diff -r 7322c48a84cf -r 6252605fb005 src/java.base/share/classes/java/util/concurrent/PriorityBlockingQueue.java
--- a/src/java.base/share/classes/java/util/concurrent/PriorityBlockingQueue.java	Thu Oct 17 07:31:35 2019 +0800
+++ b/src/java.base/share/classes/java/util/concurrent/PriorityBlockingQueue.java	Wed Oct 16 16:55:52 2019 -0700
@@ -173,6 +173,7 @@
     /**
      * Condition for blocking when empty.
      */
+    @SuppressWarnings("serial") // Classes implementing Condition may be serializable.
     private final Condition notEmpty = lock.newCondition();
 
     /**