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London Java Community The home for those who work with
Java and the JVM


Our Initiatives

The LJC has many initiatives, all volunteer lead and founded by our organisers and members. Read about our initiatives below.

Adopt a JSR

The LJC has a seat on the JCP and runs Adopt a JSR programme for Java SE (at OpenJDK), Java ME and Java EE (now Jakarta EE).”


The LJC is a founding member of
a new community around building a defacto set of API’s and implementations for Microservices in Java.


The LJC maintains a GitHub repository with LJC specific tutorials etc. Note, most LJC work actually occurs at Adopt OpenJDK, Adopt a JSR, Microprofile and EE4J.


The LJC works on OpenJDK, and co-founded Eclipse Adoptium (the successor to AdoptOpenJDK), the world’s leading FREE OpenJDK distribution!

Speakers Clinic

Speakers Clinic

Working in collaboration with Devoxx UK and Meet a Mentor the LJC organises events to encourage the next generation of speakers.

Jakarta EE / EE4J

The LJC is a founding member of Jakarta EE / EE4J – the new home for Java EE at the Eclipse Foundation.

Our Sponsors

What is LJC about?

The LJC is a broad community of technologists and other associates with Java and JVM-related technologies. Although it is based in London, UK – it has some international membership due to its global programmes (such as Adopt a JSR and Adopt OpenJDK). The LJC hosts regular events including casual catch-ups in a cafe, hack days, evening talks, unconferences, workshops, mentoring, demos, a career mentoring by London’s
Java specialists and much more.

The LJC acts as a voice for Java engineers in London UK as well as globally. This includes but is not limited to creating Adoptium, the world’s leading OpenJDK distribution, representing Java developers worldwide on the Java standards body, and contributing towards charitable works.

Join Meetups


Our meetups range from small focus groups deep diving into a tech through to regular 100+ attendee presentations by the world’s leading technologists. There’s several events to join each month!

Talk to us on Slack


Our LJC Slack group is a vibrant real time community where you can speak with your fellow technologists and world leading experts about topics that matter to you!

Become a Speaker


The LJC actively encourages speakers of all levels, including novice ones! We hold regular speaker clinics to train the next generation of confident technology speakers.

Sponsor the LJC


The LJC as multitude of events and global initiatives impacting hundreds of thousands of developers due to the generosity of Recworks, volunteers and key sponsors. You can donate directly or talk to us about a sponsorship package.

LJC Unconference 2021

Once a year we have our annual Unconference. This is our best event of the year, is always sold out, and has been the starting point for many international conference speakers. Read more on the site here:

ljc event feature

LJC Leaders


Martijn Verburg

Founder / Co-organiser

Barry Cranford

Founder / Co-organiser

Simon Maple


Want to know more?


Since it’s inception, RecWorks have always invested in and sponsored the London Java Community both in terms of time and money to power the events. Over the years that relationship has now become more official in that for any placement which came through an LJC event, RecWorks now gives a % of all the placements back to the community. 

Here is a selection of their latest jobs:

Get to know us.
Join in.