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Adds a Java binding (`bindings/java`) over the C ABI hub — the fourth language stecker after C#, Go and R, reaching the hub through the Java Foreign Function & Memory API (Panama, `java.lang.foreign`, final in Java 22) rather than JNI or jextract. ## What's here - **`bindings/java`** — a Maven module (`org.wickra:wickra`) exposing all 514 indicators as idiomatic `AutoCloseable` classes. The downcall handles (`internal/NativeMethods.java`), the per-indicator wrappers and the output records are generated from `bindings/c/include/wickra.h` (same eight-archetype taxonomy as the C#/Go/R generators: scalar/batch, multi-output, bars, profile, values-profile, array-input). The opaque handle is a `MemorySegment` freed by a registered `java.lang.ref.Cleaner` action; multi-output returns a `record` (`null` at warmup), bars a `record[]`, profiles a record with a trailing `double[]`. The hand-written `WickraNative` resolves the native library (a bundled per-platform copy, or a `target/release` fallback for local development) and validates it against a sentinel symbol. repr(C) struct offsets are computed in the generator so the FFM reads land on the exact bytes. - **`examples/java`** — the full example suite mirroring C/C#/Go/R: streaming, backtest, multi_timeframe, parallel_assets (parallel streams), three strategies, and `FetchBtcusdt`/`LiveBinance`. - **CI** — a `java` job builds the C ABI library, sets up JDK 22 (Temurin, with a CDN-flake retry), runs the archetype test suite and the seven offline examples on Linux, macOS and Windows. - **Release** — a gated `java-publish` job (skipped until the `JAVA_PUBLISH_ENABLED` repository variable is set) stages the native libraries from the `wickra-c-<triple>.tar.gz` assets into the binding's resources and deploys to Maven Central with GPG signing. Independent of the GitHub-release job, like the NuGet job. - **Docs** — Java added to the README languages table, project layout, building/testing and comparison table, CONTRIBUTING, ARCHITECTURE, the examples index, the issue/PR templates, the About-description template, and the other binding READMEs. ## Requirements Java 22+ (the FFM API is final since Java 22). The binding requires `--enable-native-access=ALL-UNNAMED` at runtime; the test and example runners pass it automatically. No Rust crate or `Cargo.toml` change — the Java binding is standalone and additive. The generated `*.java` are committed (like the node `index.js`/`index.d.ts`); the generator stays private.
62 lines
1.6 KiB
Markdown
62 lines
1.6 KiB
Markdown
---
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name: Bug report (Detailed)
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about: Long-form bug report with environment matrix, minimal reproducer, and expected-vs-actual sections.
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title: "[Bug] <short description>"
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labels: ["bug", "triage"]
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assignees: []
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---
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## Summary
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<!-- One or two sentences. What did you expect, what happened instead? -->
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## Affected binding
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- [ ] Rust crate (`wickra`)
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- [ ] Python (`pip install wickra`)
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- [ ] Node.js (`npm install wickra`)
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- [ ] WebAssembly
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- [ ] C ABI (`bindings/c`)
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- [ ] C# / .NET (`Wickra` on NuGet)
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- [ ] Go (`bindings/go`)
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- [ ] Java (`org.wickra:wickra` on Maven Central)
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- [ ] R (`bindings/r`)
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- [ ] Docs / examples only
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## Environment
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| Field | Value |
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| -------------------- | -------------------------------------- |
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| Wickra version | `e.g. 0.4.2` |
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| Binding version | `e.g. python 0.4.2 / node 0.4.2` |
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| OS / arch | `e.g. Windows 11 x86_64, Linux glibc` |
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| Rust toolchain | `rustc --version` (If building from source) |
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| Python / Node / .NET version | `python --version` / `node --version` / `dotnet --version` |
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## Minimal reproducer
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<!--
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Paste the smallest possible code snippet that triggers the bug.
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If the input data matters, attach a CSV/JSON or paste a few rows inline.
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-->
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```python
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# or rust / js
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import wickra as ta
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...
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```
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## Actual output
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```
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<paste stack trace, panic, wrong values, etc.>
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```
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## Expected output
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<!-- What should the indicator / API have returned? Reference a paper, TA-Lib, or another implementation if possible. -->
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## Additional context
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<!-- Logs, screenshots, links to related issues, anything else useful. -->
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