Hello,
Following up from the recent discussions around
JDK-8035452: Fix serial lint warnings in core libs
it turns out that java.util.TreeMap.NavigableSubMap, a package private
nested class used in the TreeMap implementation does indeed need to have
a serialVersionUID defined to allow for easy cross-release serialization.
An API change made to TreeMap during JDK 8 changed the serialver hash of
the class. This patch
--- a/src/share/classes/java/util/TreeMap.java Mon Mar 03 18:17:00
2014 +0400
+++ b/src/share/classes/java/util/TreeMap.java Tue Mar 04 17:41:09
2014 -0800
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights
reserved.
+ * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights
reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@@ -1335,6 +1335,7 @@
*/
abstract static class NavigableSubMap<K,V> extends AbstractMap<K,V>
implements NavigableMap<K,V>, java.io.Serializable {
+ private static final long serialVersionUID = -2102997345730753016L;
/**
* The backing map.
*/
restores the serial hash value present in JDK 6 and 7.
This particular review request is for JDK 9; we are evaluating options
on how best to fix this issue in the JDK 8 train.
Thanks,
-Joe
