src/java.base/share/classes/java/util/concurrent/atomic/LongAccumulator.java

@@ -80,10 +80,11 @@
  * @author Doug Lea
  */
 public class LongAccumulator extends Striped64 implements Serializable {
     private static final long serialVersionUID = 7249069246863182397L;
 
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private final LongBinaryOperator function;
     private final long identity;
 
     /**
      * Creates a new instance using the given accumulator function

@@ -237,10 +238,11 @@
 
         /**
          * The function used for updates.
          * @serial
          */
+        @SuppressWarnings("serial") // Not statically typed as Serializable
         private final LongBinaryOperator function;
 
         /**
          * The identity value.
          * @serial