LJC Meet-up at LMAX

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About this event

The LJC is delighted to continue our new series of events, aimed at giving all Community members an opportunity to present at an LJC meet-up.

If you have an interesting topic to share, these events are for you. You don’t have to be an experienced speaker - we want to hear your story and offer you a friendly, informal platform to practise and improve your presentations.

For attendees we want this to be a meeting place, where you can talk and network with other technologists in London.
If you’d like to speak at a future event, please submit your talk and bio details here: https://sessionize.com/ljc/

Huge thanks to our friends at LMAX for hosting this event and supporting our Community.

Speaker One:
Simon Ritter - Deputy CTO at Azul Systems
Talk: Java Patterns: Usage and Puzzles

The goal of project Amber within OpenJDK is to explore the inclusion of smaller, productivity-oriented Java language features. One part of this that has delivered new functionality in recent versions is pattern matching.

Pattern matching combines application code logic to test if an expression has a specific type or structure and extract components of its state for processing.

Pattern matching is now well embedded in the Java language using the following features, defined by JDK Enhancement Proposals (JEPs)
• Pattern matching for instanceof (JEP 433)
• Pattern matching for switch (JEP 441)
• Record patterns (JEP 440)
• Unnamed patterns and variables (JEP 456)
• Primitive types in patterns, instanceof and switch (JEP 455)

In this session, we’ll look at the details of these new language features and a more general look at pattern matching.

We’ll also have some fun with several Pattern Puzzlers that show how you need to be careful with some edge cases.

The session will hopefully both be informative and fun!

Speaker one bio:
Simon Ritter is the Deputy CTO of Azul. Simon joined Sun Microsystems in 1996 and spent time working in both Java development and consultancy. He has been presenting Java technologies to developers since 1999 focusing on the core Java platform as well as client and embedded applications. At Azul, he continues to help people understand Java and AzulÕs JVM products.

Simon is a Java Champion and two time recipient of the JavaOne Rockstar award. In addition, he represents Azul on the JCP Executive Committee, the OpenJDK Vulnerability Group as well as the JSR Expert Group since Java SE 9.

Speakers Two:
Andzrej Grzesik - Co-Founder of Datalinks
David Cooke, Developer at LMAX
Talk: Lock, Stock and a Smoking Synchronized

JVM offers a number of ways to implement "mutual exclusion" in multithreaded applications. We will take a deep long stare at synchronized. Very convenient, but at a price - also known as "just an implementation detail". You will learn how this works, what's behind, what's behind the behind, why it matters, what makes "better alternatives" actually better.

What is "adaptive locking"?
What do threads do when they are parked? If you ever wondered, this talk is for you.
You will not leave deflated, unlike an ObjectMonitor.

Speakers two bios:
David is interested in all things low latency Java. At LMAX he works on the SRE team, tackling microsecond level challenges on a complex code base.

This event is organised by RecWorks on behalf of the London Java Community.
The London Java Community is sponsored by Hazelcast, Neo4j, Redis, and Discover