--- old/src/java.base/share/classes/java/util/IllegalFormatConversionException.java	2019-08-27 17:28:59.982324386 -0700
+++ new/src/java.base/share/classes/java/util/IllegalFormatConversionException.java	2019-08-27 17:28:59.790324386 -0700
@@ -37,6 +37,7 @@
  */
 public class IllegalFormatConversionException extends IllegalFormatException {
 
+    @java.io.Serial
     private static final long serialVersionUID = 17000126L;
 
     private char c;