http://picocli.info: Java command line parser with both an annotations API and a programmatic API. Usage help with ANSI styles and colors. Autocomplete. Nested subcommands. Easily included as source to avoid adding a dependency.
  • Remko Popma 
class picocli.AutoComplete$NullFunction implements picocli.AutoComplete$Function<java.lang.CharSequence, java.lang.String>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: picocli.AutoComplete$NullFunction
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // picocli.AutoComplete$NullFunction this
         0: .line 261
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // picocli.AutoComplete$NullFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lpicocli/AutoComplete$NullFunction;

  public java.lang.String apply(java.lang.CharSequence);
    descriptor: (Ljava/lang/CharSequence;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // picocli.AutoComplete$NullFunction this
        start local 1 // java.lang.CharSequence value
         0: .line 262
            aload 1 /* value */
            invokeinterface java.lang.CharSequence.toString:()Ljava/lang/String;
            areturn
        end local 1 // java.lang.CharSequence value
        end local 0 // picocli.AutoComplete$NullFunction this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lpicocli/AutoComplete$NullFunction;
            0    1     1  value  Ljava/lang/CharSequence;
    MethodParameters:
       Name  Flags
      value  

  public java.lang.Object apply(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.CharSequence
            invokevirtual picocli.AutoComplete$NullFunction.apply:(Ljava/lang/CharSequence;)Ljava/lang/String;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lpicocli/AutoComplete$Function<Ljava/lang/CharSequence;Ljava/lang/String;>;
SourceFile: "AutoComplete.java"
NestHost: picocli.AutoComplete
InnerClasses:
  private abstract Function = picocli.AutoComplete$Function of picocli.AutoComplete
  private NullFunction = picocli.AutoComplete$NullFunction of picocli.AutoComplete