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) 
class io.netty.channel.pool.SimpleChannelPool$5 implements java.lang.Runnable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.netty.channel.pool.SimpleChannelPool$5
  super_class: java.lang.Object
{
  final io.netty.channel.pool.SimpleChannelPool this$0;
    descriptor: Lio/netty/channel/pool/SimpleChannelPool;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final io.netty.channel.Channel val$channel;
    descriptor: Lio/netty/channel/Channel;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final io.netty.util.concurrent.Promise val$promise;
    descriptor: Lio/netty/util/concurrent/Promise;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(io.netty.channel.pool.SimpleChannelPool, io.netty.channel.Channel, io.netty.util.concurrent.Promise);
    descriptor: (Lio/netty/channel/pool/SimpleChannelPool;Lio/netty/channel/Channel;Lio/netty/util/concurrent/Promise;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // io.netty.channel.pool.SimpleChannelPool$5 this
         0: .line 283
            aload 0 /* this */
            aload 1
            putfield io.netty.channel.pool.SimpleChannelPool$5.this$0:Lio/netty/channel/pool/SimpleChannelPool;
            aload 0 /* this */
            aload 2
            putfield io.netty.channel.pool.SimpleChannelPool$5.val$channel:Lio/netty/channel/Channel;
            aload 0 /* this */
            aload 3
            putfield io.netty.channel.pool.SimpleChannelPool$5.val$promise:Lio/netty/util/concurrent/Promise;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.channel.pool.SimpleChannelPool$5 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/channel/pool/SimpleChannelPool$5;
    MethodParameters:
             Name  Flags
      this$0       final
      val$channel  final
      val$promise  final

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // io.netty.channel.pool.SimpleChannelPool$5 this
         0: .line 286
            aload 0 /* this */
            getfield io.netty.channel.pool.SimpleChannelPool$5.this$0:Lio/netty/channel/pool/SimpleChannelPool;
            aload 0 /* this */
            getfield io.netty.channel.pool.SimpleChannelPool$5.val$channel:Lio/netty/channel/Channel;
            aload 0 /* this */
            getfield io.netty.channel.pool.SimpleChannelPool$5.val$promise:Lio/netty/util/concurrent/Promise;
            invokevirtual io.netty.channel.pool.SimpleChannelPool.doReleaseChannel:(Lio/netty/channel/Channel;Lio/netty/util/concurrent/Promise;)V
         1: .line 287
            return
        end local 0 // io.netty.channel.pool.SimpleChannelPool$5 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/channel/pool/SimpleChannelPool$5;
}
SourceFile: "SimpleChannelPool.java"
EnclosingMethod: io.netty.channel.pool.SimpleChannelPool.release:(Lio/netty/channel/Channel;Lio/netty/util/concurrent/Promise;)Lio/netty/util/concurrent/Future;
NestHost: io.netty.channel.pool.SimpleChannelPool
InnerClasses:
  io.netty.channel.pool.SimpleChannelPool$5