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.handler.timeout.WriteTimeoutException extends io.netty.handler.timeout.TimeoutException
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.timeout.WriteTimeoutException
  super_class: io.netty.handler.timeout.TimeoutException
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: -144786655770296065

  public static final io.netty.handler.timeout.WriteTimeoutException INSTANCE;
    descriptor: Lio/netty/handler/timeout/WriteTimeoutException;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 26
            new io.netty.handler.timeout.WriteTimeoutException
            dup
            invokespecial io.netty.handler.timeout.WriteTimeoutException.<init>:()V
            putstatic io.netty.handler.timeout.WriteTimeoutException.INSTANCE:Lio/netty/handler/timeout/WriteTimeoutException;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.timeout.WriteTimeoutException this
         0: .line 28
            aload 0 /* this */
            invokespecial io.netty.handler.timeout.TimeoutException.<init>:()V
            return
        end local 0 // io.netty.handler.timeout.WriteTimeoutException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/timeout/WriteTimeoutException;
}
SourceFile: "WriteTimeoutException.java"