- java-devroom - lists.fosdem.org

Talk Proposal: Just-in-time compiling Java in 2020
by Doerr, Martin 02 Dec '19

02 Dec '19

Title: Just-in-time compiling Java in 2020 Abstract: Client compiler, server compiler, JVMCI, Graal ... What are we using today and how do they work together? In this talk I'll give and overview of the Just-in-time compilers included in OpenJDK and explain how to play with them. I'll also address Just-in-time compiler threads and resource related issues. Recording me on audio and/or video is ok. Brief Bio: Martin Doerr is part of SAP's JVM team since 2011. He's contributing to OpenJDK in various areas of the JVM like Just-in-time compilers (C1 and C2) and runtime code. Furthermore, he's serving as OpenJDK reviewer and actively maintaining and improving processor specific code for IBM Power and z Systems.

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Talk Proposal: Apache Maven Project - The Foundation of Building Software
by Karl Heinz Marbaise 01 Dec '19

01 Dec '19

* Title: - Apache Maven Project: The Foundation of Building Software * Abstract: The Apache Maven Project is one of the most used build tools in the Java world. One of the challenges is to support more or less all Java versions from 1.7 (or even earlier) up to the most recent versions including early access versions. Another part is to take a look into the future, what kind of things we might change to keep up with the current evolution of the Java world. * What the audience will learn from the talk: It will be shown how the Apache Maven team is handling the different challenges to keep on the line with the Java release train and of course with the wishes of the community. Furthermore we will take a look into the future of Maven and what kind of ideas we have. For example how to evolve Apache Maven for the next years. * How can people help out with the project: - Currently the project is being run by a number of people (less than 10) in their spare time. This means we would appreciate any help. * Bio: Karl Heinz Marbaise is an Apache Software Foundation Member and Apache Maven PMC and working as a german freelance devops. Working with Java, JUnit Jupiter, AssertJ, Spring Boot, Jenkins, learning Go. Twitter: @khmarbaise Blog: https://blog.soebes.de Recording: acceptable under a CC-BY-2.0 license (DEFAULT) Kind regards Karl Heinz Marbaise

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Talk Proposal: AdoptOpenJDK Quality Assurance, AQA: You're Soaking In It
by Shelley Lambert 01 Dec '19

01 Dec '19

Title: AdoptOpenJDK Quality Assurance, AQA: You’re Soaking In It Abstract: Last year, AdoptOpenJDK began sharing our plans for an open and transparent quality plan for free Java to ‘make quality certain to happen’ for our growing set of enterprise consumers. During the past year, the project has surpassed 100 million downloads showing an overwhelming interest from the community for free and fully verified Java binaries. With this phenomenal uptake, the weight of responsibility to continue to deliver high quality binaries and in celebration of this year’s theme of ’25 in 25’, this retrospective looks at some of what we have learned. At AdoptOpenJDK, we build and run many categories of tests across multiple platforms, versions, and implementations, often running in excess of 87,000,000 tests per night. We have the luxury of building off of 25 years of verification effort to take the best from the past while improving as we move into the future. This talk will share some interesting insights, give an update on performance testing, tools and results available to the community, as well as some initial findings from our deep learning project that generates Java fuzzers. A whirlwind 25 minutes to cover the cool collaboration and innovation happening as part of AQA to verify open and free JDK binaries! Bio: Shelley Lambert is the Global Test Lead for IBM Runtime Technologies. Shelley joined the IBM J9 team in 2005 after many years writing network management software in the telecom industry. She serves on the Technical Steering Committee (TSC) at the AdoptOpenJDK project and guides the AdoptOpenJDK Quality Assurance (AQA) initiative. She and her team, in collaboration with many wonderful contributors, have delivered test strategy, test code, tools, delivery mechanisms into the AdoptOpenJDK, Eclipse OpenJ9, and Eclipse OMR open-source projects. Recording me on audio and/or video is acceptable under a CC-BY-2.0 license

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Talk Proposal: Operator Overloading for Java - Hack or Fiction?
by Mahmoud Abdelghany 30 Nov '19

30 Nov '19

Abstract TL;DR - a talk about an operator overloading side-project. How do you compare apples and oranges? Simple..you overload the operator(s). Operator overloading is one of those things that is absurdly useful for certain types of programming(math oriented stuff obviously), and yet the term double edged sword would be the understatement of the decade if it was used to describe it. As someone who has had to bear the brunt of the lack of operator overloading whilst doing the aforementioned types of programming, I decided that the benefits far outweigh the consequences, and concluded that I should see if I could do something about it. Needless to say…~~the beast was stunned~~ it turned out to be a very difficult problem to solve. Can’t say I’ve solved it 100%, but come watch the blooper reel, and the fruits of my labor. Recording: sure Bio: TBD Twitter: @blackbeard0x14e Regards, Mahmoud Abdelghany Sent with ProtonMail Secure Email.

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Talk Proposal: The status of Djoom 3 - a Java port of Doom 3
by Mahmoud Abdelghany 30 Nov '19

30 Nov '19

Abstract TL;DR - a talk about a Doom 3 port side-project, and some of the biggest gotchas. A couple of years ago I decided it was a good idea to port Doom 3 from C++ to pure Java(with OpenGL). Not my brightest moment, but to be fair, I didn’t think I would still be working on it at the time you’d be reading this. If I had to use a single phrase to describe this journey, it would be “treasure trove of knowledge”. Regardless, the game has been working for a while now, buggy alas, but working nonetheless. So join me for a demo, and a short trip down memory lane exploring some of the important lessons I learned…. Recording: sure Bio: TBD Twitter: @blackbeard0x14e Github: https://github.com/blackbeard334/djoom3 Regards, Mahmoud Abdelghany Sent with ProtonMail Secure Email.

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Talk Proposal: Hacking on GraalVM: A (very) Rough Guide
by Andrew Dinn 29 Nov '19

29 Nov '19

Title: Hacking on GraalVM: A (very) Rough Guide Andrew Dinn and Josh Matsuoka Abstract: The GraalVM project provides, among other options, a means to deliver Java programs as compact, self-contained, fast-startup native images. GraalVM has been moving from research to development for quite a few years now. However, it is only just beginning to be properly integrated with the latest OpenJDK releases and there is still much to be done to get it fully productized and to improve usability and performance. This talk will recount our joint experiences of trying to add new and/or improved capabilities to the the GraalVM code base. Our story will stumble gracelessly from one pitfall to the next cock-up in the hope that by exposing and explaining our own history of lamentable error and occasional failure you will be able to avoid being doomed to repeat it. We will provide a guide to getting started and building GraalVM, an overview of the how the compiler, native image generator and other elements of the GraalVM toolkit operate plus a map of what code sits where in the source tree and how it fits together and offer tips for debugging the Graal compiler and native image generator -- all the tasks you will need to perform in order to attain a vantage point from which to change or add to the current functionality. Preferred time 40 minutes. Video recording and dissemination under the usual FOSDEM terms is acceptable. regards, Andrew Dinn ----------- Senior Principal Software Engineer Red Hat UK Ltd Registered in England and Wales under Company Registration No. 03798903 Directors: Michael Cunningham, Michael ("Mike") O'Neill

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Talk Proposal: Helpful NullPointerExceptions - The little thing that became a JEP
by Langer, Christoph 29 Nov '19

29 Nov '19

Title: Helpful NullPointerExceptions - The little thing that became a JEP Abstract: One of the most prevalent - if not the most prevalent - exception type in Java is the NullPointerException. While Java set out to overcome the possibilities to do the mistakes one can do when programming in languages like C/C++ by not exposing pointers in the Java language, the misleading term 'pointer' sneaked into this exception. To this day, NullPointerExceptions thrown by the runtime system didn't contain messages. All you had was a callstack and a line number. But in typical expressions and statements there are several dereferences where an NPE can occur in one line. We - some engineers in the SAP team - thought this could be helped by a little enhancement. The new NPE message gives precise information about the location and tries to explain what was going on when a null reference was encountered. However, due to its prominent nature, it eventually became a JEP. In my talk I'll demonstrate the improvements that come with this enhancement. I will lift the hood a little and provide a glance at its implementation details. And finally I'll say some words about the current status and share some ideas for further improvements in the area of exception messages. Recording me on audio and/or video is acceptable. Brief Bio: Christoph Langer is an engineer in SAP's Java VM team. He's engaged in the OpenJDK project in various areas, currently co-maintaining JDK 11 updates. Microblog URL: https://twitter.com/TheRealClanger

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Talk Proposal: G1: To infinity and beyond
by Stefan Johansson 29 Nov '19

29 Nov '19

Title: G1: To infinity and beyond Abstract: G1 has been around for quite some time now and since JDK 9 it is the default garbage collector in OpenJDK. The community working on G1 is quite big and the contributions over the last few years have made a significant impact on the overall performance. This talk will focus on some of these features and how they have improved G1 in various ways. We will also take a brief look at what features we have lined up for the future. Recording: That's ok. Brief Bio: Stefan is a developer working for the HotSpot GC-team at Oracle. He joined the GC-team 6 years ago and has been active in OpenJDK since then. Prior to working directly in the JVM he worked on other JVM related projects at Oracle/Bea since 2006. Microblog: https://twitter.com/kstefanj/ Thanks, Stefan

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Talk Proposal: The OpenJDK JVM : Securing a moving target
by Andrew Dinn 29 Nov '19

29 Nov '19

Title: The OpenJDK JVM : Securing a moving target or What could possibly go wrong? Abstract: The OpenJDK Java Virtual Machine presents some interesting challenges when it comes to guarding against potential vulnerabilities. This talk will explain how dynamic class-loading, JIT compilation, speculative compilation and other aspects of the JVM's operation present a moving attack surface that presents some very different challenges to those found in other programs or runtimes. This talk won't say anything about specific vulnerabilities but it will identify a few areas of the OpenJDK JVM where some of these unique types of vulnerability have been identified and resolved. It may teach you some things you didn't know about the complexity of the JVM and hopefully reassure you that the OpenJDK devs are very aware of what could possibly go wrong. Whether we have got it all right is left as a follow-up exercise for attendees. Speaker: Andrew Dinn is a Senior Principal Software Engineer in Red Hat's Java team, mostly working on the JVM. He is an active member of the OpenJDK Vulnerability Group. Andrew also leads JBoss project Byteman. Recording: Ok by me!

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Talk Proposal: Building GraphQL services in Free Java
by Ben Evans 27 Nov '19

27 Nov '19

Title: Building GraphQL services in Free Java Abstract: GraphQL has not permeated the Java world to the same degree as in other languages. This talk discusses GraphQL as an important new technology for Java developers, and explains why and how we use it at New Relic to provide open APIs, the problems we faced and the open-source libraries we created to solve them for ourselves and the community. We would be very interested in cooperating with other Free Java devs working with GraphQL and are actively soliciting contributions for our libraries. Recording: OK to record and license under CC-BY-2.0 Presenters: Ben Evans & Jason Clark Ben Bio: Ben Evans is Principal Engineer and Architect for JVM technologies at New Relic. Prior to joining New Relic, Ben co-founded jClarity (acquired by Microsoft) and was Chief Architect (Listed Derivatives) at Deutsche Bank. Ben has been active in Free and Open Source Software for over 20 years, co-founded the AdoptOpenJDK initiative (with Martijn Verburg), and served on the JCP Executive Committee for 6 years. Jason Bio: Jason Clark fell in love with programming as a young boy watching his dad work in Clipper and dBase III (no, really). The obsession sparked there continues to this day. He works for New Relic, and in his spare time contributes to the Shoes project. When not at work, he enjoys cycling, reading, and hanging out with his family.

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