LJC - London Java Community

Java PackedObjects Hackday

Aug 17, 2013 · 10:00 AM
IBM Southbank (SE1 9PZ)

PackedObjects Hackday

At IBM we're pretty excited about a prototype capability we've added to our J9 JVM called PackedObjects. You can read more about from some of the links at the end.

In a nutshell it designed to allow better control over the layout and form of fields within a Object. Why is this exciting? well there are bunch of reasons but I'll give you just one that may appeal: better, faster, easier inter-op with native code. Would you like to be able to really share data with native applications? No copying, no special, archane APIs. Just Java classes on one side, C style structures on the other and a lot less JNI. We think this enhancement to Java is pretty cool of course but we'd like to get your views

Even if you don't directly work with JNI the platform level benefits are potentially enormous. Faster interoperability with any native code means faster networking performance, faster I/O and faster graphics rendering. Ever tried to write a 3D game in Java and been bottlenecked by OpenGL interoperability? PackedObjects can eliminate the performance pain point.

Whenever a new programming challenge appears there is almost always a call to add tailored support into the Java language. Almost always that's a bad idea.

Language changes are forever and as such need careful thought and wide debate. Unfortunately discussions about language enhancements frequently end up focusing on syntax over substance.

How do you focus the debate on the underlying substance? How do you identify the fundamental concepts that benefit enough Java users that a language change is justified? How about a hands-on, warts-and-all-prototype hackday?

We'll cover the challenges that inspired the PackedObject design and examine some of the related alternatives proposed by the community - such as ValueTypes , C# style structs etc. We'll help you hack with our current prototype implementation and you'll help us and the OpenJDK community progress towards a common solution.

If you're interested in the process of evolving programming language design, want to see how to make your native interop faster or just want to understand more about PackedObjects this day is for you.

If you want to get your hands on the prototype right now you can - its shipped with the IBM Java 8 beta. (Linux IA-32 only unless you have a mainframe at home)

http://www.ibm.com/developerworks/java/jdk/beta/

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Richard W.

Event Host
Martijn V.

Diabolical Developer, Co-Organizer
Thilak Kumar M.
Ioannis M.
Prasannaa
Alex M.
Dennis H.
Michael W.
Andrzej G.
John
Carl Matthew J.
Miguel G.
Ben E.

Assistant Organizer
Colibri
Dinuk W.
Eswar
F M
Darach E.
Mani
Fox R.
Norbert R.
Salman K.
Alexandrian N.
Daniel B.
Jaromir H.
Prashant M.
Antonio Jose Molina G.
Martin T.
Ian
Yana A.
Donald B.
Wojciech Ł.
Shanmuhanathan T.
A former member
A former member
A former member

LJC - London Java Community

London, United Kingdom

Founded Nov 26, 2007

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The London Java Community (LJC) is a group of Java Enthusiasts who are interested in benefiting from shared knowledge in the industry. Through our forum and regular meetings you can keep in touch with the latest industry developments, learn new Java (& other JVM) technologies, meet other developers, discuss technical/non technical issues and network further throughout the Java Community.

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What is the LJC?

The LJC is an official Java User Group for developers based in London. It was founded in November 2007 and since then has grown to over 5000 members and is now the biggest Java User Group in the UK.

What goes on in the LJC?

We run a variety of regular events ranging from social events and technical presentations to our full day unconference. On top of the events we run prize draws and have an active mailing list/forum. We support the Graduate Development Community in London and promote London based Open Source Software projects where possible.

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Just click on the link on this page to sign up to the mailing list, you'll hear of all of our latest news and events and can take part in the monthly prize draws.

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Founder of London Java Community

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