http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
final class io.netty.handler.codec.smtp.SmtpUtils
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.smtp.SmtpUtils
  super_class: java.lang.Object
{
  static java.util.List<java.lang.CharSequence> toUnmodifiableList(java.lang.CharSequence[]);
    descriptor: ([Ljava/lang/CharSequence;)Ljava/util/List;
    flags: (0x0088) ACC_STATIC, ACC_VARARGS
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.CharSequence[] sequences
         0: .line 25
            aload 0 /* sequences */
            ifnull 1
            aload 0 /* sequences */
            arraylength
            ifne 2
         1: .line 26
      StackMap locals:
      StackMap stack:
            invokestatic java.util.Collections.emptyList:()Ljava/util/List;
            areturn
         2: .line 28
      StackMap locals:
      StackMap stack:
            aload 0 /* sequences */
            invokestatic java.util.Arrays.asList:([Ljava/lang/Object;)Ljava/util/List;
            invokestatic java.util.Collections.unmodifiableList:(Ljava/util/List;)Ljava/util/List;
            areturn
        end local 0 // java.lang.CharSequence[] sequences
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0  sequences  [Ljava/lang/CharSequence;
    Signature: ([Ljava/lang/CharSequence;)Ljava/util/List<Ljava/lang/CharSequence;>;
    MethodParameters:
           Name  Flags
      sequences  

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.smtp.SmtpUtils this
         0: .line 31
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.handler.codec.smtp.SmtpUtils this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/smtp/SmtpUtils;
}
SourceFile: "SmtpUtils.java"