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.resolver.dns.DnsNameResolver$1 extends io.netty.util.concurrent.FastThreadLocal<io.netty.resolver.dns.DnsServerAddressStream>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.netty.resolver.dns.DnsNameResolver$1
  super_class: io.netty.util.concurrent.FastThreadLocal
{
  final io.netty.resolver.dns.DnsNameResolver this$0;
    descriptor: Lio/netty/resolver/dns/DnsNameResolver;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(io.netty.resolver.dns.DnsNameResolver);
    descriptor: (Lio/netty/resolver/dns/DnsNameResolver;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.resolver.dns.DnsNameResolver$1 this
         0: .line 168
            aload 0 /* this */
            aload 1
            putfield io.netty.resolver.dns.DnsNameResolver$1.this$0:Lio/netty/resolver/dns/DnsNameResolver;
            aload 0 /* this */
            invokespecial io.netty.util.concurrent.FastThreadLocal.<init>:()V
            return
        end local 0 // io.netty.resolver.dns.DnsNameResolver$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/resolver/dns/DnsNameResolver$1;
    MethodParameters:
        Name  Flags
      this$0  final

  protected io.netty.resolver.dns.DnsServerAddressStream initialValue();
    descriptor: ()Lio/netty/resolver/dns/DnsServerAddressStream;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.resolver.dns.DnsNameResolver$1 this
         0: .line 171
            aload 0 /* this */
            getfield io.netty.resolver.dns.DnsNameResolver$1.this$0:Lio/netty/resolver/dns/DnsNameResolver;
            getfield io.netty.resolver.dns.DnsNameResolver.dnsServerAddressStreamProvider:Lio/netty/resolver/dns/DnsServerAddressStreamProvider;
            ldc ""
            invokeinterface io.netty.resolver.dns.DnsServerAddressStreamProvider.nameServerAddressStream:(Ljava/lang/String;)Lio/netty/resolver/dns/DnsServerAddressStream;
            areturn
        end local 0 // io.netty.resolver.dns.DnsNameResolver$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/resolver/dns/DnsNameResolver$1;
    Exceptions:
      throws java.lang.Exception

  protected java.lang.Object initialValue();
    descriptor: ()Ljava/lang/Object;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual io.netty.resolver.dns.DnsNameResolver$1.initialValue:()Lio/netty/resolver/dns/DnsServerAddressStream;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws java.lang.Exception
}
Signature: Lio/netty/util/concurrent/FastThreadLocal<Lio/netty/resolver/dns/DnsServerAddressStream;>;
SourceFile: "DnsNameResolver.java"
EnclosingMethod: io.netty.resolver.dns.DnsNameResolver
NestHost: io.netty.resolver.dns.DnsNameResolver
InnerClasses:
  io.netty.resolver.dns.DnsNameResolver$1