Extending Functional Pipeline with Gatherers with Dr. Venkat Subramaniam

It's that time of year again when we are incredibly fortunate to host the amazing Dr. Venkat Subramaniam at our monthly meeting. Venkat is a published author, educator, trainer, internationally renowned speaker, and Java Champion. But more importantly, you could not meet a more caring and wonderful person.

Abstract -
The Stream API provides a wealth of methods, such as filter, map, takeWhile, limit, and more, to build functional pipelines. Yet you may encounter situations in your applications that do not readily lend themselves to these built-in methods. The new gatherer() function, along with the Gatherer interface, gives you the necessary tools to create your own custom steps in the functional pipeline. In this presentation, learn about the different types of gatherers and how to implement them using practical live-coded examples.

***DEVNEXUS - March 4-6, 2026. Atlanta's Enterprise, Java, AI, and Developer Tools Conference***

Devnexus is the largest and longest-running Java ecosystem conference in the U.S. and a leading global tech event. Founded by the Atlanta Java Users Group in 2004, it draws 1500+ developers for two or three days of hands-on workshops, expert-led sessions, in-person mentoring by Java Champions and speakers, and live demos. With 10 tracks and 100+ sessions, Devnexus offers deep dives into the latest technologies and a chance to connect with top technologists and fellow developers.

Tracks:

• ​AI Engineering & Infra
• ​AI Generative
• ​AI in Practice
• ​Architecture
• ​Core Java
• ​Java Frameworks
• ​Leadership
• ​Security & Dev Tools

If you live in Atlanta, you are lucky this is here. You can see the best speakers in the Java world without traveling, planes, hotels, or nights away from home.

Check out the 2026 program here.