Devoxx (formerly named JavaPolis) is an annual European Java, Android and HTML5 conference created in 2001 by Stephan Janssen, organized by the Belgian Java User Group (BeJUG). The conference takes place every year around November. With over 2,800 attendees in 2006, JavaPolis became the biggest vendor-independent Java conference in the world. In 2008, the conference was renamed Devoxx.
With over 3300 attendees, Devoxx 2011 was sold out 6 weeks before the event. In 2012, the conference was once again sold out the 4th of October  6 weeks before the event, reaching 3400 attendees from 40 different countries.
In 2012, the first edition of Devoxx France, organized by the Paris Java User Group took place from 18/4 until 20/4 in Paris. With more than 1200 attendees and 149 speakers Devoxx France was sold out 1 week before the event.
The first edition of Devoxx 4 Kids 2012  was organized in Ghent (Oct 13th) and Brussels (Oct 20th) attracting 65 teenagers between 10 and 14 years. The teenagers played with Scratch, programmed Lego Mindstorms and discovered the wonderful world of Mars Rovers and the NAO robot.
Devoxx UK 2013 was announced during the opening keynote of Devoxx 2012 (November 14, Antwerp). The first edition of Devoxx UK was a two-day conference hosted at the Business Design Centre in London on March 26–27. The event ran back to back with Devoxx France and attracted over 500 attendees in its first year. Devoxx UK was spearheaded in 2013 by Ben Evans, Martijn Verburg, Dan Hardiker and Stephan Janssen in close collaboration with the London Java Community. In January 2014, Mark Hazell was appointed the new Chairman for Devoxx UK. He will focus Devoxx UK efforts, alongside Dan Hardiker, Stephan Janssen, James McGivern, a program committee of developer volunteers and community groups including the London Java Community.
In 2014, during the opening keynote at Devoxx BE, Devoxx PL was announced. Unlike all other editions, this Polish conference is not built from the ground up. It will replace a conference formerly known as 33rd Degree. The first edition of this event is planned to take place in Kraków Congres Centre on 22–24 June 2015.
Devoxx (BE) takes place in the second-biggest European cinema complex, the Kinepolis, located in Antwerp, Belgium. As a result, the speakers' video and slides are projected on the huge cinema screens using the available THX audio setup. Devoxx France 2014 was held at the Marriott Paris Rive Gauche conference center, while Devoxx france 2015 will be held at the Palais des congrès de Paris.
Devoxx UK 2014 was held from 12 June to 13 June at the Business Design Centre, London, a former Victorian agricultural hall situated in Islington.
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