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Kerem Kat

PROFILE

Kerem Kat

Worked on JVM stability and memory management in the corretto/corretto-8 and corretto/corretto-11 repositories, focusing on low-level bug fixes in C++ and Java. Addressed a race condition in JVMTI dynamic code generation event posting by introducing thread state and event collector checks, along with regression tests to ensure ongoing reliability. Improved JNI lifecycle handling by moving jmethod_id cleanup to the class unload phase, aligning with JNI specifications and reducing native code risks. Demonstrated expertise in concurrency, JNI, and JVM internals, with a methodical approach to testing and code integration that enhanced runtime reliability and prevented production incidents.

Overall Statistics

Feature vs Bugs

0%Features

Repository Contributions

2Total
Bugs
2
Commits
2
Features
0
Lines of code
241
Activity Months2

Your Network

1688 people

Work History

September 2025

1 Commits

Sep 1, 2025

September 2025 monthly summary for corretto/corretto-8 focusing on stability, quality, and measurable business value. Implemented a fix for a race condition in JVMTI dynamic_code_generated event posting that could crash the JVM, guarded against null thread state and null event collector when switching concurrent event notification modes, and added regression tests to prevent future regressions. These changes improve runtime reliability for dynamic code generation scenarios and reduce risk of production incidents.

December 2024

1 Commits

Dec 1, 2024

Monthly summary for 2024-12 focused on corretto/corretto-11: Delivered a crucial JNI lifecycle cleanup by moving the clearing of jmethod_ids to ClassLoaderData::unload, ensuring cleanup occurs at unload time and preventing use-after-unload scenarios in native code. This change aligns with JNI specifications and reduces the risk of native code crashes related to stale method IDs. The work integrates cleanly with the unload lifecycle and is backed by a focused commit.

Activity

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Quality Metrics

Correctness95.0%
Maintainability80.0%
Architecture80.0%
Performance70.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++JavaShell

Technical Skills

ConcurrencyJNIJVM InternalsJVMTILow-level programmingMemory ManagementTesting

Repositories Contributed To

2 repos

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

corretto/corretto-11

Dec 2024 Dec 2024
1 Month active

Languages Used

C++

Technical Skills

JNIJVM InternalsMemory Management

corretto/corretto-8

Sep 2025 Sep 2025
1 Month active

Languages Used

C++JavaShell

Technical Skills

ConcurrencyJVMTILow-level programmingTesting