Serialized versioning between JRE releases?

I am planning to serialize some core Java language objects to disk (String, Polygon, Rectangle, others). If I do this, can I guarantee that those objects can be de-serialized by newer versions of the JRE? In other words... if a user serializes several objects using JRE 1.3.1, and another user trys to de-serialize the objects using JRE 1.4.1, 1.4.2, or 1.5, will it work?
Another way to ask the question is: Does Sun "do something" to guarantee no compatibility issues between serialized objects in different releases?
Thanks!

I am planning to serialize some core Java language
objects to disk (String, Polygon, Rectangle, others).
If I do this, can I guarantee that those objects can
n be de-serialized by newer versions of the JRE? In
other words... if a user serializes several objects
using JRE 1.3.1, and another user trys to
de-serialize the objects using JRE 1.4.1, 1.4.2, or
1.5, will it work?
Another way to ask the question is: Does Sun "do
something" to guarantee no compatibility issues
between serialized objects in different releases?
The new versions backwards compatibly. so there will be no problem of compatibility.
You can take a look at this :
http://java.sun.com/j2se/1.5.0/compatibility.html
Thanks!

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