--- old/src/java.base/share/classes/com/sun/java/util/jar/pack/ClassReader.java	2019-08-27 17:26:45.930324386 -0700
+++ new/src/java.base/share/classes/com/sun/java/util/jar/pack/ClassReader.java	2019-08-27 17:26:45.750324386 -0700
@@ -605,6 +605,7 @@
     }
 
     static class ClassFormatException extends IOException {
+        @java.io.Serial
         private static final long serialVersionUID = -3564121733989501833L;
 
         public ClassFormatException(String message) {