--- old/src/java.base/share/classes/java/net/Authenticator.java	2020-07-23 17:23:14.407597194 -0700
+++ new/src/java.base/share/classes/java/net/Authenticator.java	2020-07-23 17:23:14.015597194 -0700
@@ -75,6 +75,11 @@
     private final String key = AuthenticatorKeys.computeKey(this);
 
     /**
+     * Constructor for subclasses to call.
+     */
+    public Authenticator() {}
+
+    /**
      * The type of the entity requesting authentication.
      *
      * @since 1.5