src/java.base/share/classes/java/util/concurrent/PriorityBlockingQueue.java

@@ -171,10 +171,11 @@
     private final ReentrantLock lock = new ReentrantLock();
 
     /**
      * Condition for blocking when empty.
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private final Condition notEmpty = lock.newCondition();
 
     /**
      * Spinlock for allocation, acquired via CAS.
      */