Why a new 1.5 JRE?

Just a little something to argue about...
Why does Java 1.5 need an entirely new JRE? The bytecode specification hasn't changed as far as I'm aware. 3 possible reasons could be
1. New native code for things like NIO
2. New types of garbage collection schemes... Don't know. Has this changed?
3. Updates + bug fixes to previously released classes
Isn't there some better way that this update could be done without having to download the entire thing all over again? You know, like projects that have a source code repository accessible over the internet?

The JRE is the JVM plus all the thousands of classes
in the Java API, isn't it? No change in the bytecode
spec might imply no change in the JVM but that's all.Very true.
I don't really know that I'm arguing for these things, just trying to spark a little conversation about
1. Separation between jvm & libraries
2. 'Smart' version upgrades where only the changed classes need to be downloaded
However, now that I'm thinking about it some more, I think it is definitely a good idea that java maintain the idea of platform versions, so that people don't start trying to mix old and new versions of Java classes, as that strikes me as inherently unstable. Plus it could seriously complicate object serialization.
Interesting

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