http://www.jboss.org/undertow-parent/undertow-core: Undertow (JBoss by Red Hat) 
public interface io.undertow.server.ExchangeCompletionListener$NextListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.undertow.server.ExchangeCompletionListener$NextListener
  super_class: java.lang.Object
{
  public abstract void proceed();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "ExchangeCompletionListener.java"
NestHost: io.undertow.server.ExchangeCompletionListener
InnerClasses:
  public abstract NextListener = io.undertow.server.ExchangeCompletionListener$NextListener of io.undertow.server.ExchangeCompletionListener