BAbafe·Sep 26, 2023
This design note could be of interest: https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...
In JEP 457: Class-File API for Parsing, generating, transforming Java classfilesopenjdk
amber-docs
HTML2020–2024
openjdk / amber-docs
amber-docs
https://openjdk.org/projects/amber
16Distinct people
26Mentions
0Explicit recommenders
146GitHub stars
What to know before exploring
What it is
https://openjdk.org/projects/amber
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 5:58:02 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 year26 dated mentions
Observed mentions: 2020-08-18 00:06:08 UTC to 2024-01-13 21:17:08 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 |
|---|---|---|---|---|---|
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 3 | 2 | 1 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 15 | 6 | 9 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 6 | 0 | 6 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
6 sourcesHave you seen the whole plan? https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...
In Java 21: What’s New?https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...
This is the vague plan.
In JDK 20 G1/Parallel/Serial GC ChangesTrue, but that only pushes the question of value down the line.
I'm curious about lenses because Java did have a serious problem that required a solution: working with "simple" data correctly was difficult. The chosen solution was ADTs, so we did buy into that. But the approach being explored for transforming records (https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...) only works one level at a time rather than for an entire path. So I wonder how valuable it would be to have a solution for paths. If the answer is that it's mostly valuable for an approach we haven't bought into yet, then we might not need to consider it just yet.
In Making Lenses Practical in JavaOr just stop trying to force immutability into something that is clearly mutable. You’re only causing unnecessary GC pressure by copying objects.
Never the less this eerily looks similar to Goetz proposal for reconstructors:
https://github.com/openjdk/amber-docs/blob/master/eg-drafts/...
In Making Lenses Practical in Java