https://spring.io/projects/spring-boot: Spring Boot (Pivotal Software, Inc.) 
public interface org.springframework.boot.web.server.ErrorPageRegistrar
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.springframework.boot.web.server.ErrorPageRegistrar
  super_class: java.lang.Object
{
  public abstract void registerErrorPages(org.springframework.boot.web.server.ErrorPageRegistry);
    descriptor: (Lorg/springframework/boot/web/server/ErrorPageRegistry;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
          Name  Flags
      registry  
}
SourceFile: "ErrorPageRegistrar.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()