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

@@ -79,10 +79,15 @@
             theProxySelector = null;
         }
     }
 
     /**
+     * Constructor for subclasses to call.
+     */
+    public ProxySelector() {}
+
+    /**
      * Gets the system-wide proxy selector.
      *
      * @throws  SecurityException
      *          If a security manager has been installed and it denies
      *          {@link NetPermission}{@code ("getProxySelector")}