Nothing you'll miss in those contexts. Most of what is closed source is code that 3rd parties wrote and Sun couldn't open source (code java.awt relies on mostly.)
For the actual JVM I don't think there is anything big missing, except maybe some support for SPARC. The big question will be what happens in the future when they start merging JRockit with Hotspot. JRockit has quite a few extensions for monitoring that I think Oracle will keep closed (and expensive.)
For the actual JVM I don't think there is anything big missing, except maybe some support for SPARC. The big question will be what happens in the future when they start merging JRockit with Hotspot. JRockit has quite a few extensions for monitoring that I think Oracle will keep closed (and expensive.)