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I voted improved multimedia support, but close seconds for me (from this list) are closures, resolution-independent Swing, and USB support. Personally, I like the not-null support thing and better properties, too. But I'd them after my above list.
I'd also like to see HotSpot support immediate Integer objects (or more clever since the JVM is strongly typed) for higher-performance support of purely object-oriented languages. To give more detail, this is the trick where you know (for some CPUs) that all pointers are on 4-byte boundaries, so you cheat with the extra bits as flags to store immediate values and pretend they were pointers.
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