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Hack the Tower and Adopt Openjdk - September 2014 hack day is a hack day for any and all developers to come and collaborate on projects or discover new technologies together and enhance their skills.  Bring your laptop and your desire to learn & 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 & 27th floors of the Salesforce Tower (formerly known as 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 Salesforce Tower, otherwise your entry to the event may be delayed.  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 150 developers on the day. Food & drink will be provided, thanks to our hosts Salesforce

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  • Mani

    Thanks to Heroku & SalesForce for hosting us for the hackday today. We got plenty done. Well done to the attendees of the Adopt OpenJDK group, your contributions and efforts are highly appreciated. It was great to see you all quickly learn and progress through installation, building images, and running and writing tests.

    The respective documents (see links below under the previous post) have been updated with new findings, please take a look and try them out.

    2 · September 14, 2014

    • John S.

      Thanks everyone. Really happy to be supporting the development of the Java Platform.

      3 · September 14, 2014

  • Nicky

    I'd like to start writing some web based games - things where all players don't share the same information (e.g. a Scrabble clone, where the players have different letters). If anyone's interested in doing some Java web apps like that, please come and find me.

    (I'm writing this here, as I'd rather not speak in front of a crowd at the event!)

    September 9, 2014

    • John S.

      Or as others have done, add it to the comments and remind me to read it out :)

      September 10, 2014

    • Nicky

      Richard - yeah, we can come up with some stuff today. I'm thinking mainly things that aren't too graphics intensive (HTML/CSS/JS, since we're talking web apps), but it might be cool to look at the stuff you've been doing. Come and find me!

      September 13, 2014

  • Peter

    Unfortunately I have to be away from London urgently. So I can no longer attend.

    September 13, 2014

  • Carl Matthew J.

    It looks like I am double booked with a Tesco Hackathon for the same weekend. So many Hackathons I ought to invest in a sturdy axe!

    September 9, 2014

    • Carl Matthew J.

      I am juggling far too much stuff right now. Maybe I am just a sucker for a good Hackathon.

      September 11, 2014

    • John S.

      Surely you can never have too many things to go to, just less time to watch TV. I have a hackathon every weekend for the next 5 weeks, then October HackTheTower after that :)

      September 11, 2014

  • Francesco D.

    I'd like to participate. Francesco Degrassi

    September 8, 2014

    • John S.

      Thanks Francesco. I am getting you added now.

      September 10, 2014

  • Silvestre A.

    Unfortunately I can't attend this one.
    Updating my RSVP.

    September 9, 2014

  • John S.

    If the RSVP is closed for HackTheTower, you can still come if you add a comment (with your first & last names). Or email me at john @

    Sorry, I have to close signups early as I now have to give a weeks notice of 99% of the guests.


    September 8, 2014

  • Mani

    For those hacking away with the OpenJDK, as usual we have the beginners guide (Getting Started Kit -­). Have a look at the new section 'Known issues' to address some recent issues. If you have a problem log it with us, if you have solved any such problems let us know so we can add it to this document.

    For the intermediate and advance folks, we have the (Intermediate & Advance experiences -­). A number of new sections have been added from half-way through the document i.e. OpenJDK developers guide, list of JEPs, list of examples of tests, etc... Plenty of reading this time before we start writing patches - see if any of the JEPs fancy your coding appetite.

    1 · July 22, 2014

    • Mani

      That's my usual shout-out before we kick-off any Adopt OpenJDK hackdays!

      2 · July 22, 2014

  • Mike B.

    Hi Folks,
    Sorry to miss you again but I'll be working away that weekend. Hope it god well, look forward to seeing you soon.

    July 22, 2014

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