Mario Torre

An open Q&A session with members of the OpenJDK Governing Board.

Other people: Mark Reinhold Andrew Haley Georges Saab Doug Lea John Duimovich

Recently open sourced, JDK Mission Control is the industry standard tool for Java performance analysis in production environments. This presentation will introduce the tool and explain how to use it to solve various production time problems with very little overhead.

We will also discuss how application developers can extend their applications to take advantage of the event recording capabilities of the JDK Flight Recorder, now included in OpenJDK 11, and how to create custom tools based on the extensive Mission Control API to analyse specific issues beyond what is offered by default by the Eclipse based tool.

At the end a demo will be shown using the JDK Flight Recorder, JDK Mission Control and OpenTracing together to facilitate deep distributed tracing capabilities.

Other people: Marcus Hirt

Welcome to the Free Java DevRoom

An open Q&A session with members of the OpenJDK Governing Board.

An open Q&A session with members of the OpenJDK Governing Board.

Other people: Mark Reinhold Andrew Haley Georges Saab Doug Lea John Duimovich

Welcome to the 2018 edition of the Free Java DevRoom!

Other people: Andrew Haley

An open Q&A session with members of the OpenJDK Governing Board

Other people: Mark Reinhold Andrew Haley Georges Saab Doug Lea

Welcome to the Free Java DevRoom!

OpenJDK is now a well established Free Software Ecosystem, with a vibrant Community and lots of interesting stuff going on, with projects, repositories, bug database and above all experiments!

This is exciting and fun, but given the challenges of such massive project, it is intimidating and it is easy to get lost. It is also easy to forget that such massive infrastructure requires well defined rules, that are sometime perceived as blocking rather than aiding the participation. To help people wanting to contribute keep track of this intricate forest of development and find their way in, the Adoption Group was created (http://openjdk.java.net/groups/adoption/).

This session is an exchange between few of the hackers directly involved with the Adoption Group and the public, we will answer questions the audience may have in relation to getting involved with OpenJDK, try to define and explain workarounds for most common problems (and blockers!) that newcomers face, discuss some of the projects we are currently involved with, and hope to be your Ariadne's thread to win back the fun of contributing and participating at all levels, without ever getting lost!

Other people: Martijn Verburg Dalibor Topić

(This talk replaces 'Beyond Java 9'.)

Free Java 2016 Welcome - Sunday

Thermostat has evolved a log way from being a specialised tool for performance monitoring and analysis of the JVM, first by encompassing a generic framework for performance analysis and data visualisation and now with the addition of a powerful and advanced new Platform infrastructure that also allow users to build completely standalone projects.

The Platform offers a familiar environment that handles Model View and Controllers objects, presentation layer, threading models, visualisation and also special effects, and a new data architecture.

In this presentation we will demonstrate how to build an application based on Thermostat in few simple steps and how to take advantage of the new architecture to build stunning and visually appealing applications.

Free Java 2016 Introduction - Saturday

There's a ton of stuff going on in OpenJDK, projects, repositories, bug database, experiments. This is a lot of potential fun, but the entrance barrier for newcomers is extremely high, and it's easy to get lost and not enjoy the fun anymore. In order to help people wanting to contribute keep track of this intricate forest of development and find their way out, the Adoption Group was created (http://openjdk.java.net/groups/adoption/).

This session is an exchange between few of the hackers directly involved with the Adoption Group and the public. We will indeed discuss some of the projects we are currently involved with - like the planned global hack days for jsonp, jigsaw and tools that use jigsaw and http 2.0 with language interoperability - but above all we will answer questions the audience may have in relation to getting involved with OpenJDK, both from a technical perspective and a social one, so that next year you can sit together with us helping even more people to jump on the fun!

If you need help organising your next hackday, or you are completelylost tying to get started with OpenJDK, this is the session for you!

Other people: Martijn Verburg Dalibor Topić Daniel Bryant Mani Sarkar

Caciocavallo has been one of the very first external projects to land in the OpenJDK repository and sponsored by the OpenJDK Porters Group. Named after a delicious cheese we're never tired of eating, it had the original purpose of refactoring the AWT peers to allow different implementations to be added to OpenJDK. The project evolved very quickly until it became itself a full implementation of AWT based on Swing with just enough abstraction to allow custom plugging into the Java2D system for rendering. As time passed, this characteristic was used to implement a GUI testing framework running on offscreen buffers to avoid the usual problems of focus stealing and random mouse moving that plague every other GUI testing framework (here everything is emulated!), and finally a full Web based backend to allow application to run remotely but still be visible on the local screen. This talk will cover the progress we have done over the years, we will show how easy is to implement a new backend and how this project could be used to give Wayland support to OpenJDK. We will show the testing framework and finally we will discuss about WebJDK, an idea to give more web oriented functionality to OpenJDK and use the web backend to enable fully cloud based applications.

Other people: Roman Kennke

Debugging performance problems can be a daunting task, especially when you are short on time and lack proper tools that integrate nicely with your custom application landscape. Thermostat was designed to answer the most interesting questions related to performance measurement and application monitoring. It takes advantage of performance metrics and serviceability features of OpenJDK to provide a holistic view of the system. In this session, attendees will get a chance to see Thermostat in action as it is used to analyse programs, gather data, and debug issues affecting performance and functionality.

Other people: Severin Gehwolf

Thermostat is an awesome platform with the focus on Java Virtual Machines monitoring. This short presentation will discuss what has been done in the past two years until the release of Thermostat 1.0 and its current features and will disclose some spoilers on the future of Thermostat.

Thermostat is an awesome platform with the focus on Java Virtual Machines monitoring. With the recent release of the 1.0 version, developers have finalised the plugin API, allowing external contributors to write new tools on top of the platform. This short presentation will discuss what has been done in the past two years until the release of Thermostat 1.0 and its current features and will disclose some spoilers on the future of Thermostat.

Last year, we shared with the Free Java Devroom and the global OSS community our vision for a new open source monitoring and instrumentation tool for anyone running an open Java stack, along with our fledgeling implementation. Since then, we've been hard at work making this vision a reality. Our project has undergone various transformations, including becoming modular not just in terms of deployment but also from a source code perspective with the help of OSGi, a complete overhaul of the API for extending Thermostat, and an amazing visual makeover - attendees from last year may have trouble recognizing it on sight. Along the way we've also added new, compelling features such as detailed thread monitoring, heap dump and analysis, an Eclipse plugin interface, and more functionality available from the command line. Of course, we also had a lot of fun doing it.

In our talk, we will describe the current state of Thermostat, give a demo of what you can do out of the box, and build a toy plugin on the spot so that attendees can see how easy it is to add custom instrumentation.

Other people: Roman Kennke

IcedRobot is an attempt to bring the Android API on OpenJDK. It was first announced at Fosdem 2011, and after only two months of development and a team assembled during the customary Fosdem Free Java Hackers dinner, it was already able to translate most Android bytecode format to Java. This presentation will review the last year of development and will explain future direction and plans for the project.

Other people: Roman Kennke

CacioCavallo is an award winning project sponsored by the OpenJDK porters group. The main project was about refactoring of the graphics stack of OpenJDK to allow of easy porting on various platform. It’s the abstract backend behind most ports and it has been used on field by commercial projects for companies in the embedded and automotive market. During the last year, two new projects have landed in the official Caciocavallo repositories: CacioWeb and Cacio Testing Framework. The first project allows for easy deployment even on platforms without any Java support (like Apple iPad) and makes extremely easy the deployment even without any Java plugin. CacioTest aims to make easy the testing of Graphics stack, providing a reliable, unobtrusive way to run UI and graphics related tests.

Other people: Clemens Eisserer Roman Kennke

Brief Welcome to the Free Java DevRoom

Other people: Andrew Haley Andrew Hughes Ben Evans Dalibor Topić Mark Wielaard Martijn Verburg Sylvestre Ledru Tom Marble