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Fixrleak: Fixing Java Resource Leaks with GenAI

https://www.uber.com/blog/fixrleak-fixing-java-resource-leaks-with-genai/
17•carimura•1y ago

Comments

stevoski•1y ago
> “Resource leaks, where resources like files, database connections, or streams aren’t properly released after use, are a persistent issue in Java applications”

This was true maybe back in 2005. Java has had try-with-resources for a loooong time. As I see it this has been the dominant idiom for ages, for handling resources that might leak.

okr•1y ago
People tend to forget. Stream-API is a good candidate, that people like to not consider for leakage. If you don't own your stream, if you do not definitly know, that your stream comes from a collection, then ya better close it with a try-block.
bob778•1y ago
How much effort was spent automating this to fix 112 instances across Uber’s code base? I assume code reviews would catch any new issues so this seems like overkill for a small one-off task?
hawk_•1y ago
Spotbugs or checkstyle etc... would catch these. What does AI add here?
xyst•1y ago
It gives marketing team at Uber to say "wE uSe AI hErE!!1". C-levels approve since anything AI gets a nice pump.

Engineering wise. This adds nothing. It’s an absolute waste of compute and energy to run this through LLMs

sigotirandolas•1y ago
> This analysis ensures that FixrLeak skips functions where resources are passed as parameters, returned, or stored in fields, as these resources often outlive the function’s scope.

> FixrLeak delivers precise, reliable fixes while leaving more complex cases for advanced analysis at the caller level.

In other words, this will only fix trivial leaks, which are best seen as a language design issue and can be fixed by RAII, reference counting, etc.

It won't fix the more insidious leaks like `UNBOUNDED_QUEUE.add(item)` that are more likely to pass through code review in the first place.

xyst•1y ago
Using AI when a static scanner like SonarQube easily picks up these types of resource leaks, especially in Java.

Peak waste.

What’s next?

"Get rid of your GitHub dependabot alerts and replace it with my shitty ChatGPT wrapper”

rvz•1y ago
> Using AI when a static scanner like SonarQube easily picks up these types of resource leaks, especially in Java.

Exactly.

It's very disappointing to see that Uber engineers would rather trust an LLM to that claims to spot these issues when a battle-tested scanner such as SonarQube would have caught this in the first place.

The LLM hype-train is almost just as bad as the JavaScript hype train in the 2010s where some of the worst technologies are used on everything.

rvz•1y ago
Why exactly do you need LLMs for this when efficient alternatives like SonarQube or checkstyle already do this without the expensive waste LLMs create?

This adds little to no technical advantage over existing solutions what so ever for this particular use case.

yahoozoo•1y ago
stupid af
Traubenfuchs•1y ago
So you tell me those 200-600k software engineers that can easily solve leetcode hard are so incompetent they missed using try-with-resources at such scale, they needed to introduce new AI tooling to fix it?

Hey Uber, I am from the EU, I usually can‘t even solve leetcode medium but I will write you scalable, spotless Java for a third of the salary.

Our industry and its economics are a joke.

hello_moto•1y ago
So you write bug-free scalable code 100% in any jobs you ever worked for?

I guess we don’t need QA and Dev/Staging environment

rad_gruchalski•1y ago
Can the QA team? How does the dev/staging environment help writing less buggy code?
rad_gruchalski•1y ago
But can you leetcode heh.
TYMorningCoffee•1y ago
A lot of commenters point out that there already are many established static checkers that do this. That is not what Uber attempts here.

Uber is not proposing a static checker. They even use sonar qube in their architecture. They propose using an LLM to resolve the leak detected by sonar qube.

Bug Blindness

https://danluu.com/bug-blind/
197•davidmckenna•7h ago•92 comments

RISC-V is now officially supported by CPython

https://blog.python.org/2026/08/riscv-now-officially-supported/
113•lumpa•5d ago•21 comments

Hy4 preview

https://www.tencent.com/tencent-releases-and-open-sources-tencent-hy4-preview/
264•shenli3514•11h ago•164 comments

FreeCORE TrueNAS Core – Continued

https://freecore.org/
78•sashk•5h ago•48 comments

California lawmakers unanimously pass Linux exemption from age-verification law

https://www.tomshardware.com/software/linux/california-lawmakers-unanimously-pass-linux-exemption...
163•shscs911•4h ago•34 comments

Creating Teensy ELF Executables for Linux (Or, "Size Is Everything")

https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
35•Bluestein•4d ago•6 comments

Benjamin Franklin's Alter Egos Gave Him the Most Freedom

https://www.smithsonianmag.com/history/among-all-great-things-benjamin-franklin-invented-discover...
44•cisc•6h ago•12 comments

Benchmarking Pocket-Scale Inference

https://artificialanalysis.ai/hardware-inference-stack/mobile-phones
34•sys42590•2d ago•2 comments

Tether: iMessage, SMS, etc. on Linux

https://zackbartel.com/blog/2026/08/tether/
437•zackb•6d ago•172 comments

Nancy Grace Roman Space Telescope

https://science.nasa.gov/mission/roman-space-telescope/
181•JumpCrisscross•15h ago•71 comments

Lawmakers added $1 to car insurance policies. That money paid for Flock cameras

https://www.texastribune.org/2026/08/28/texas-flock-cameras-auto-insurance-fee-mvcpa-grants/
258•DeepLogin•8h ago•135 comments

The Rise and Fall of Agent Civilizations

https://www.dwarkesh.com/p/openai-huggingface
56•consumer451•7h ago•20 comments

SQLite as a Document Database (2020)

https://dgl.cx/2020/06/sqlite-json-support
197•lioeters•5d ago•48 comments

Is it safe to call print in a Python signal handler?

https://iafisher.com/2026/08/sigprint
38•hellerve•3d ago•20 comments

Open Oscar Server: open-source server compatible with AIM and ICQ clients

https://github.com/mk6i/open-oscar-server
26•gregsadetsky•6h ago•9 comments

Show HN: I missed the moving blocks, so I built a real Linux disk defragmenter

https://github.com/gbin/defragger
52•gbin•4d ago•38 comments

Functional State Machines in Rust: Typestate and Newtype Patterns

https://dl.acm.org/doi/10.1145/3830438.3830958
77•matt_d•12h ago•32 comments

EVE Online moves to Python 3

https://www.eveonline.com/news/view/the-move-to-python-3-begins
337•TylerJaacks•4d ago•183 comments

Glacier Mice

https://en.wikipedia.org/wiki/Glacier_mice
284•ostacke•5d ago•55 comments

Algorithmic rent-pricing litigation expands under new state and local laws

https://www.morganlewis.com/pubs/2026/08/algorithmic-rent-pricing-litigation-expands-under-new-st...
67•toomuchtodo•4h ago•34 comments

Calibrate Before You Accelerate: Bias Toward Action in a New Role

https://tucker.wales/writing/bias-towards-action/
145•tuckerwales•13h ago•55 comments

A few feral cats in an ALGOL trenchcoat.

https://wiki.xxiivv.com/site/pop2.html
12•bmacho•1d ago•1 comments

Daycare Pseudoscience

https://worksinprogress.co/issue/daycare-pseudoscience/
27•surprisetalk•1d ago•4 comments

Domain-Driven Agents

https://coldtake.dev/blog/domain-driven-agents
74•AlarQ•11h ago•16 comments

Samsung's Processing-in-Memory (PIM)

https://chipsandcheese.com/p/hot-chips-2026-samsungs-processing
257•ingve•1d ago•99 comments

Good Culture Is the Biggest Productivity Hack, Not AI

https://newsletter.eng-leadership.com/p/good-culture-is-the-biggest-productivity
356•gpi•14h ago•80 comments

Boot a Virtual iPhone via Apple's Virtualization.framework

https://github.com/Lakr233/vphone-cli
399•hentrep•1d ago•106 comments

DHS is using obscure law to snoop on journalists, non-profits, unions

https://www.theguardian.com/us-news/2026/aug/29/trump-dhs-1509-summons-records-journalists-nonpro...
387•firefax•12h ago•77 comments

Recovering Corrupt Zip Files

https://www.construct.net/en/blogs/ashleys-blog-2/recovering-corrupt-zip-files-1895
55•AshleysBrain•3d ago•26 comments

Trees for a Changing Climate and Resilient Urban Forest (2022)

https://www.coolboulder.org/news/trees-for-a-changing-climate-resilient-urban-forest
50•mooreds•14h ago•8 comments