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Boston Java Users ACM Chapter (formerly NEJUG) cover photo

Boston Java Users ACM Chapter (formerly NEJUG)

Burlington, MA, US

1,136 members · Public group

Organized by Mahesh Achary and 4 others

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What we’re about

Monthly presentation nights providing technical presentations of interest to Java software developers, especially focusing on aspects of the Java language and JVM, system & application architecture, third party frameworks & components, as well as other areas of interest (e.g. career management, business-social skills, pizza, etc.).

All are welcome to attend our events – you do not need to be an ACM member!

We do ask that folks RSVP to events here on Meetup so we can provide an attendee list to our host venue the day before each event. Additionally, please ensure that the name on your Meetup profile roughly matches your ID to ensure smooth admission to events.

Upcoming events (4+)

Thu, Sep 25, 2025, 6:00 PM EDTRAGs to Riches with Oracle AI Microservices Sandbox
Oracle, Burlington, MA
Join us to learn how easy it is to prototype an AI Assistant, ChatBot or other GenAI project with the Oracle AI Microservices Sandbox – a free, open-source, zero-code tool for rapid experimentation and iteration. Use any LLM, any embedding model, any data, with the full power and security of Oracle Database 23ai AI Vector Search. Keep your sensitive data secure and control, costs with self-hosted models, measure the accuracy and performance of your project and optimize model choice, hyperparameter values, chunking and embedding strategies and more for your particular use case and corpus. Eliminate hallucination and knowledge cutoff. Easily compare performance of models. Experiment and optimize with confidence!

Speakers:
Mark Nelson is a seasoned Architect and Developer Evangelist at Oracle, where he leads a talented team dedicated to showcasing the power and versatility of Oracle’s technologies. With a focus on enabling developers to build exceptional applications, Mark and his team work across cutting-edge areas such as vector databases, JSON, event mesh, caching, and Generative AI. Mark’s primary mission is to demonstrate how Oracle’s innovations integrate seamlessly with frameworks like Spring Boot, making it easier than ever for developers to create scalable and efficient applications.

Doug Drechsel: With a career spanning over three decades, Doug Drechsel has accumulated extensive experience and expertise in software development, system architecture, and technical leadership. His journey has been marked by significant contributions to major projects and the development of innovative solutions across various domains. Throughout his career, he has demonstrated a consistent ability to lead technical teams, drive innovation, and deliver robust software solutions. Doug’s extensive experience with Oracle technologies, cloud-native platforms, and micro services architecture positions him as a valuable asset for any forward-thinking organization.

Note:
Please RSVP for this event by the day before it happens so we can give the attendee list to the venue host/sponsor. If your name isn't on the list, you won't be allowed in. Also, make sure the name on your Meetup profile is similar to the name on your ID, which you'll need to show when you check in.
40 attendees+35
Thu, Oct 9, 2025, 6:00 PM EDTWhat's Going Wrong with my JVM?! - A Guide to First Time Failure Analysis
Oracle, Burlington, MA
It's 2am Friday night, and you have a large software deployment in 5 hours. Suddenly, you receive alerts for your primary business application. The application is up, it's just not responding, and the user tickets are piling up. What's going wrong? How do you tell?

For situations like these, you need to have already captured the data that can help you quickly get a sense of the what's going wrong. Yet, many production environments have not enabled such data collection and some diagnostics have a performance cost that is unsuitable for many production applications. So, what is recommended and what can you do with the data you're allowed to collect?

In this session, we’ll look at some of the most commonly reported problems for Java applications, Java heap memory issues, and how to use low-cost data collection to diagnose those problems at first time failure.

Speaker:
Sandra Payne is the JVM Area Lead for Java Platform Group Support at Oracle. She began working with the Java SE Support team at Sun Microsystems in Burlington, MA, over 20 years ago and has spent the past several years specializing in JVM technology, diagnostics, and performance tuning. When not solving the world's JVM issues, you will lately find her cycling, traveling, or hanging out with her vibrant son, Sam.

Note:
Please RSVP for this event by the day before it happens so we can give the attendee list to the venue host/sponsor. If your name isn't on the list, you won't be allowed in. Also, make sure the name on your Meetup profile is similar to the name on your ID, which you'll need to show when you check in.
18 attendees+13
Thu, Oct 23, 2025, 6:00 PM EDTTesting GenAI apps in Java with Docker and Testcontainers
Oracle, Burlington, MA
The rise of Generative AI is reshaping how we build and test applications. While frameworks like LangChain4j and Spring AI help Java developers integrate AI into their systems, ensuring these applications behave reliably is another story. In this session, we’ll explore how to create isolated, reproducible environments to test AI behaviours, how to introduce determinism into your GenAI systems with Testcontainers, and how to leverage the Docker Model Runner to enhance your local experience of GenAI-powered app development.

Speaker:

Anna Chernyshova is a Solutions Engineer @ Docker, ex-CS Engineer at AtomicJar (the company behind Testcontainers and Testcontainers Cloud). Passionate about developer productivity, containerization, Testcontainers, and shift-left testing in general. Open-source contributor, Java and GenAI lover.

Note:

Please RSVP for this event by the day before it happens so we can give the attendee list to the venue host/sponsor. If your name isn't on the list, you won't be allowed in. Also, make sure the name on your Meetup profile is similar to the name on your ID, including both your first and last name, which you'll need to show when you check in.
13 attendees+8
Thu, Nov 13, 2025, 6:00 PM ESTDataFrame - a Swiss Army Knife of Java Data Engineering
Athena Health , Boston, MA
If you ever needed to write an ETL job, analyze your logs or even just read an Excel file, you may have discovered that it is not easy with “standard” Java. So, do you need to switch to Python or deploy on a “big data” stack like Spark or Flink to do data processing?

This talk is about DataFrame data structure that handles the above and many other data tasks. It will demonstrate a lightweight DataFrame object from the open-source DFLib library (https://dflib.org) and a couple of extra techniques that are still somewhat exotic in Java, such as Jupyter notebooks and visual charts. You will not have to learn Python after all to be a data engineer!

Speaker:
Andrus is a passionate open-source developer and a member of the Apache Software Foundation. He started programming in Java in 1998 and has founded several open-source projects, including Apache Cayenne (a developer-friendly ORM), Bootique.io (a lightweight Java app platform), Agrest.io (a framework for dynamic REST services), and DFLib (a DataFrame library for Java). In his day job, Andrus is an IT entrepreneur and runs the software company ObjectStyle.

Note:
Please RSVP for this event by the day before it happens so we can give the attendee list to the venue host/sponsor. If your name isn't on the list, you won't be allowed in. Also, make sure the name on your Meetup profile is similar to the name on your ID, which you'll need to show when you check in.
6 attendees+1

Past events (46)

Thu, Sep 11, 2025, 6:00 PM EDTJava Does What Now? (Java 21 version)
This event has passed
67 attendees+62

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