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London Java Community

The home for those who work with Java and the JVM

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.

Upcoming Event

LJC and Discover Financial Services meet-up

Join us for a great meet-up with new LJC sponsors Discover Financial Services. We’ve got two amazing speakers for you, talking about contract testing for microservices success and the JDK security enhancements in Java 17 to 21. Agenda: 1800 Arrivals 1830 Welcome from Discover Financial Services 1845 Praveen Erode Mohanasundaram presentation 1930 Break for refreshments 2000 Ana-Maria Mihalceanu presentation 2045 Close and departures Speaker details: Praveen Erode Mohanasundaram, Expert Application Developer, Discover Financial Services Title: Contract Testing: A Crucial Strategy for Microservices Success As teams embark on the journey towards microservices architecture, the promise of swift and independent deployments becomes a driving force. However, the transition often hits roadblocks when relying heavily on traditional end-to-end testing strategies. While providing a high level of confidence, these strategies can impede deployment frequency, create inter-team dependencies, and diminish team autonomy.Join me as I delve into Discover Financial Services' experience in modernising our systems, the bottlenecks we encountered, and how we are attempting to overcome them by adopting contract testing. Discover the diverse contract testing strategies and tools that played a pivotal role in our journey, and witness how this approach not only removed bottlenecks in our CI/CD pipeline but also fostered a culture of agility and autonomy.If you're navigating the complexities of microservices and seeking effective testing strategies, this session will provide valuable insights to empower your team in achieving the desired benefits of rapid, independent deployments. Speaker Bio: Praveen Erode Mohanasundaram is a hands-on engineering leader with nearly two decades of experience in the financial services industry. His diverse background spans backend development, testing, architecture, devops, cloud computing and leadership of teams, guilds, and large modernisation programs. Currently, he is instrumental in building new technology capabilities for Discover® and contributes to open source projects in his free time. Praveen possesses a profound understanding of the Payments landscape and has recently played a pivotal role in building, steering, and scaling the contract testing practice at Discover. Furthermore, he enjoys continuous learning and exploring new facets of life, being analytical by nature, a strategic thinker, highly focused, responsible, and a passionate technology enthusiast. Ana-Maria Mihalceanu, Senior Dev Advocate, Oracle Title: From Java 17 to 21: A Showcase of JDK Security Enhancements In the dynamic landscape of software development, security remains paramount. This session offers a comprehensive showcase of the security enhancements after JDK17. From the evolution of modern cryptographic algorithms to the intricacies of JDK security configuration, API advancements, and the game-changing role of JDK Flight Recorder, this showcase will equip you with a comprehensive understanding of how the JDK's commitment to security has matured over time. Join this talk to witness the evolution of security within the JDK, as we bridge the gap from Java 17 to today, and illuminate the path to a more secure future. Speaker Bio: Ana is a Java Champion Alumni, Developer Advocate for the Java Platform Group at Oracle, guest author of the book "DevOps tools for Java Developers", and a constant adopter of challenging technical scenarios involving Java-based frameworks and multiple cloud providers. She actively supports technical communities' growth through knowledge sharing and enjoys curating content for conferences as a program committee member. To learn more about/from her, follow her on Twitter @ammbra1508. This event is organised by RecWorks on behalf of the London Java Community. The event is sponsored by Discover










The next event is coming soon!

Our Initiatives

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


The Eclipse Foundation is a non-profit organisation that supports open source software development. It provides a place for developers to collaborate on and innovate open source projects. The Eclipse Foundation also provides services to the Eclipse community, such as IP management, ecosystem development, and marketing.

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

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


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


Sponsor the LJC

The LJC has a 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.

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!


Barry Cranford

Founder / Co-organiser

Know More About Us?

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. 

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