VIvips7L·Jul 1, 2025
One day we’ll get nullable types: https://openjdk.org/jeps/8303099
I believe I read on the mailing list it’s implemented here: https://github.com/openjdk/valhalla/tree/lw5
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valhalla
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openjdk / valhalla
valhalla
https://openjdk.org/projects/valhalla
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| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
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| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 2 | 1 | 1 |
| 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 | 0 | 0 | 0 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 1 | 0 | 1 |
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6 sourcesStill a branch, I think. https://github.com/openjdk/valhalla
Not sure if there is any relevant reason for this to be posted at this particular point in time. The most recent early-access build is from 2022: https://jdk.java.net/valhalla/
Edit: regarding replies about the recent update date -- that update date is tied to the linked Jira issue (https://bugs.openjdk.org/browse/JDK-8251554) and the only activity four days ago was adding links to some related issues. There were some updates to the description two months ago but the History view makes it difficult to determine what those are without manually copy-and-pasting the old revisions into some sort of diff tool
In JEP 401: Value Classes and Objects (Preview)Optional is being being converted to a value class as part of Project Valhalla.
I reran the benchmarks with the latest Valhalla branch [1] and added a test that used OptionalLong instead of Optional<Long>.
Without Valhalla
- OptionBenchmark.sumSimple avgt 5 328,110 us/op
- OptionBenchmark.sumNulls avgt 5 570,800 us/op
- OptionBenchmark.sumOptional avgt 5 2223,887 us/op
- OptionBenchmark.sumOptionalLong avgt 5 1201,987 us/op
With Valhalla
- OptionBenchmark.sumSimpleValhalla avgt 5 327,927 us/op
- OptionBenchmark.sumNullsValhalla avgt 5 584,967 us/op
- OptionBenchmark.sumOptionalValhalla avgt 5 572,833 us/op
- OptionBenchmark.sumOptionalLongValhalla avgt 5 326,949
Read the rest
us/op
OptionalLong is now as fast as simple sum. And SumOptional is now as fast as SumNulls. So the overhead of using OptionalLong and Optional<Long> seems to have gone away with Valhalla.
It would be great if boxing could be eliminated as well. But few people writes code like what is being benchmarked (in hot loops) in practice.
[1] https://github.com/openjdk/valhalla
It's being actively worked on [1, 2].
[1] https://github.com/openjdk/valhalla/
[2] https://mail.openjdk.java.net/pipermail/valhalla-dev/
In How much faster is Java 17?> Project Valhalla is trying to add proper value types to the JVM, but sadly as of today the project seems a bit abandoned...
The repo seems to have very recent activity, has commits from today! https://github.com/openjdk/valhalla
In Graphics for JVMValhalla's lworld branch is now available on GitHub
1 points · Open discussion