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Michal Karm Babacek

PROFILE

Michal Karm Babacek

Karm worked on stability and compatibility improvements across openjdk/jdk-sandbox and quarkusio/quarkus-quickstarts. In openjdk/jdk-sandbox, he enhanced error handling for Java AWT in headless mode by introducing a CHECK_EXCEPTION_FATAL macro in native JNI code, ensuring fatal exceptions are properly reported and tested. He also modernized test infrastructure by migrating class file transformation logic from ASM to the java.lang.classfile API, resolving CI issues and aligning with current Java standards. In quarkusio/quarkus-quickstarts, Karm migrated the Native Micro Dockerfile to UBI9, updating dependencies and ensuring Docker builds run reliably on newer container environments using Java and Dockerfile.

Overall Statistics

Feature vs Bugs

33%Features

Repository Contributions

3Total
Bugs
2
Commits
3
Features
1
Lines of code
253
Activity Months3

Work History

August 2025

1 Commits • 1 Features

Aug 1, 2025

In August 2025, completed the UBI9 migration for the Native Micro Dockerfile in the quarkusio/quarkus-quickstarts repository, ensuring compatibility with the latest base image and required libraries. This enables builds and runtime on UBI9 environments and reduces deployment risk as teams move to newer hosting stacks.

March 2025

1 Commits

Mar 1, 2025

For 2025-03, focused on stabilizing headless tests in the openjdk/jdk-sandbox project and aligning test infrastructure with current Java APIs. Implemented a fix for HeadlessMalfunctionTest by updating the agent's class file transformation logic and migrating from a deprecated ASM-based approach to the java.lang.classfile API to modify the GraphicsEnvironment class. The test now correctly verifies the expected error message when isHeadless is removed, addressing a CI compilation error and restoring test reliability.

January 2025

1 Commits

Jan 1, 2025

January 2025: In openjdk/jdk-sandbox, delivered a targeted fix to improve error reporting during AWT library loading in headless mode. Introduced a new macro CHECK_EXCEPTION_FATAL to robustly propagate fatal Java exceptions from native code during class/method lookups, increasing reliability and debuggability in headless environments. Added tests to verify the improved error handling. The change enhances stability for headless deployments and improves observability of native error paths, contributing to faster issue diagnosis and reduced risk of silent failures.

Activity

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Quality Metrics

Correctness90.0%
Maintainability80.0%
Architecture80.0%
Performance63.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

CDockerfileJava

Technical Skills

Agent DevelopmentBuild SystemsContainerizationDevOpsError HandlingJNIJavaJava AWTNative Code DevelopmentTesting

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

openjdk/jdk-sandbox

Jan 2025 Mar 2025
2 Months active

Languages Used

CJava

Technical Skills

Error HandlingJNIJava AWTNative Code DevelopmentTestingAgent Development

quarkusio/quarkus-quickstarts

Aug 2025 Aug 2025
1 Month active

Languages Used

Dockerfile

Technical Skills

ContainerizationDevOps

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