Bangalore Java User Group (Bangalore JUG)

➡️ Talk #1: Field Lessons in Problem Solving Java Issues
Time: 9.45am to 10.15 am
Join us for a deep, hands-on exploration of real-world engineering challenges and solutions drawn from enterprise Java, JavaScript, and Eclipse workloads across both cloud and on-premise deployments. This session unpacks valuable lessons from the field, ranging from resolving memory leaks and analyzing CPU bottlenecks to diagnosing elusive multi-threaded race conditions and conducting postmortem debugging using production core dumps.
Through detailed case studies, attendees will gain practical diagnostic techniques and best practices, learning how to interpret symptoms, assess business impact, and apply effective resolutions. This session is designed to equip developers with the confidence and tools to tackle complex, large-scale production issues in their own environments.
Speaker(s) :
Gireesh Punathil

➡️ Talk #2: Java21 Powering Large Products with Smarter Concurrency and Efficiency
Time: 10.15 am to 11.15 am
JFrog operates tens of thousands of Artifactory containers for customers worldwide, so even “small” inefficiencies quickly turn into large cloud bills.
In this talk I will share two production war-stories that saved us double-digit % CPU and GBs of RAM per node, without touching a single line of business logic.
Story #1 – Faster Boots, Lower CPU:
A profiler led us down an unexpected rabbit-hole in Tomcat’s resource lookup. With ~800 JARs on the classpath, the default class-loading algorithm performed thousands of redundant I/O calls during startup. I’ll show how we confirmed the hotspot and replaced the default loader with a custom resource locator, cutting cold-start time and CPU by >30 %.
Story #2 – Slimmer Footprint, Happier Nodes:
A “blank” Artifactory should be lightweight, yet baseline memory was ballooning. The culprit was Jersey’s MIME-type negotiation building huge caches at boot. We used ByteBuddy runtime weaving to surgically patch Jersey, dropping resident set size by ~700 MB.
Both stories blend detective work with creative, production-safe fixes—practical lessons every Java engineer can apply to large microservice fleets.
Speaker(s) :
Sergey Steinvil
Kunal Mazumdar

➡️ Break: Tea Break
Time: 15mins

➡️ Talk #3: Future-Proofing Java: How JEP 496 Supercharges Engineer Productivity with Quantum-Resistant Cryptography
Time: 11.30 am to 12.30 pm
As quantum computing rapidly shifts from theory to reality, traditional cryptographic methods like RSA and ECC are at risk of obsolescence. Java 24’s JEP 496 delivers a seamless, standards-based implementation of the Module-Lattice-Based Key Encapsulation Mechanism (ML-KEM), a NIST-approved, quantum-resistant algorithm. This talk explores how JEP 496 empowers engineers to integrate next-generation security into Java applications with minimal friction, leveraging familiar APIs (KeyPairGenerator, KEM, and KeyFactory) and multiple security-performance profiles. Attendees will learn how adopting ML-KEM not only safeguards applications against future threats but also streamlines key management, reduces technical debt, and accelerates secure development-directly boosting engineering performance in today’s evolving security landscape.
Speaker(s) :
Manukumar VS

➡️ Finale: Fire-Side Chat with SVP, DevOps Core
Time: 12.30 PM to 1.15 PM
Why was Java picked? 🤔
Speaker(s) :
Yossi Shaul
Moderator :
Prasanna Raghavendra

➡️ Break: Lunch and Networking
Time: 1.20 PM - 2.30 PM

Workshop: GOOGLE ADK USING JAVA
This session focuses on the Google Agent Development Kit (ADK), an open-source framework for building robust AI agents capable of complex tasks and multi-agent coordination. We'll explore various use cases, from conversational AI to sophisticated autonomous systems. Then do a workshop on ADK using Java
Time: 10.00am to 11:00 am
Speaker(s) : Ashutosh S. Bhakare

Talk #1: Crafting clean java: Language features that simplify code
Clean code isn’t just about following best practices - it’s about using the language to its full potential. In recent Java releases, the language has introduced powerful features that help developers write simpler, clearer, and more maintainable code.
In this session, we’ll explore how records, pattern matching, string templates, and other enhancements can transform everyday Java code. Through practical examples and real-world refactorings, we’ll see how these features reduce noise, eliminate boilerplate, and bring clarity to complex logic.

Time: 11.00 am to 11.50 am
Speaker(s) :
Sumanth K S

Talk #2: Java 21 Virtual Threads
In this talk, the speaker aim to delve into the practical implications of Java 21's Virtual Threads (Project Loom). While the promise of effortless concurrency is compelling, integrating Virtual Threads into existing, or even new, highly concurrent applications requires a nuanced understanding, especially concerning traditional synchronization primitives and potential pitfalls. Drawing from real-world experiences and inspired by discussions on modern concurrency paradigms, the talk will explore:
•⁠ ⁠A brief overview of Virtual Threads and their core benefits.
•⁠ ⁠Common concurrency patterns and where Virtual Threads introduce complexities.
•⁠ ⁠Practical considerations and potential "gotchas" when migrating or designing for Virtual Threads.
•⁠ ⁠Strategies for identifying and addressing performance bottlenecks or synchronization issues in a Loom-enabled world.
The goal is to provide attendees with actionable insights into how to effectively leverage Virtual Threads for building performant and scalable Java applications, while proactively navigating the challenges they might present.

Time: 12.00 pm to 1.00 pm
Speaker(s) :
Kapil Rijhwani

Break: Lunch
Time: 1:00pm - 2:00pm

Talk #3: DIY Spring JDBC Client
If you’ve used the new JDBC Client introduced in Spring Boot 3, you already know how refreshingly simple it is compared to the traditional, verbose JPA approach. It’s easy to learn and quick to use—often taking just a day to get productive.

But have you ever thought about building your own?
In this talk, we’ll explore how you can create your own JDBC client from scratch using classic design patterns and modern Java features. Join us to see how Java's evolving capabilities make this not only possible—but doable in just 30 minutes!

Time: 2.00 pm to 3.00 pm
Speaker(s) :
Sathish Kumar Thiyagarajan

Networking
Time: 3:00pm to 4:00pm