BrabantJUG

Details
On 29 October, BrabantJUG and the/experts will be hosting a meetup. We are happy to announce some amazing speakers that will join us: Maarten Mulders, Laura Kester and Jos Roseboom.

Hope to see you there!

Timetable
17:30 Walk-in with food
18:30 Welcome
18:45 When ORM becomes OMG: Performance Pitfalls in JPA and Friends by Jos Roseboom
19:30 Break
19:45 Measuring Without Ruining the Metric by Maarten Mulders & Laura Kester
20:30 Drinks and chat

When ORM becomes OMG: Performance Pitfalls in JPA and Friends
JPA makes database interaction feel almost magical—until your app grinds to a halt. In this talk, we’ll take a tour through the common (and not-so-common) performance pitfalls that turn object-relational mapping into an object-relational mess. From data loading surprises to connection mismanagement, we’ll explore real-world issues using a sample app: the FunFactStore, where fun facts are sold, but bugs are free.

We’ll dig into how seemingly harmless libraries can sometimes do more harm than good, and how tooling can help you spot trouble before your users do. Whether you’re using Spring Data JPA, navigating tricky transaction boundaries, or just wondering why things suddenly got slow, this session offers practical insights—and maybe a few fun facts.

Measuring Without Ruining the Metric
Many of us have experience with organisations where teams are assessed based on the number of story points or stories they complete. We also know what usually happens next: teams focus on delivering the "right" number of points to avoid scrutiny from management. This approach diminishes the metric's value. When people optimise for the measurement rather than the underlying goal, the metric ceases to provide useful insights.

In this talk, we will provide insight into how to measure a value without rendering it meaningless. We will also share practical approaches for using metrics as a useful mechanism. Instead of steering teams toward higher numbers, we show how measurements can help start conversations, reveal bottlenecks, and support your hypotheses for improving your way of working.

Join us to learn how leaders can guide actual improvements rather than dashboards that only seem to suggest improvement.

About Jos
Jos gets a smile on his face when he makes other people happy by letting a computer do what they don’t like to do. He has been trying to do so professionally for the past 17 years.
In his spare time, Jos likes to play tennis. He is a trainer/coach for kids playing the typical Dutch sport korfball.

About Maarten
Since 2015, Maarten has taken the stage over 70 times at 40+ events across 20 countries, inspiring audiences with his practical insights and passion for technology.

His experience spans:
* Community-driven events: local meetups and Java User Groups;
* Top-tier international conferences: including JavaOne, Devnexus, JavaZone, multiple Devoxx editions, and J-Fall;
* Private engagements: in-house company events and guest lectures at both primary and professional education institutions.

Beyond speaking, Maarten actively shapes the developer and speaking communities. He spent three years on the J-Fall Program Committee, and now mentors upcoming speakers through the NLJUG Speaker Mentoring Programme and Info Support’s internal Speaking Community.

About Laura
Laura Kester is Requirements Engineer and Product Owner at Info Support.

As a requirements engineer, she bridges the gap between stakeholders and development teams. She is passionate about understanding how processes and systems work and ensuring software solutions truly meet user needs. With her background in Interaction Technology, Laura brings a unique blend of engineering, design, and ethical perspectives to her work.

She loves learning new things and sharing her knowledge and perspectives with others.