src/java.base/share/classes/java/net/Authenticator.java

*** 73,82 ****
--- 73,87 ----
      private URL requestingURL;
      private RequestorType requestingAuthType;
      private final String key = AuthenticatorKeys.computeKey(this);
  
      /**
+      * Constructor for subclasses to call.
+      */
+     public Authenticator() {}
+ 
+     /**
       * The type of the entity requesting authentication.
       *
       * @since 1.5
       */
      public enum RequestorType {