https://www.graalvm.org/ 
class org.graalvm.component.installer.commands.InstallerTest$2FD extends org.graalvm.component.installer.TestBase$FeedbackAdapter
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.graalvm.component.installer.commands.InstallerTest$2FD
  super_class: org.graalvm.component.installer.TestBase$FeedbackAdapter
{
  java.util.List<java.lang.String> errors;
    descriptor: Ljava/util/List;
    flags: (0x0000) 
    Signature: Ljava/util/List<Ljava/lang/String;>;

  final org.graalvm.component.installer.commands.InstallerTest this$0;
    descriptor: Lorg/graalvm/component/installer/commands/InstallerTest;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(org.graalvm.component.installer.commands.InstallerTest);
    descriptor: (Lorg/graalvm/component/installer/commands/InstallerTest;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.graalvm.component.installer.commands.InstallerTest$2FD this
         0: .line 851
            aload 0 /* this */
            aload 1
            putfield org.graalvm.component.installer.commands.InstallerTest$2FD.this$0:Lorg/graalvm/component/installer/commands/InstallerTest;
            aload 0 /* this */
            aload 1
            invokespecial org.graalvm.component.installer.TestBase$FeedbackAdapter.<init>:(Lorg/graalvm/component/installer/TestBase;)V
         1: .line 852
            aload 0 /* this */
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            putfield org.graalvm.component.installer.commands.InstallerTest$2FD.errors:Ljava/util/List;
         2: .line 851
            return
        end local 0 // org.graalvm.component.installer.commands.InstallerTest$2FD this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/graalvm/component/installer/commands/InstallerTest$2FD;
    MethodParameters:
        Name  Flags
      this$0  final

  public void error(java.lang.String, java.lang.Throwable, java.lang.Object[]);
    descriptor: (Ljava/lang/String;Ljava/lang/Throwable;[Ljava/lang/Object;)V
    flags: (0x0081) ACC_PUBLIC, ACC_VARARGS
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // org.graalvm.component.installer.commands.InstallerTest$2FD this
        start local 1 // java.lang.String key
        start local 2 // java.lang.Throwable t
        start local 3 // java.lang.Object[] params
         0: .line 856
            aload 0 /* this */
            getfield org.graalvm.component.installer.commands.InstallerTest$2FD.errors:Ljava/util/List;
            aload 1 /* key */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         1: .line 857
            return
        end local 3 // java.lang.Object[] params
        end local 2 // java.lang.Throwable t
        end local 1 // java.lang.String key
        end local 0 // org.graalvm.component.installer.commands.InstallerTest$2FD this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/component/installer/commands/InstallerTest$2FD;
            0    2     1     key  Ljava/lang/String;
            0    2     2       t  Ljava/lang/Throwable;
            0    2     3  params  [Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      key     
      t       
      params  
}
SourceFile: "InstallerTest.java"
EnclosingMethod: org.graalvm.component.installer.commands.InstallerTest.testRevertInstallFailureDir:()V
NestHost: org.graalvm.component.installer.commands.InstallerTest
InnerClasses:
  public FeedbackAdapter = org.graalvm.component.installer.TestBase$FeedbackAdapter of org.graalvm.component.installer.TestBase
  FD = org.graalvm.component.installer.commands.InstallerTest$2FD