Election for Nazim Bhuiyan as Committer on Eclipse OpenJ9

Details

Nominee

Nazim Bhuiyan

Project

Eclipse OpenJ9

Role Type

Committer

Criteria

Nazim Bhuiyan has been an active contributor to the Eclipse OpenJ9 project since 2018.

Nazim is the foremost expert in the JIT method inliner optimization, which is arguably the most influential JIT optimization in OpenJ9 due to its direct effect on performance and by enabling opportunities for other optimizations. The inliner is a complex component due to its heuristic policies and inlining mechanics. Nazim has investigated a number of Java performance issues over the years that resulted in changes to the inlining heuristics to catch or filter opportunities, all while not regressing existing performance (which is always a challenge with heuristic-based optimizations). In addition to developing a deep understanding of its internals and operations, Nazim has made significant progress over the past few years to make the code more understandable for others, maintainable, and reducing technical debt. For example, earlier this year, Nazim prepared and delivered a deep dive talk titled "Demystifying the OpenJ9 JIT Inliner" [1] for the OpenJ9 community.

Nazim has also made significant contributions to support OpenJDK Lambdaforms in OpenJ9, primarily in the JIT component. This is a large undertaking to replace the bespoke OpenJ9 MethodHandle implementation (which has a number of maintenance and performance shortcomings) and standardize it with the technology developed in the OpenJDK class library. Achieving good MethodHandle performance is largely a method inlining exercise, and Nazim has leveraged his deep skills in the JIT inliner to deliver steady improvements to make this migration successful. Noteworthy pull requests include:

* Laying the groundwork for OpenJDK MH support [2]
* VarHandle inlining support [3]
* Inlining improvements related to VarHandles/Foreign Memory [4]
* Inliner improvements for new java/lang/reflect implementation using MethodHandles (JDK21+) [5][6]

Because MethodHandle usage is growing in recent JDK levels, there has been an increase in the number of performance problems attributed to that usage. Nazim is often the JIT person triaging those issues and understanding how best to resolve them. For example, he recently implemented several changes for MethodHandles in order to pass down the known object/type information needed to optimize past the VarHandle chains, as well as work to improve MethodHandle.invokeBasic and MethodHandle.linkTo* performance [7].

To improve developer awareness of the Lambdaform Method Handle implementation in OpenJ9 and to share his diagnostic best practices with others, Nazim co-authored and delivered a pair of presentations for the OpenJ9 community [8][9].

Nazim was also responsible for the initial port of the JIT to Intel macOS, which was a critical component to deliver OpenJ9 support on macOS. Most of this work was in the JIT runtime (written in assembly), and involved evaluating different alternatives for supporting the runtime on different x86 operating systems with different tool chains with minimal effort. Nazim ultimately consolidated the runtime code to use the Netwide Assembler (NASM) so the same code could build unmodified on Linux, Windows, and macOS with a single toolchain [10].

To date, Nazim has authored more than 100 pull requests in OpenJ9 [11] and has demonstrated thoroughness in his implementation and quality assurance of each of those contributions. He has also formally reviewed 15 pull requests [12] and has been indirectly involved in shaping many others.

For these reasons, I strongly believe Nazim Bhuiyan is highly deserving of committer status for the Eclipse OpenJ9 project.

Nominated by

Daryl Maier

Date

Wed, 05/13/2026 - 12:00 - Wed, 05/20/2026 - 12:00

Status

This election is in progress with 9 positive, 0 negative, and 0 neutral votes (29 eligible voters).

Voter	Vote	Comments
Daryl Maier	+1	+1 implied by nomination
Adam Brousseau	+1	Well deserved, congrats!
Vijay Sundaresan	+1	I strongly support Nazim's nomination. I have seen his excellent work and attention to detail in the inlining and method handles work.
Rahil Shah	+1	I agree with the nomination given the great contribution from Nazim in OpenJ9.
Mark Stoodley	+1	strongly support
Babneet Singh	+1	Strongly support. Nazim has made solid technical contributions to OpenJ9 and has consistently shown good collaboration and ownership.
Henry Zongaro	+1	Nazim's expertise in inlining and method handles have already made him a valued contributor. I strongly support his election as a committer.
Devin Papineau	+1
Kazuhiro Konno	+1