--- a/src/java.base/share/classes/java/util/concurrent/ConcurrentSkipListMap.java	Thu Oct 17 07:31:35 2019 +0800
+++ b/src/java.base/share/classes/java/util/concurrent/ConcurrentSkipListMap.java	Wed Oct 16 16:55:52 2019 -0700
@@ -334,6 +334,7 @@
      * nested classes.)
      * @serial
      */
+    @SuppressWarnings("serial") // Conditionally serializable
     final Comparator<? super K> comparator;
 
     /** Lazily initialized topmost index of the skiplist. */
@@ -2375,8 +2376,10 @@
         /** Underlying map */
         final ConcurrentSkipListMap<K,V> m;
         /** lower bound key, or null if from start */
+        @SuppressWarnings("serial") // Conditionally serializable
         private final K lo;
         /** upper bound key, or null if to end */
+        @SuppressWarnings("serial") // Conditionally serializable
         private final K hi;
         /** inclusion flag for lo */
         private final boolean loInclusive;