--- old/src/java.base/share/classes/java/util/regex/PatternSyntaxException.java	2019-08-27 17:29:18.934324386 -0700
+++ new/src/java.base/share/classes/java/util/regex/PatternSyntaxException.java	2019-08-27 17:29:18.762324386 -0700
@@ -37,6 +37,7 @@
 public class PatternSyntaxException
     extends IllegalArgumentException
 {
+    @java.io.Serial
     private static final long serialVersionUID = -3864639126226059218L;
 
     private final String desc;