APapta·Aug 18, 2020
A couple of options for handling nulls:
* https://checkerframework.org/
* https://github.com/uber/NullAway
In Kotlin 1.4uber
NullAway
Java2017–2024
uber / NullAway
NullAway
A tool to help eliminate NullPointerExceptions (NPEs) in your Java code with low build-time overhead
11Distinct people
14Mentions
0Explicit recommenders
4.1KGitHub stars
What to know before exploring
What it is
A tool to help eliminate NullPointerExceptions (NPEs) in your Java code with low build-time overhead
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
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Also in these discussions
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This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 10:02:05 AM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year14 dated mentions
Observed mentions: 2017-10-30 02:10:20 UTC to 2024-08-02 09:38:14 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 2 | 0 | 2 |
What Hacker News says
3 sourcesHow are they making it worse?
In any case, there already exist solutions in place:
https://checkerframework.org/manual/#example-use
https://github.com/uber/NullAway
In The Next Step for Generics> The way Uber brands them suggests that they're suitable for use in production environments, but so far that hasn't been the case with anything they open sourced outside a narrow envelope that resembles their own operating model.
Not a contradiction. Many of these tools are suitable for use in production, almost by definition, since they are being used in production, at Uber. They might or might not work in your environment out of the box. But they are certainly often likely a better starting point than an empty editor, even when they do not. Most of the ones I am familiar with, are happy to get PRs generalizing them to more varied environments.
> they're nothing more than interesting repos amongst a sea of interesting repos.
As someone who has open-sourced on GitHub: research prototypes hacked together for a research paper deadline in g
Read the rest
rad school, class projects, for-fun hacks, and also production tooling I built as a paid engineer, I'd say there is a big difference! :) And there would still be a big difference even if the later were somehow never touched again after the first "we are open-sourcing this!" commit.
That said, we do try to maintain the things we open-source. Standards of support vary because individuals maintaining these projects, and their situations, vary. This is true for non-OSS internal tools too. In my experience, having gone through the Uber OSS process twice, and having started it a third time and decided against releasing (yet?), Uber does try to make reasonably sure that it's open-sourcing stuff that will be useful and is planned to be maintained. At the same time, they have to balance it with making it easy to open-source tools, otherwise too many useful things would remain internal only.
Also, note, some of these tools have exactly one developer internally as the maintainer, and not even as their full time job. For example, I am the sole internal maintainer[1] for https://github.com/uber/NullAway and also have 3-4 other projects internally on my plate, most of which are in earlier stages and need more frequent attention[2]. If and when said developer leaves, effort is made to find a new owner. This is not always successful, particularly if the tool has become non-critical internally. Sometimes, leaving owners retain admin rights on the repos and keep working on the tool (Manu, NullAway's original author, co-maintains it), but I don't think anyone is suggesting that that should be an obligation.
Finally, obviously, nothing here is the official Uber position on anything, just my own personal observations. This doesn't represent my employer, and so on. I am also pretty sure most of this is not even Uber specific :)
[1] Not the only internal contributor! Also, there is one external maintainer, as mentioned a few sentences later. But in terms of this being anyone's actual responsibility...
[2] Just to clarify, I think between Manu's interest, my own, and it being relatively critical tooling at Uber, NullAway is pretty well maintained. But I can understand why that isn't always a given for all projects.