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) 
public final class io.netty.example.memcache.binary.MemcacheClient
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.example.memcache.binary.MemcacheClient
  super_class: java.lang.Object
{
  static final boolean SSL;
    descriptor: Z
    flags: (0x0018) ACC_STATIC, ACC_FINAL

  static final java.lang.String HOST;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL

  static final int PORT;
    descriptor: I
    flags: (0x0018) ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 41
            ldc "ssl"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            ifnull 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic io.netty.example.memcache.binary.MemcacheClient.SSL:Z
         3: .line 42
            ldc "host"
            ldc "127.0.0.1"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            putstatic io.netty.example.memcache.binary.MemcacheClient.HOST:Ljava/lang/String;
         4: .line 43
            ldc "port"
            ldc "11211"
            invokestatic java.lang.System.getProperty:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            invokestatic java.lang.Integer.parseInt:(Ljava/lang/String;)I
            putstatic io.netty.example.memcache.binary.MemcacheClient.PORT:I
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.example.memcache.binary.MemcacheClient this
         0: .line 39
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.example.memcache.binary.MemcacheClient this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/example/memcache/binary/MemcacheClient;

  public static void main(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=9, args_size=1
        start local 0 // java.lang.String[] args
         0: .line 48
            getstatic io.netty.example.memcache.binary.MemcacheClient.SSL:Z
            ifeq 5
         1: .line 49
            invokestatic io.netty.handler.ssl.SslContextBuilder.forClient:()Lio/netty/handler/ssl/SslContextBuilder;
         2: .line 50
            getstatic io.netty.handler.ssl.util.InsecureTrustManagerFactory.INSTANCE:Ljavax/net/ssl/TrustManagerFactory;
            invokevirtual io.netty.handler.ssl.SslContextBuilder.trustManager:(Ljavax/net/ssl/TrustManagerFactory;)Lio/netty/handler/ssl/SslContextBuilder;
            invokevirtual io.netty.handler.ssl.SslContextBuilder.build:()Lio/netty/handler/ssl/SslContext;
         3: .line 49
            astore 1 /* sslCtx */
        start local 1 // io.netty.handler.ssl.SslContext sslCtx
         4: .line 51
            goto 6
        end local 1 // io.netty.handler.ssl.SslContext sslCtx
         5: .line 52
      StackMap locals:
      StackMap stack:
            aconst_null
            astore 1 /* sslCtx */
        start local 1 // io.netty.handler.ssl.SslContext sslCtx
         6: .line 55
      StackMap locals: io.netty.handler.ssl.SslContext
      StackMap stack:
            new io.netty.channel.nio.NioEventLoopGroup
            dup
            invokespecial io.netty.channel.nio.NioEventLoopGroup.<init>:()V
            astore 2 /* group */
        start local 2 // io.netty.channel.EventLoopGroup group
         7: .line 57
            new io.netty.bootstrap.Bootstrap
            dup
            invokespecial io.netty.bootstrap.Bootstrap.<init>:()V
            astore 3 /* b */
        start local 3 // io.netty.bootstrap.Bootstrap b
         8: .line 58
            aload 3 /* b */
            aload 2 /* group */
            invokevirtual io.netty.bootstrap.Bootstrap.group:(Lio/netty/channel/EventLoopGroup;)Lio/netty/bootstrap/AbstractBootstrap;
            checkcast io.netty.bootstrap.Bootstrap
         9: .line 59
            ldc Lio/netty/channel/socket/nio/NioSocketChannel;
            invokevirtual io.netty.bootstrap.Bootstrap.channel:(Ljava/lang/Class;)Lio/netty/bootstrap/AbstractBootstrap;
            checkcast io.netty.bootstrap.Bootstrap
        10: .line 60
            new io.netty.example.memcache.binary.MemcacheClient$1
            dup
            aload 1 /* sslCtx */
            invokespecial io.netty.example.memcache.binary.MemcacheClient$1.<init>:(Lio/netty/handler/ssl/SslContext;)V
            invokevirtual io.netty.bootstrap.Bootstrap.handler:(Lio/netty/channel/ChannelHandler;)Lio/netty/bootstrap/AbstractBootstrap;
            pop
        11: .line 74
            aload 3 /* b */
            getstatic io.netty.example.memcache.binary.MemcacheClient.HOST:Ljava/lang/String;
            getstatic io.netty.example.memcache.binary.MemcacheClient.PORT:I
            invokevirtual io.netty.bootstrap.Bootstrap.connect:(Ljava/lang/String;I)Lio/netty/channel/ChannelFuture;
            invokeinterface io.netty.channel.ChannelFuture.sync:()Lio/netty/channel/ChannelFuture;
            invokeinterface io.netty.channel.ChannelFuture.channel:()Lio/netty/channel/Channel;
            astore 4 /* ch */
        start local 4 // io.netty.channel.Channel ch
        12: .line 77
            getstatic java.lang.System.out:Ljava/io/PrintStream;
            ldc "Enter commands (quit to end)"
            invokevirtual java.io.PrintStream.println:(Ljava/lang/String;)V
        13: .line 78
            getstatic java.lang.System.out:Ljava/io/PrintStream;
            ldc "get <key>"
            invokevirtual java.io.PrintStream.println:(Ljava/lang/String;)V
        14: .line 79
            getstatic java.lang.System.out:Ljava/io/PrintStream;
            ldc "set <key> <value>"
            invokevirtual java.io.PrintStream.println:(Ljava/lang/String;)V
        15: .line 80
            aconst_null
            astore 5 /* lastWriteFuture */
        start local 5 // io.netty.channel.ChannelFuture lastWriteFuture
        16: .line 81
            new java.io.BufferedReader
            dup
            new java.io.InputStreamReader
            dup
            getstatic java.lang.System.in:Ljava/io/InputStream;
            invokespecial java.io.InputStreamReader.<init>:(Ljava/io/InputStream;)V
            invokespecial java.io.BufferedReader.<init>:(Ljava/io/Reader;)V
            astore 6 /* in */
        start local 6 // java.io.BufferedReader in
        17: .line 83
      StackMap locals: java.lang.String[] io.netty.handler.ssl.SslContext io.netty.channel.EventLoopGroup io.netty.bootstrap.Bootstrap io.netty.channel.Channel io.netty.channel.ChannelFuture java.io.BufferedReader
      StackMap stack:
            aload 6 /* in */
            invokevirtual java.io.BufferedReader.readLine:()Ljava/lang/String;
            astore 7 /* line */
        start local 7 // java.lang.String line
        18: .line 84
            aload 7 /* line */
            ifnonnull 20
        19: .line 85
            goto 25
        20: .line 87
      StackMap locals: java.lang.String
      StackMap stack:
            ldc "quit"
            aload 7 /* line */
            invokevirtual java.lang.String.toLowerCase:()Ljava/lang/String;
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 23
        21: .line 88
            aload 4 /* ch */
            invokeinterface io.netty.channel.Channel.close:()Lio/netty/channel/ChannelFuture;
            invokeinterface io.netty.channel.ChannelFuture.sync:()Lio/netty/channel/ChannelFuture;
            pop
        22: .line 89
            goto 25
        23: .line 92
      StackMap locals:
      StackMap stack:
            aload 4 /* ch */
            aload 7 /* line */
            invokeinterface io.netty.channel.Channel.writeAndFlush:(Ljava/lang/Object;)Lio/netty/channel/ChannelFuture;
            astore 5 /* lastWriteFuture */
        end local 7 // java.lang.String line
        24: .line 82
            goto 17
        25: .line 96
      StackMap locals:
      StackMap stack:
            aload 5 /* lastWriteFuture */
            ifnull 31
        26: .line 97
            aload 5 /* lastWriteFuture */
            invokeinterface io.netty.channel.ChannelFuture.sync:()Lio/netty/channel/ChannelFuture;
            pop
        end local 6 // java.io.BufferedReader in
        end local 5 // io.netty.channel.ChannelFuture lastWriteFuture
        end local 4 // io.netty.channel.Channel ch
        end local 3 // io.netty.bootstrap.Bootstrap b
        27: .line 99
            goto 31
      StackMap locals: java.lang.String[] io.netty.handler.ssl.SslContext io.netty.channel.EventLoopGroup
      StackMap stack: java.lang.Throwable
        28: astore 8
        29: .line 100
            aload 2 /* group */
            invokeinterface io.netty.channel.EventLoopGroup.shutdownGracefully:()Lio/netty/util/concurrent/Future;
            pop
        30: .line 101
            aload 8
            athrow
        31: .line 100
      StackMap locals:
      StackMap stack:
            aload 2 /* group */
            invokeinterface io.netty.channel.EventLoopGroup.shutdownGracefully:()Lio/netty/util/concurrent/Future;
            pop
        32: .line 102
            return
        end local 2 // io.netty.channel.EventLoopGroup group
        end local 1 // io.netty.handler.ssl.SslContext sslCtx
        end local 0 // java.lang.String[] args
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0   33     0             args  [Ljava/lang/String;
            4    5     1           sslCtx  Lio/netty/handler/ssl/SslContext;
            6   33     1           sslCtx  Lio/netty/handler/ssl/SslContext;
            7   33     2            group  Lio/netty/channel/EventLoopGroup;
            8   27     3                b  Lio/netty/bootstrap/Bootstrap;
           12   27     4               ch  Lio/netty/channel/Channel;
           16   27     5  lastWriteFuture  Lio/netty/channel/ChannelFuture;
           17   27     6               in  Ljava/io/BufferedReader;
           18   24     7             line  Ljava/lang/String;
      Exception table:
        from    to  target  type
           7    28      28  any
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      args  
}
SourceFile: "MemcacheClient.java"
NestMembers:
  io.netty.example.memcache.binary.MemcacheClient$1
InnerClasses:
  io.netty.example.memcache.binary.MemcacheClient$1