[Capacitor] 系統安裝 Java 21 時，無法編譯 Android app？
今天想用 Capacitor 編譯 Android 版本的 app，
結果出現如下的錯誤，老實說看不太懂：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':capacitor-android:compileDebugJavaWithJavac'.
> Could not resolve all files for configuration ':capacitor-android:androidJdkImage'.
> Failed to transform core-for-system-modules.jar to match attributes {artifactType=_internal_android_jdk_image,
org.gradle.libraryelements=jar, org.gradle.usage=java-runtime}.
> Execution failed for JdkImageTransform:
/Users/testuser/Library/Android/sdk/platforms/android-33/core-for-system-modules.jar.
> Error while executing process /Users/testuser/.sdkman/candidates/java/21.0.2-oracle/bin/jlink with arguments
{--module-path
/Users/testuser/.gradle/caches/transforms-3/d20b91a7c402245d65bf0047643c0671/transformed/output/temp/jmod
--add-modules java.base --output
/Users/testuser/.gradle/caches/transforms-3/d20b91a7c402245d65bf0047643c0671/transformed/output/jdkImage
--disable-plugin system-modules}
跟 ChatGPT 問了一下，感覺可能是 Android 用到的 Java 沒有支援到 21 那麼新…
上網查了一下，目前 Android 支援的 Java 版本如下：
- Android 14 (API 34) = Java 17
- Android 13 (API 33) = Java 11
- Android 12 (API 32) = Java 11
看起來目前是真的沒有支援到 Java 21…
因為我有用 SDKMAN! 來管理不同的 Java 版本，
因此先看一下目前的 Java 版本，果然是 21.0.2：
$ sdk list java
================================================================================
Available Java Versions for macOS ARM 64bit
================================================================================
Vendor | Use | Version | Dist | Status | Identifier
--------------------------------------------------------------------------------
Oracle | | 23.0.1 | oracle | | 23.0.1-oracle
| | 23 | oracle | | 23-oracle
| | 22.0.2 | oracle | | 22.0.2-oracle
| | 21.0.5 | oracle | | 21.0.5-oracle
| | 21.0.4 | oracle | | 21.0.4-oracle
| >>> | 21.0.2 | oracle | local only | 21.0.2-oracle
| | 17.0.12 | oracle | | 17.0.12-oracle
使用 SDKMAN! 安裝 Oracle Java 17.0.12 版本，
安裝後它問是否要設成預設值 (default)，回答 yes：
sdk install java 17.0.12-oracle
這時再重新跑 Capacitor 編譯 Android 程式，看來就沒問題了：
$ npx cap run android ✔ Copying web assets from www to android/app/src/main/assets/public in 142.36ms ✔ Creating capacitor.config.json in android/app/src/main/assets in 10.53ms [info] Inlining sourcemaps ✔ copy android in 163.82ms ✔ Updating Android plugins in 459.75μs ✔ update android in 27.45ms ✔ Running Gradle build in 70.09s ✔ Deploying app-debug.apk to Pixel_7_Pro_API_35 in 21.00s
(本頁面已被瀏覽過 3 次)