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The eighth cross-cutting platform service is live: plug-ins and PBCs now have a real Translator and LocaleProvider instead of the UnsupportedOperationException stubs that have shipped since v0.5. What landed ----------- * New Gradle subproject `platform/platform-i18n` (13 modules total). * `IcuTranslator` — backed by ICU4J's MessageFormat (named placeholders, plurals, gender, locale-aware number/date/currency formatting), the format every modern translation tool speaks natively. JDK ResourceBundle handles per-locale fallback (zh_CN → zh → root). * The translator takes a list of `BundleLocation(classLoader, baseName)` pairs and tries them in order. For the **core** translator the chain is just `[(host, "messages")]`; for a **per-plug-in** translator constructed by VibeErpPluginManager it's `[(pluginClassLoader, "META-INF/vibe-erp/i18n/messages"), (host, "messages")]` so plug-in keys override host keys, but plug-ins still inherit shared keys like `errors.not_found`. * Critical detail: the plug-in baseName uses a path the host does NOT publish, because PF4J's `PluginClassLoader` is parent-first — a `getResource("messages.properties")` against the plug-in classloader would find the HOST bundle through the parent chain, defeating the per-plug-in override entirely. Naming the plug-in resource somewhere the host doesn't claim sidesteps the trap. * The translator disables `ResourceBundle.Control`'s automatic JVM-default locale fallback. The default control walks `requested → root → JVM default → root` which would silently serve German strings to a Japanese-locale request just because the German bundle exists. The fallback chain stops at root within a bundle, then moves to the next bundle location, then returns the key string itself. * `RequestLocaleProvider` reads the active HTTP request's Accept-Language via `RequestContextHolder` + the servlet container's `getLocale()`. Outside an HTTP request (background jobs, workflow tasks, MCP agents) it falls back to the configured default locale (`vibeerp.i18n.defaultLocale`, default `en`). Importantly, when an HTTP request HAS no Accept-Language header it ALSO falls back to the configured default — never to the JVM's locale. * `I18nConfiguration` exposes `coreTranslator` and `coreLocaleProvider` beans. Per-plug-in translators are NOT beans — they're constructed imperatively per plug-in start in VibeErpPluginManager because each needs its own classloader at the front of the resolution chain. * `DefaultPluginContext` now wires `translator` and `localeProvider` for real instead of throwing `UnsupportedOperationException`. Bundles ------- * Core: `platform-i18n/src/main/resources/messages.properties` (English), `messages_zh_CN.properties` (Simplified Chinese), `messages_de.properties` (German). Six common keys (errors, ok/cancel/save/delete) and an ICU plural example for `counts.items`. Java 9+ JEP 226 reads .properties files as UTF-8 by default, so Chinese characters are written directly rather than as `\\uXXXX` escapes. * Reference plug-in: moved from the broken `i18n/messages_en-US.properties` / `messages_zh-CN.properties` (wrong path, hyphen-locale filenames ResourceBundle ignores) to the canonical `META-INF/vibe-erp/i18n/messages.properties` / `messages_zh_CN.properties` paths with underscore locale tags. Added a new `printingshop.plate.created` key with an ICU plural for `ink_count` to demonstrate non-trivial argument substitution. End-to-end smoke test --------------------- Reset Postgres, booted the app, hit POST /api/v1/plugins/printing-shop/plates with three different Accept-Language headers: * (no header) → "Plate 'PLATE-001' created with no inks." (en-US, plug-in base bundle) * `Accept-Language: zh-CN` → "已创建印版 'PLATE-002' (无油墨)。" (zh-CN, plug-in zh_CN bundle) * `Accept-Language: de` → "Plate 'PLATE-003' created with no inks." (de, but the plug-in ships no German bundle so it falls back to the plug-in base bundle — correct, the key is plug-in-specific) Regression: identity, catalog, partners, and `GET /plates` all still HTTP 200 after the i18n wiring change. Build ----- * `./gradlew build`: 13 subprojects, 118 unit tests (was 107 / 12), all green. The 11 new tests cover ICU plural rendering, named-arg substitution, locale fallback (zh_CN → root, ja → root via NO_FALLBACK), cross-classloader override (a real JAR built in /tmp at test time), and RequestLocaleProvider's three resolution paths (no request → default; Accept-Language present → request locale; request without Accept-Language → default, NOT JVM locale). * The architectural rule still enforced: platform-plugins now imports platform-i18n, which is a platform-* dependency (allowed), not a pbc-* dependency (forbidden). What was deferred ----------------- * User-preferred locale from the authenticated user's profile row is NOT in the resolution chain yet — the `LocaleProvider` interface leaves room for it but the implementation only consults Accept-Language and the configured default. Adding it slots in between request and default without changing the api.v1 surface. * The metadata translation overrides table (`metadata__translation`) is also deferred — the `Translator` JavaDoc mentions it as the first lookup source, but right now keys come from .properties files only. Once Tier 1 customisation lands (P3.x), key users will be able to override any string from the SPA without touching code.
