addressalign-toparrow-leftarrow-rightbackbellblockcalendarcameraccwchatcheckchevron-downchevron-leftchevron-rightchevron-small-downchevron-small-leftchevron-small-rightchevron-small-upchevron-upcircle-with-checkcircle-with-crosscircle-with-pluscrossdots-three-verticaleditemptyheartexporteye-with-lineeyefacebookfolderfullheartglobegmailgoogleimageimagesinstagramlinklocation-pinmagnifying-glassmailminusmoremuplabelShape 3 + Rectangle 1outlookpersonplusprice-ribbonImported LayersImported LayersImported Layersshieldstartickettrashtriangle-downtriangle-uptwitteruseryahoo

Hack the Tower and Adopt Openjdk - LJC May 2014 hack day is a hack day for any and all developers to come and collaborate on projects or simply discover new technologies together and enhance their skills.  Bring your laptop and your desire to learn and have fun!

Whether you want to build Java, Groovy, Scala, or Clojure apps, experiment with OpenJDK 8, get to grips with Git & Github, deploy apps with Heroku, try out one of the NoSQL databases like MongoDB or Neo4j or make some some robots dance, there are plenty of interesting things to work on.

We are also co-hosting the Adopt Openjdk hackday

Come hack on the Java implementation that you use everyday!

* Improved OpenJDK test coverage 
* OpenJDK Warnings cleanup 
* Small Bugs Fixes 
* The betterrev project

If you're not familiar with the OpenJDK codebase there will be people there to help you get started, including some from IBM who work on OpenJDK professionally.

Rough Schedule 

You can get into the offices from around 9.30am onwards and have some breakfast and coffee, relax and take in the stunning view from the 26th floor of the Heron Tower.

10.30am - Get together and discuss application ideas & things you want to try out. 
10.45am - Split into groups and get going 
1pm - Lunch time (sandwiches, quiche, fruit and drinks provided, requests taken) 
1.30pm onwards - Keep on hacking until you have had enough or want to go to the pub!

Sign up 
Please include your your full name so I can organise a visitor pass for Heron Tower.  Either update your name on your profile for this community or provide your full name when prompted during RSVP.

In total, there is space for around 100 developers on the day. Food & drink will be provided, thanks to our hosts Salesforce

Sponsor message

Start building & deploying your apps in the cloud with free developer environments from and

Join or login to comment.

  • Julius G.

    After reading the guides, I was daunted, and thought of not attending. But I'm glad I came. It was an informative and useful session - Mani helping us, and pairing with others helped much. There was the bonus of an incredible view of London from The Heron Building. I wished there was more time in the day.

    May 13, 2014

  • A former member
    A former member

    'Twas good to get advice from more experienced members of the community, even if I didn't get much coding done :).

    May 13, 2014

  • Manuela G.

    Very useful, I got a thorough overview of OpenJDK from Mani Sarkar. Busy with installing it and experimenting some basic commands.

    May 12, 2014

  • Rob D.

    Great event, gives a chance to learn about openjdk development in detail

    May 11, 2014

  • Enrico P.

    I really enjoyed working on the OpenJDK, even if I have just moved the first steps following the introductory documents. I really appreciated the help I've been given, especially in some of the tricky passages in setting up the environment properly.

    I hope I'll be able to start contributing after this session.

    Thanks also to the organizers, the offices were amazing, and we enjoyed a fantastic view of the double rainbow as well! :-)

    May 10, 2014

  • Mani

    Very productive and we made great progress in learning more about tests, bugs, issues and other aspects of OpenJDK. Lots of the attendees were upto speed, impressive site! Members of LJC rock! Thanks again to Salesforce and Heroku! Not forgetting John Stevenson - your continuous support is contagious! ;)

    Its always refreshing to work with a group who don't give up and have a massive appetite to learn, improve, collaborate, sync ideas and grasp things quickly.

    2 · May 10, 2014

  • Laszlo S.

    Very useful and productive

    3 · May 10, 2014

    • Mani

      Well done! We are impressed with the speed at which you picked up all the concepts and had success at the many points! ;)

      May 10, 2014

  • Mani

    As a gesture of thanks and gratitude to Sales force, Heroku and John Stevenson, please send out a shout out into your own streams of social media ( Please use these handles and hashtag mentioned in the tweet.

    2 · May 10, 2014

  • A former member
    A former member

    New to openJDK and various low level java stuff.
    But my interests are to get involved.

    Sorry to put my Confusions, here are they.
    1 how to start and
    2 do you require good knowledge of Core Java. As i am DevOps person.
    3 Do you require Architects for this and design pattern knowledge.

    if the about is require, can i be a volunteer for this.

    Apologies for wasting you guys precious time.

    May 8, 2014

    • Mani

      Just come with a laptop* and an open mind.

      May 8, 2014

    • Mani

      Check the documents posted (by me) in the links below, download the VM image, have a read, try out as many things as you can. Make a note of questions or difficulties. Whatever Java knowledge you have is good, we learn as we go. Any additional knowledge is a bonus. Being a Devops you will appreciate the build and tests systems.

      May 8, 2014

  • Mani

    For those joining the Adopt OpenJDK team at the hackday, please have a look at the Getting Started Kit (­­) and Intermediate & Advance experiences (­­) links. These documents help with downloading the respective VM images before hand (download at home please) and also to get familiar with the OpenJDK environment et al.

    If you haven't please sign up to the Adopt-Discuss mailing list at http://mail.openjdk.j...­, any Adopt OpenJDK queries or comments can be posted there for a response.

    May 4, 2014

    • Julius G.

      Thanks for the links - I was wondering how to start preparing

      May 7, 2014

  • Mike B.

    Unfortunately I can't make 10 May, hope it goes well, all the best.

    May 4, 2014

  • A former member
    A former member

    Can we make sure that the list for building entry is updated please? I signed up with my full name last time and still had problems :(.

    May 4, 2014

    • John S.

      The exporting of names from meetup into the building entry is a manual process. The best thing you can do to help is use your real name on your profile. If only one name is on the profile, I copy-paste any answer given in the question prompting you for your name.

      May 4, 2014

28 went

Our Sponsors

  • Our Blog

    Read the latest news from the LJC

  • RecWorks Ltd

    Fixing Tech Recruitment using the Power of Community

  • jClarity

    Java/JVM Performance Analysis Tools & mentoring for Java related matters

  • LJC Aggrity

    Our LJC Aggrity site contains blog posts from our members

  • LJC Book Club

    Our Book club with book reviews from our members

  • Devoxx UK

    Java Community Conference in collaboration with the LJC, 8-10th June 16

  • SkillsMatter

    "Host, help organise, promote, film many of our meetings."

  • IBM

    Build Enterprise-grade apps at start-up speed.

  • New Relic

    New Relic makes sense of billions of metrics a day in real time.

  • Hazelcast

    Hazelcast is the leader in operating in-memory computing.

  • Java.Net

    We are an official Java User Group recognised by Oracle's JUG program

  • JRebel

    Free 3 month J-Rebel license.

  • O'Reilly

    40% discount on printed books and 50% on e-books.

  • Craft Rebellion

    Your choice of fresh craft beer, delivered. For 10% off use ‘LJC'

People in this
Meetup are also in:

Sign up

Meetup members, Log in

By clicking "Sign up" or "Sign up using Facebook", you confirm that you accept our Terms of Service & Privacy Policy