src/java.base/share/classes/java/io/IOException.java

@@ -35,10 +35,11 @@
  * @see     java.io.OutputStream
  * @since   1.0
  */
 public
 class IOException extends Exception {
+    @java.io.Serial
     static final long serialVersionUID = 7818375828146090155L;
 
     /**
      * Constructs an {@code IOException} with {@code null}
      * as its error detail message.