https://www.graalvm.org/ 
class org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut extends org.graalvm.component.installer.TestBase$FeedbackAdapter
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut
  super_class: org.graalvm.component.installer.TestBase$FeedbackAdapter
{
  private java.util.List<org.graalvm.component.installer.InstallerCommandlineTest$Msg> err;
    descriptor: Ljava/util/List;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/List<Lorg/graalvm/component/installer/InstallerCommandlineTest$Msg;>;

  private java.util.List<org.graalvm.component.installer.InstallerCommandlineTest$Msg> out;
    descriptor: Ljava/util/List;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/List<Lorg/graalvm/component/installer/InstallerCommandlineTest$Msg;>;

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

  void <init>(org.graalvm.component.installer.InstallerCommandlineTest);
    descriptor: (Lorg/graalvm/component/installer/InstallerCommandlineTest;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
         0: .line 131
            aload 0 /* this */
            aload 1
            putfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.this$0:Lorg/graalvm/component/installer/InstallerCommandlineTest;
            aload 0 /* this */
            aload 1
            invokespecial org.graalvm.component.installer.TestBase$FeedbackAdapter.<init>:(Lorg/graalvm/component/installer/TestBase;)V
         1: .line 132
            aload 0 /* this */
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            putfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.err:Ljava/util/List;
         2: .line 133
            aload 0 /* this */
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            putfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.out:Ljava/util/List;
         3: .line 131
            return
        end local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/graalvm/component/installer/InstallerCommandlineTest$CaptureOut;
    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=6, locals=4, args_size=4
        start local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
        start local 1 // java.lang.String key
        start local 2 // java.lang.Throwable t
        start local 3 // java.lang.Object[] params
         0: .line 137
            aload 0 /* this */
            getfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.err:Ljava/util/List;
            new org.graalvm.component.installer.InstallerCommandlineTest$Msg
            dup
            aload 1 /* key */
            aload 3 /* params */
            aload 2 /* t */
            invokespecial org.graalvm.component.installer.InstallerCommandlineTest$Msg.<init>:(Ljava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         1: .line 138
            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.InstallerCommandlineTest$CaptureOut this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/graalvm/component/installer/InstallerCommandlineTest$CaptureOut;
            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  

  public void output(java.lang.String, java.lang.Object[]);
    descriptor: (Ljava/lang/String;[Ljava/lang/Object;)V
    flags: (0x0081) ACC_PUBLIC, ACC_VARARGS
    Code:
      stack=6, locals=3, args_size=3
        start local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
        start local 1 // java.lang.String bundleKey
        start local 2 // java.lang.Object[] params
         0: .line 142
            aload 0 /* this */
            getfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.out:Ljava/util/List;
            new org.graalvm.component.installer.InstallerCommandlineTest$Msg
            dup
            aload 1 /* bundleKey */
            aload 2 /* params */
            aconst_null
            invokespecial org.graalvm.component.installer.InstallerCommandlineTest$Msg.<init>:(Ljava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         1: .line 143
            return
        end local 2 // java.lang.Object[] params
        end local 1 // java.lang.String bundleKey
        end local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/graalvm/component/installer/InstallerCommandlineTest$CaptureOut;
            0    2     1  bundleKey  Ljava/lang/String;
            0    2     2     params  [Ljava/lang/Object;
    MethodParameters:
           Name  Flags
      bundleKey  
      params     

  public void message(java.lang.String, java.lang.Object[]);
    descriptor: (Ljava/lang/String;[Ljava/lang/Object;)V
    flags: (0x0081) ACC_PUBLIC, ACC_VARARGS
    Code:
      stack=6, locals=3, args_size=3
        start local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
        start local 1 // java.lang.String bundleKey
        start local 2 // java.lang.Object[] params
         0: .line 147
            aload 0 /* this */
            getfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.out:Ljava/util/List;
            new org.graalvm.component.installer.InstallerCommandlineTest$Msg
            dup
            aload 1 /* bundleKey */
            aload 2 /* params */
            aconst_null
            invokespecial org.graalvm.component.installer.InstallerCommandlineTest$Msg.<init>:(Ljava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
         1: .line 148
            return
        end local 2 // java.lang.Object[] params
        end local 1 // java.lang.String bundleKey
        end local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/graalvm/component/installer/InstallerCommandlineTest$CaptureOut;
            0    2     1  bundleKey  Ljava/lang/String;
            0    2     2     params  [Ljava/lang/Object;
    MethodParameters:
           Name  Flags
      bundleKey  
      params     

  public boolean verbatimOut(java.lang.String, boolean);
    descriptor: (Ljava/lang/String;Z)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
        start local 1 // java.lang.String msg
        start local 2 // boolean beVerbose
         0: .line 152
            getstatic java.lang.System.err:Ljava/io/PrintStream;
            ldc ""
            invokevirtual java.io.PrintStream.println:(Ljava/lang/String;)V
         1: .line 153
            iconst_0
            ireturn
        end local 2 // boolean beVerbose
        end local 1 // java.lang.String msg
        end local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/graalvm/component/installer/InstallerCommandlineTest$CaptureOut;
            0    2     1        msg  Ljava/lang/String;
            0    2     2  beVerbose  Z
    MethodParameters:
           Name  Flags
      msg        
      beVerbose  

  public java.lang.String l10n(java.lang.String, java.lang.Object[]);
    descriptor: (Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;
    flags: (0x0081) ACC_PUBLIC, ACC_VARARGS
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
        start local 1 // java.lang.String key
        start local 2 // java.lang.Object[] params
         0: .line 158
            ldc "Installer_BuiltingCatalogURL"
            aload 1 /* key */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 159
            aload 0 /* this */
            getfield org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut.this$0:Lorg/graalvm/component/installer/InstallerCommandlineTest;
            getfield org.graalvm.component.installer.InstallerCommandlineTest.testCatalogURL:Ljava/lang/String;
            areturn
         2: .line 161
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* key */
            aload 2 /* params */
            invokespecial org.graalvm.component.installer.TestBase$FeedbackAdapter.l10n:(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;
            areturn
        end local 2 // java.lang.Object[] params
        end local 1 // java.lang.String key
        end local 0 // org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lorg/graalvm/component/installer/InstallerCommandlineTest$CaptureOut;
            0    3     1     key  Ljava/lang/String;
            0    3     2  params  [Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      key     
      params  
}
SourceFile: "InstallerCommandlineTest.java"
NestHost: org.graalvm.component.installer.InstallerCommandlineTest
InnerClasses:
  CaptureOut = org.graalvm.component.installer.InstallerCommandlineTest$CaptureOut of org.graalvm.component.installer.InstallerCommandlineTest
  Msg = org.graalvm.component.installer.InstallerCommandlineTest$Msg of org.graalvm.component.installer.InstallerCommandlineTest
  public FeedbackAdapter = org.graalvm.component.installer.TestBase$FeedbackAdapter of org.graalvm.component.installer.TestBase