent/NativeImageDiagnosticsAgent$RegistrationFeature;
            0    2     1  access  Lorg/graalvm/nativeimage/hosted/Feature$AfterRegistrationAccess;
    MethodParameters:
        Name  Flags
      access  
}
SourceFile: "NativeImageDiagnosticsAgent.java"
NestHost: com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent
InnerClasses:
  public RegistrationFeature = com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent$RegistrationFeature of com.oracle.svm.diagnosticsagent.NativeImageDiagnosticsAgent
  public abstract AfterRegistrationAccess = org.graalvm.nativeimage.hosted.Feature$AfterRegistrationAccess of org.graalvm.nativeimage.hosted.Feature