
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.

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.
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.
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.
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: 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.
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.
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