A Java geek

Privacy for subdomains: the problem

I recently learned about a new way to leak your privacy, and it’s a scary one. Before going further, know that I’m not a network engineer: perhaps if you work in this field, you’ve known it for your whole career, but it’s quite new to me. Let me share my findings, and you can judge for yourself. Since the original post was quite lengthy, I have broken it down into two installments: the problem and the solution. The situation I own my own domain.

Development

Comparing transitive dependency version resolution in Rust and Java

You learn by comparing to what you already know. I was recently bitten by assuming Rust worked as Java regarding transitive dependency version resolution. In this post, I want to compare the two. Dependencies, transitivity, and version resolution Before diving into the specifics of each stack, let’s describe the domain and the problems that come with it. When developing any project above Hello World level, chances are you’ll face problems that others have faced before.

Java

Clean Design, Strong Client: The way of the Elasticsearch's Java SDK

Java has a vast ecosystem of APIs, not all of which are effective or easy to learn. Developing a good API is not trivial: misdesigning key elements, defining simple abstractions, and threading models are among the themes that must be addressed. The official Elasticsearch Java SDK is a project with a design effort that has been made to address these elements.

Development

Thoughts on object creation

Creational patterns were first described in the famous Gang of Four’s Design Patterns. The book presents each pattern in a dedicated chapter and follows a strict structure for each one: intent, motivation, applicability, structure, participants, collaborations, consequences, implementation, sample codes, known uses, and related patterns. The intent pattern presents a succinct goal of the pattern, while the applicability tells when you should use it.

Technical

GitHub workflows tips and tricks

I’ve quite a lengthy experience with GitHub workflows, but not up to the point where I can claim I’m an expert. However, I recently developed a new workflow, and it prompted me to write this post. Feel free to add your own. What are GitHub workflows? A workflow is a configurable automated process that will run one or more jobs.

Conference

KCDC 2025

When I first started attending conferences, I diligently tried to write down notes and publish them. It forced me to actively listen to the talks I was attending. With the number of conferences rising, I couldn’t keep the rhythm. When I switched my career path to Developer Advocate, I drastically diminished the number of talks I attended in favor of the hallway track. As a result, the last conference 'report' I wrote was JPrime’s in 2022.

Technical

OpenTelemetry configuration gotchas

Last week, I described several approaches to OpenTelemetry on the JVM, their requirements, and their different results. This week, I want to highlight several gotchas found across stacks in the zero-code instrumentation. The promise of OpenTelemetry Since its inception, OpenTelemetry has unified the 3 pillars of observability. In the distributed tracing space, it replaced proprietary protocols Zipkin and Jaeger.

Technical

OpenTelemetry Tracing on the JVM

You may know I’m a big fan of OpenTelemetry. I recently finished developing a master class for the YOW! conference at the end of the year. During development, I noticed massive differences in configuration and results across programming languages. Even worse, differences exist across frameworks inside the same programming language.

Technical

Git default options

Git has become a fundamental part of our developers' daily routine that it’s hard to remember our lives without it. And yet, most of us use a limited set of commands and options. Today, I want to focus on two commands most developers probably use every day and look at the defaults behind them. git push After git commit, git push is probably the second most used command.

Nicolas Fränkel's blog