https://projects.eclipse.org/projects/ee4j.grizzly/grizzly-websockets-server: Grizzly Bill of Materials (BOM) (Oracle Corporation) 
public interface org.glassfish.grizzly.servlet.ExpectationHandler$AckAction
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.glassfish.grizzly.servlet.ExpectationHandler$AckAction
  super_class: java.lang.Object
{
  public abstract void acknowledge();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException

  public abstract void fail();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
}
SourceFile: "ExpectationHandler.java"
NestHost: org.glassfish.grizzly.servlet.ExpectationHandler
InnerClasses:
  public abstract AckAction = org.glassfish.grizzly.servlet.ExpectationHandler$AckAction of org.glassfish.grizzly.servlet.ExpectationHandler