https://javaee.github.io/servlet-spec/: Java.net - The Source for Java Technology Collaboration (GlassFish Community) 
public interface javax.servlet.FilterRegistration$Dynamic extends javax.servlet.FilterRegistration, javax.servlet.Registration$Dynamic
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.servlet.FilterRegistration$Dynamic
  super_class: java.lang.Object
{
}
SourceFile: "FilterRegistration.java"
NestHost: javax.servlet.FilterRegistration
InnerClasses:
  public abstract Dynamic = javax.servlet.FilterRegistration$Dynamic of javax.servlet.FilterRegistration
  public abstract Dynamic = javax.servlet.Registration$Dynamic of javax.servlet.Registration