René Schwietzke

CEO and co-founder of Xceptance. René has served as Xceptance’s Managing Director since 2004 including the continuous evaluation and development of test tools and services. He holds a Master’s degree in Computer Science from Brandenburg University of Technology, Germany.

He has been working with Java since version 1.0. While working with and for two ecommerce and one quality assurance company, he gained plenty of insides into Java, performance tuning, and performance measurements that includes but is not limited to JIT, GC, and the JMM.

René regularly gives talks and training about programming in Java, GC and memory management, as well as testing and quality assurance.

Jakarta EE 11: Beyond the Era of Java EE

This user guide provides a brief history of Java EE/Jakarta EE and a detailed overview of some of the specifications that will be updated in Jakarta EE 11.

Stable, Secure, and Affordable Java

Azul Platform Core is the #1 Oracle Java alternative, offering OpenJDK support for more versions (including Java 6 & 7) and more configurations for the greatest business value and lowest TCO.

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Step up your coding with the Continuous Feedback Udemy Course: Additional coupons are available

What do you know about the code changes that were just introduced into the codebase? When will you notice if something goes wrong?

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The Curious Case of Different Runtimes

Strange runtime behavior when presenting different training data to the JIT. We show how we diagnosed and condense down to a few test cases.

Jun 30 3,4K

René Schwietzke

Performance

Use Cases

Retweet on Twitter Foojay.io Retweeted

The hottest #Java unconference in the world is coming back 27-31 July 2026 (starting evening of 26th). Deep discussions about Java and life. We are making some seats available using a lottery system. Draw will be on Friday the 20th Feb. Sign up here: https://www.jcrete.org/lottery

08:45 PM · February 09, 2026

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Confession: I usually lose the Flow switching between Quality Gates and Code 📉😅

But I connected @claudeai + #SonarQube via #MCP

Verify & Fix vulnerabilities without touching the mouse.
Zero context switching. Pure flow. 🚀

https://foojay.io/today/claude-code-sonarqube-mcp/

#Java #AI @foojayio

03:56 PM · February 02, 2026

Retweet on Twitter Foojay.io Retweeted

Hola Java devs! 👋 The #SonarQube AI Code Assurance #article is LIVE on @foojayio ! 🎉

Stop just finding bugs. 🛑 Use SonarQube's new AI "Magic Button" to auto-fix them instantly! 🤯🪄

Crush that tech debt fast. 🚀☕️ #Java #AI @SonarSource

https://foojay.io/today/sonarqube-part-4-ai-code-assurance/

04:44 PM · January 19, 2026