On Wed, Nov 17, 2010 at 9:57 AM, Reinier Zwitserloot <[email protected]>wrote:
> Mark *just* finished talking, so, hot off the presses, my notes from
> his keynote presentation at Devoxx 2010:
>
Thanks for the detailed report!
> # Mark Reinhold at Devoxx '10.
>
> Start off with a review of java versions, apologies and introspective
> on the clusterfail that was the java 7 schedule - you've heard this
> before: The setting of Sun broke all planning, and the conclusion is
> for 7 to be a less ambitious release without closures, and then work
> on getting Java8 out the door as fast as possible after that (the Plan
> B stuff we've read about before).
>
> ## Productivity:
>
> ### Java7: Diamond Operator: Map<String, String> map = new
> HashMap<String, String>(); can now become:
> Map<String, String> map = new HashMap<>();
>
> [Editor's note: Lombok will one-up this feature on Friday!]
>
> ### Java7: Automatic Resource Management blocks. You can write:
> try (InputStream in = new FileInputStream(src)) {
> // read from in
> }
>
> [Editor's note: Lombok has let you do this for over a year now via
> @Cleanup].
>
> ### Java7: Mention of Project Coin and its features.
>
> ## Performance:
>
> Clock rates have topped out, instead CPU speed now comes in the form
> of more cores.
>
> sequential iterator (for loops) on big lists aren't compatible with
> massively multicore CPUs.
> Functional style iteration (map / filter / zip / etc) are. Review of
> what these do.
> Lambdas are showcased as a solution, then Defender methods to add map,
> filter, etc to the collections APIs: http://twitpic.com/37kxub
>
>
> ### long-term plans for java:
>
> Now Mark talks about Reification. Explains what it is and why it would
> be nice.
>
> Mark then talks about primitives in generics: http://twitpic.com/37ky8w
>
> And somebody's been learning from Project Lombok: Simple POJOs in
> Java: http://twitpic.com/37kyk9
>
> ### Talking about DaVinci (Jython on the JVM is often faster than C-
> Python, but we can do better with features like InvokeDynamic). No
> news I haven't heard before.
>
> ### Talking about what Project Jigsaw is about. No changes to what
> module-info.java looks like: http://twitpic.com/37kz6a . Main goal of
> Project Jigsaw is to get rid of '-classpath'.
>
> Also a mention of how the jar file format is hampering modularization
> efforts, so it'll be replaced with jmod, which is a custom format
> specifically designed for java modules. Can be converted to rpms/debs,
> jars to work with older java versions, etc.
>
> [Editor's note: This is the first time I remember jigsaw vs. Maven
> talk, usually it's jigsaw v. OSGi]. Mark talks about unifying compile-
> time module systems like Maven and runtime module systems like OSGi;
> they're going to look into making jigsaw do both of those things.
>
> Showcasing the jmod tool which lets you create, edit, and work with
> jmod modules.
>
> Promises looking into a CPAN-like 'remote repository' feature for
> jmod, which would look something like this: http://twitpic.com/37l0pg
>
Vewwwy intewesting. This raises a tonne of questions. Who maintains and
curates the repository? Will it be multi-repo (looks like it). Does it
cover source code and javadocs? (essential for IDEs).
My concern is that we'll end up with a tonne of poor quality dependencies
unless somebody pays attention from the beginning. The maven central repo
is starting to get cleaned up, thankfully, and it would be nice if the same
mistakes weren't repeated.
> ## JVM Convergence
>
> Not particularly specific talk about 'HotRocket' - the idea of
> integrating JRockit VM and the Hotspot VM.
>
> Showcasing Mission Control and Flight Recorder, the VM introspection
> tools of JRockit. No mention of the 'premium VM' news that was in the
> news a week or two ago. Mark never specifically said Mission Control
> or Flight Recorder are going to be in OpenJDK or the free Oracle JVM.
>
> ## Java Plan B:
>
> Java 7 released Mid2011, then the features planned for Java 7 that
> aren't close to done yet, moved out to Java 8, to be released Late
> 2012. Mark says he's "pretty confident" about these dates:
> http://twitpic.com/37l22c
>
> Mark shows the Umbrella JSRs for Java7 and Java8 having been submitted
> to the JCP earlier today.
>
> OpenJDK will remain GPL+Classpath Exception. IBM and Apple are going
> to contribute to OpenJDK. The OpenJDK governance structure will be
> rebooted. Mark expects a MacOS implementation of Java7 available
> within a few months of general availability of the Linux and Windows
> implementations.
>
> Release schedule of Java7. Mark again states he's "pretty confident":
> http://twitpic.com/37l3fe
>
> NB: I'll clean this up and post it to my blog later.
>
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-Dom
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