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.nio.NioEventLoop$6 implements java.lang.Runnable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.netty.channel.nio.NioEventLoop$6
  super_class: java.lang.Object
{
  final io.netty.channel.nio.NioEventLoop this$0;
    descriptor: Lio/netty/channel/nio/NioEventLoop;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(io.netty.channel.nio.NioEventLoop);
    descriptor: (Lio/netty/channel/nio/NioEventLoop;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.channel.nio.NioEventLoop$6 this
         0: .line 332
            aload 0 /* this */
            aload 1
            putfield io.netty.channel.nio.NioEventLoop$6.this$0:Lio/netty/channel/nio/NioEventLoop;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.channel.nio.NioEventLoop$6 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/channel/nio/NioEventLoop$6;
    MethodParameters:
        Name  Flags
      this$0  final

  public void run();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.channel.nio.NioEventLoop$6 this
         0: .line 335
            aload 0 /* this */
            getfield io.netty.channel.nio.NioEventLoop$6.this$0:Lio/netty/channel/nio/NioEventLoop;
            invokevirtual io.netty.channel.nio.NioEventLoop.rebuildSelector0:()V
         1: .line 336
            return
        end local 0 // io.netty.channel.nio.NioEventLoop$6 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/channel/nio/NioEventLoop$6;
}
SourceFile: "NioEventLoop.java"
EnclosingMethod: io.netty.channel.nio.NioEventLoop.rebuildSelector:()V
NestHost: io.netty.channel.nio.NioEventLoop
InnerClasses:
  io.netty.channel.nio.NioEventLoop$6