- java-devroom - lists.fosdem.org

Dev Room Proposal: "cache2k, Java caching turbo charged"
by Jens Wilke 04 Feb '15

04 Feb '15

Title: cache2k, Java caching turbo charged Abstract: The development of cache2k has two streams: It is a robust cache implementation and provides features we miss from other products, on the other hand it is a research area to try out new caching algorithms and implementations to achieve the best performing in-memory Java cache that is available today. The talk will start with some real-world scenarios and challenges and how the cache can help, making it the pivotal point in an application to manage data resources and provide them on time. The second part of the talk will be about modern and adaptive caching algorithms and why you should not implement yet another "LRU cache" by yourself. This talk should encourage to use more caching to speed up applications and, of course, to hack and improve existing caching products. There is still much to achieve! Recording me on audio and/or video: acceptable under a CC-BY-2.0 license Speaker Bio: Jens Wilke is a coding veteran and part-time entrepreneur in a boutique software engineering company in Munich. In ancient times jens worked on many different projects, from embedded systems up to software for the IBM mainframe, in startups and in "legacy" companies. He is enthusiastic about improving performance, within developer teams as well as in complex software systems. Links: http://cache2k.org http://cruftex.net Cheers, Jens -- "Everything superfluous is wrong!" // Jens Wilke - headissue GmbH - Germany \// http://www.headissue.com

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DevRoom Proposal: Sustaining the zero assembler port in OpenJDK: An inside perspective of CPU specific issues.
by Severin Gehwolf 03 Feb '15

03 Feb '15

* Title Sustaining the zero assembler port in OpenJDK: An inside perspective of CPU specific issues. * Abstract OpenJDK comes with a zero assembler port called Zero. Back in 2009 when Zero was originally developed by Gary Benson, OpenJDK was available only on x86, x86_64 and SPARK. Despite recent JIT ports, such as the AArch64 and ppc/aix port, Zero still remains relevant for many Linux distributions. For example, at Red Hat we build and use the OpenJDK zero variant on PPC/PPC64 and s390/s390x. What's more it's a useful tool for getting new JIT ports built from source using free software. This talk will give a brief summary what Zero is and how it works. It will cover some of the recently discovered issues with sustaining the Zero port, how we try to catch them early and it will explain our experience with pushing fixes upstream. There will also be examples how this effort benefits the OpenJDK ecosystem as a whole. * Recording me on audio and/or video Yes * Speakers Severin Gehwolf, Red Hat, Inc. Severin Gehwolf a is a Software Engineer at Red Hat. Currently he is a member of the OpenJDK team primarily working on OpenJDK tooling and the zero assembler hotspot port. Photo link: http://www.gravatar.com/avatar/031db269afe97065baead22ce42e71bd Blog: https://jerboaa.wordpress.com/

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DevRoom Proposal: Packed Objects, Object Layout & Value Types - a Survey
by Volker Simonis 02 Feb '15

02 Feb '15

Title: Packed Objects, Object Layout & Value Types - a Survey Abstract: Java is often criticized for its lack of supporting C-style structs. This makes it hard to efficiently implement certain type of data structures (like for example arrays of small objects) in Java. However, recently there have been several different approaches which try to address this problem. My talk will briefly introduce "Packed Objects" [1], an extension available in IBM's Java SDK 8, "Object Layout" [2], a layout-optimized Java data structure package proposed by Azul Systems and Value Types [3][4], an OpenJDK proposal for immutable, reference-free value objects. I will describe the commonalities and differences of the three approaches and explain how they can improve the memory overhead and locality of Java objects. [1] http://www.oracle.com/technetwork/java/jvmls2013sciam-2013525.pdf [2] http://objectlayout.org/ [3] http://openjdk.java.net/jeps/169 [4] http://cr.openjdk.java.net/~jrose/values/values-0.html Bio: Volker Simonis works for SAP in the SAP JVM Technology group. He is an OpenJDK contributor from the very beginning and helped SAP and the SAP JVM team engage in the OpenJDK project. He's the project lead of the OpenJDK PowerPC/AIX porting project, a JDK8 committer and JDK9 reviewer. Recording me on audio and/or video is acceptable I'd like to get a 45min slot if possible. Thank you and best regards, Volker

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DevRoom Proposal: Open Heart Surgery: HotSpot Debugging at the OS Level
by Volker Simonis 02 Feb '15

02 Feb '15

Title: Open Heart Surgery: HotSpot Debugging at the OS Level Abstract: Debugging Java applications is comfortable and simple, but if you want to look beyond the Java horizon, you need special knowledge and and different tools. This interactive session shows you how to debug a running VM or analyze a VM core file with a native debugger like gdb. You will also learn how to use some of the more than 1,200 VM options to trace or modify the VM behavior. This knowledge can greatly help you identify, isolate and reproduce the root cause of hard VM crashes, and it can also be pure fun to see which actual machine instruction the CPU is executing for your Java code. Bio: Volker Simonis works for SAP in the SAP JVM Technology group. He is an OpenJDK contributor from the very beginning and helped SAP and the SAP JVM team engage in the OpenJDK project. He's the project lead of the OpenJDK PowerPC/AIX porting project, a JDK8 committer and JDK9 reviewer. Recording me on audio and/or video is acceptable This session requires a 45min slot. Thank you and best regards, Volker

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Re: VMFlexArray in OpenJDK
by Christopher Friedt 02 Feb '15

02 Feb '15

Hi I don't have Martin's contact info. I'm not sure if I've spelled his name correctly! He said that I should speak to him about possibly adding some of my change proposals for VMFlexArray to OpenJDK. Martin, if you receive the email, please email me back off-list. Thanks! © Sent from my Android

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DevRoom Proposal: Java restart with WebFX
by Nikita Lipsky 01 Feb '15

01 Feb '15

* Title Java restart with WebFX: the new web with the new web browser * Abstract The purpose of the WebFX project is to investigate the capabilities of using JavaFX to build rich web applications. Actually, it is an attempt to create a new web where HTML is replaced with FXML — the markup language for JavaFX UI, and the logic can be written in any programming language that is available on top of Java platform from JavaScript, Groovy, JRuby to Java, Kotlin and Scala. Java ReStart is a complimentary project that acts as transport layer for WebFX allowing FXML pages to reference arbitrary Java bytecode on a web server and hence any custom JavaFX UI components and Java third-party libraries. In addition, Java ReStart allows to run arbitrary Java applications instantly from a web server downloading only required parts of applications on demand and executing them in parallel with downloading. I would like to give an overview of the projects, make a live demo, compare the proposed technologies with traditional web and native clients, show how the technologies differ from Java applets and Java Webstart, reveal benefits in compare with RDP-like approaches. Finally, I will share my vision on how to evolve the projects. * Recording me on audio and/or video Yes * Speakers Speaker: Nikita Lipsky, Excelsior LLC. I am an initiator and a team lead of Excelsior JET project - certified Java SE implementation with AOT compiler developed by Excelsior LLC. Working on the project since 1997 I took part in almost every activity of the project from the JVM core to product management and support. Last couple of years, I am experimenting (in a spare time) with open source projects exploring approaches and a concept of the next web. Photo link: *http://www.gravatar.com/avatar/e071ddb92cfd60762d93c1a625c6d654.png <http://www.gravatar.com/avatar/e071ddb92cfd60762d93c1a625c6d654.png>* or any from here -- https://vk.com/tag38902450 like https://vk.com/photo-35491074_343279707?tag=38902450 . Twitter: @pjBooms GitHub: https://github.com/pjBooms (you may find the sources of the above projects there).

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Slides for FOSDEM 2015 What Lies Beneath
by Andrew Dinn 01 Feb '15

01 Feb '15

Attached are the slides for the presentation Roman and I gave yesterday. regards, Andrew Dinn ----------- Senior Principal Software Engineer Red Hat UK Ltd Registered in UK and Wales under Company Registration No. 3798903 Directors: Michael Cunningham (USA), Matt Parson (USA), Charlie Peters (USA), Michael O'Neill (Ireland)

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Another schedule change
by Mario Torre 28 Jan '15

28 Jan '15

Hi all, I've done another small change to the schedule. Basically the "Java 9: Make Way for Modules" and "Beyond Java 9" presentations have been swapped out, this is the new schedule: 10:30 - 10:55 Java 9: Make Way for Modules! 14:00 - 14:25 The State of OpenJDK The FOSDEM booklet has already been printed, so those changes will not be visible. They have been picked up by the online tool, though: https://fosdem.org/2015/schedule/track/java/ Cheers, Mario -- pgp key: http://subkeys.pgp.net/ PGP Key ID: 80F240CF Fingerprint: BA39 9666 94EC 8B73 27FA FC7C 4086 63E3 80F2 40CF Java Champion - Blog: http://neugens.wordpress.com - Twitter: @neugens Proud GNU Classpath developer: http://www.classpath.org/ OpenJDK: http://openjdk.java.net/projects/caciocavallo/ Please, support open standards: http://endsoftpatents.org/

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Help needed
by Mario Torre 23 Jan '15

23 Jan '15

Hi all, We need a volunteer (or better yet, a couple) for the video sessions. Most presentations have agreed to be recorded and we would like to fulfil this duty, however we need some manpower for that to happen! Any help is very appreciated! Volunteers can send me a mail in private or reply to this thread. Thanks! Cheers, Mario -- pgp key: http://subkeys.pgp.net/ PGP Key ID: 80F240CF Fingerprint: BA39 9666 94EC 8B73 27FA FC7C 4086 63E3 80F2 40CF Java Champion - Blog: http://neugens.wordpress.com - Twitter: @neugens Proud GNU Classpath developer: http://www.classpath.org/ OpenJDK: http://openjdk.java.net/projects/caciocavallo/ Please, support open standards: http://endsoftpatents.org/

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Schedule changes
by Mario Torre 23 Jan '15

23 Jan '15

Hi all, For technical reason and in accordance with the speakers, I changed slightly the schedule. The "Fortress" talk has been canceled, while I switched "Building an open Internet of Things with Java and Eclipse IoT" and "Java restart with WebFX", and this last one will get a slightly longer slot: 12:30 - 12:55 Building an open Internet of Things with Java and Eclipse IoT 17:00 - 17:55 Java restart with WebFX The full schedule is already online: https://fosdem.org/2015/schedule/track/java/ Cheers, Mario -- pgp key: http://subkeys.pgp.net/ PGP Key ID: 80F240CF Fingerprint: BA39 9666 94EC 8B73 27FA FC7C 4086 63E3 80F2 40CF Java Champion - Blog: http://neugens.wordpress.com - Twitter: @neugens Proud GNU Classpath developer: http://www.classpath.org/ OpenJDK: http://openjdk.java.net/projects/caciocavallo/ Please, support open standards: http://endsoftpatents.org/

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