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Sounds significant, but how important is Apple/MacOS to Java?

Not really as significant as one might think. This is just Apple saying, "we're discontinuing our own, internally developed and maintained JRE/JDK." I don't know off-hand how far this diverges from Sun/Oracle Java or IBM Java though (maybe someone else can step up with that information).

I didn't see anything saying that they would never distribute any JRE on Mac OS X though. They may just find someone else's JRE to distribute.

If they help to maintain and distribute an alternative JRE (which could only really be OpenJDK, one would think) then it's good news for Java developers. On the other hand, if they don't distribute any and don't help to maintain it then it's a disaster. If the latter turns out to be true then I'd be pretty concerned if I was a Java developer (or if I used any of the JVM based languages).

Not very significant as a target platform, I would think, but OS X is certainly a favorite development OS for many Java developers. Sun, for example, had been issuing MacBooks Pro to its engineers during its last few years.

It's unclear whether this is positive or a negative announcement. If another party steps up to maintain a JDK/JRE port on OS X, this will probably end up being a good thing, as Java updates from Apple had been infrequent.

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