MUmurkle·Oct 15, 2025Submission
Compile Javac into a WASM Module
2 points · Open discussiongraalvm
graalvm-demos
Java2019–2025
graalvm / graalvm-demos
graalvm-demos
This repository contains example applications to illustrate the different capabilities of GraalVM
3Distinct people
5Mentions
0Explicit recommenders
683GitHub stars
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This repository contains example applications to illustrate the different capabilities of GraalVM
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.
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HN mentions by year5 dated mentions
Observed mentions: 2019-10-18 11:48:29 UTC to 2025-10-15 09:19:31 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 |
|---|---|---|---|---|---|
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 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 | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
5 sourcesCurrently, you'd use the polyglot package that ships with the GraalVM SDK:
https://www.graalvm.org/sdk/javadoc/org/graalvm/polyglot/Con...
Here are a couple of demos:
https://github.com/graalvm/graalvm-demos
I said "currently", because you currently have to use the host Java, that is the Java on top of which all other languages are implemented. The GraalVM team is working on Project Espresso, a Java written in Truffle. That will make polyglot programming with Java much more consistent with the rest of the languages. Project Espresso isn't public yet, but here's the latest update from the team working on it:
https://github.com/oracle/graal/issues/1656#issuecomment-664...
In GraalVMYou can do this with GraalVM. Here's an example:
https://github.com/graalvm/graalvm-demos/tree/master/polyglo...
And here's a polyglot notebook example:
https://fniephaus.com/2019/px19-polyglot-notebooks.pdf
And finally, here's our GraalVM-powered Jupyter kernel:
https://github.com/hpi-swa/ipolyglot
In Writing a Polyglot ScriptWith Graal AOT you can make command line utilities that start on the order of 0.008s
https://github.com/graalvm/graalvm-demos/tree/master/java-ko...
In Bazel 1.0Java Hello World takes 0.132s on my Macbook pro. If I turn on -Xshare:on to use class data sharing, then it drops to 0.119s. Ergo, Java startup time is non-factor. Graal could make this even quicker, for example, a GraalVM AOT helloworld can be reduced to .008s startup, see https://github.com/graalvm/graalvm-demos/tree/master/java-ko... for example.
"time bazel" returns 0.098s
Running a null build took 0.84s, but Bazel does significantly more work, as it's working on a big monorepo, as both a build tool and a package manager.
In short, it is not a problem. But I've had npm take many many seconds for simple operations. "npm list" takes 2.9 seconds.
Python can be slow, depending on the tool. Waf sounds like it is simple and fast, but there are lots of other examples of slow python frameworks out there.
In Bazel 1.0