Matheus Oliveira

"Show me the code" is a trap if you think code shows itself. Pushing to GitHub in silence won't get you noticed. ​Even Linus Torvalds doesn't build alone. He communicates. ​Write about it. Talk about it. When was the last time you truly showed your code? 💻🚀

Stop overthinking your next Open Source contribution. ​You’re an experienced dev. You know Git, you know how to fork. You’re just afraid of a "change request". ​Dive into the muddy waters. Fool Around and Find Out. ​Comment the target date for your next PR below 👇

order.persist() instead of repository.save(). Active Record in Quarkus Panache. One class per entity. No repository. Then Hibernate Reactive for Uni<T> + @WithTransaction. blog.omatheusmesmo.dev/en/posts/panac…

This week ... Spring, Quarkus, and Friends: Pick Your Character with @cat_edelveis #quarkusclub m.youtube.com/watch?v=ER2eeA…

14 conversations. 14 Java Champions. One masterclass on tech and career growth. ☕️🚀 My "Asking a Java Champion" series is officially a go-to resource for anyone looking to level up. From technical mastery to leadership, it’s all here. 🎬 Check the full collection: youtube.com/playlist?list=… #Java #TechCommunity

@maxandersen I love reading the Zulip thread about it.

Been working on picocli to aesh migration the last few weeks for JBang. The startup difference is amazing - 2-17x faster. JVM mode is now amazing but native mode is even faster lesson learned again and again - reflection is a startup killer; build-time makes all the difference

Want to see what your AI is actually thinking? 🤔 My latest Quarkus LangChain4j PR adds the @ OnThinking annotation! Now you can intercept AI thoughts (DeepSeek, Claude) for logs, audits, and redaction. 🧠🔥 Watch how it works 👉 youtu.be/L5XmvpVQ-yM #Quarkus #AI #Java #oss

"Share your goal for the year." My mentor @lgsreal challenged me, so I grabbed the mic and told 100 people at JUG SouJava my dream: becoming a committer for a major Quarkus extension. 🚀 Now I have 100 witnesses holding me accountable. When did you last put skin in the game? 👇

@lgsreal Great day!

Nearly 100 devs packed Oracle SP for the last SouJava meetup! ☕️🚀 The highlights: 🔹 Prof. Isidro: OpenClaw in Java. 🔹 Matheus Cruz: Quarkus Flow & AI. 🔹 Beatriz Souza: Java for Women (WoHackers). Great talks, but the networking was the real magic. Join the community: discord.soujava.org.br #Java #SouJava #AI #Oracle #DevCommunity

Before: one EmbeddingStore per provider in Quarkus LangChain4j. Now: named stores with @EmbeddingStoreName. Each store gets its own datasource. Inject by name. Currently pgvector, Milvus, Redis, Chroma, Neo4j. More in progress. github.com/quarkiverse/qu…

Quarkus Agent MCP is a standalone MCP server that lets AI coding agents create, manage, and work effectively with Quarkus applications. Extension authors can ship coding skills that agents pick up automatically. Learn more in Phillip Krüger's post: buff.ly/YRRSD42

@tambouidev Cool!

TamboUI 0.3 is out! Markdown viewer with streaming, unicode and bracketed paste support, even crispier images and more. See github.com/tamboui/tambou…

I’ve become one of the top 20 contributors to Quarkus LangChain4J. 'Thus far the Lord has helped us.' ​#Quarkus #LangChain4j #Java #OpenSource #SoftwareEngineering #TechCommunity

Anyone can set your name and email in Git. That won't let them push to your repo. What matters is a token: a random string GitHub generates when you create a PAT or authorize via OAuth. Your credential helper stores it and sends it on every push. No token = 403. 🤔

Panache Repository: no interface, no proxy, no magic. A concrete class with @ApplicationScoped. persist() returns void. findByIdOptional() gives Optional. Dev Services spins up PostgreSQL in Docker. Zero config. Full guide: blog.omatheusmesmo.dev/en/posts/persi…

"Do or do not. There is no try." - Yoda That's also how I approach coding. No "I'll try to ship it." Just ship it. Here's a single-file Java program that puts Yoda in your terminal: jbang gist.github.com/omatheusmesmo/… #May4thCollabTimeSouJava

SouJava is taking over Oracle SP on 13/05 at 18:30! ☕🚀 Lineup includes Professor Isidro (Agentic AI), Beatriz Souza (Women in tech), and Matheus Cruz (Quarkus Flow). Don't miss Brazil's largest Java community gathering! Register: souj.org/mai26 #Java #SouJava #Meetup #Oracle

Internships often ask for experience because seniors don’t have as much time to mentor as before. Be mentored by AI, and master the fundamentals now. No job? Build a system for a local business—for free. It’s important to be able to say you have experience, because other companies will trust you more. #JuniorDev #Java #JavaIntern

Code review in open source is a free masterclass. No sprints. No deadlines. Your PR stays open until it meets a high standard. Experienced engineers point out better approaches, edge cases, patterns you didn't know. Most devs never get this at work. In OS, review IS education.