Add export of JAVA_HOME

[mihael97]

Hello!

During native build compilation inside CI/CD, I need to manually add the JAVA_HOME export.

It would be helpful if the variable is exported by default. I am open to contributing to the implementation.

[findepi]

@mihael97 thanks for the feedback!

on the CI the native image is getting exercised with https://github.com/findepi/graalvm-docker/blob/master/bin/test-native.sh. Of course, this simplistic test doesn't need this env variable. Would you like to help me understand when it's needed? Would be good to have validation that things indeed work as expected.

[mihael97]

Hi @findepi , below is a working example.

Without exported JAVA_HOME - failing:

Failed attempt

```bash ❯ docker run --rm --name example -it -v ${PWD}:/app -w /app findepi/graalvm:java17-all ./gradlew nativeCompile Downloading https://services.gradle.org/distributions/gradle-7.6-bin.zip ...........10%............20%...........30%............40%............50%...........60%............70%............80%...........90%............100% Welcome to Gradle 7.6! Here are the highlights of this release: - Added support for Java 19. - Introduced `--rerun` flag for individual task rerun. - Improved dependency block for test suites to be strongly typed. - Added a pluggable system for Java toolchains provisioning. For more details see https://docs.gradle.org/7.6/release-notes.html Starting a Gradle Daemon (subsequent builds will be faster) > Task :compileJava > Task :processResources > Task :classes > Task :resolveMainClassName > Task :processAot . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v3.0.2) 2023-02-16T18:35:56.568Z INFO 226 --- [ main] mihael.macuka.mail.server.Application : Starting Application using Java 17.0.6 with PID 226 (/app/build/classes/java/main started by root in /app) 2023-02-16T18:35:56.573Z INFO 226 --- [ main] mihael.macuka.mail.server.Application : No active profile set, falling back to 1 default profile: "default" > Task :compileAotJava Note: /app/build/generated/aotSources/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration__BeanDefinitions.java uses or overrides a deprecated API. Note: Recompile with -Xlint:deprecation for details. > Task :processAotResources > Task :aotClasses > Task :jar > Task :generateResourcesConfigFile [native-image-plugin] Resources configuration written into /app/build/native/generated/generateResourcesConfigFile/resource-config.json > Task :nativeCompile FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':nativeCompile'. > Cannot query the value of property 'javaLauncher' because it has no value available. * Try: > Run with --stacktrace option to get the stack trace. > Run with --info or --debug option to get more log output. > Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 1m 2s 9 actionable tasks: 9 executed ```

But, with exported JAVA_HOME, everything works and the application is compiled successfully.

Successfull attempt

```bash ❯ docker run --rm --name example -it -v ${PWD}:/app -e JAVA_HOME=/graalvm -w /app findepi/graalvm:java17-all ./gradlew nativeCompile Downloading https://services.gradle.org/distributions/gradle-7.6-bin.zip ...........10%............20%...........30%............40%............50%...........60%............70%............80%...........90%............100% Welcome to Gradle 7.6! Here are the highlights of this release: - Added support for Java 19. - Introduced `--rerun` flag for individual task rerun. - Improved dependency block for test suites to be strongly typed. - Added a pluggable system for Java toolchains provisioning. For more details see https://docs.gradle.org/7.6/release-notes.html Starting a Gradle Daemon (subsequent builds will be faster) > Task :compileJava UP-TO-DATE > Task :processResources UP-TO-DATE > Task :classes UP-TO-DATE > Task :resolveMainClassName UP-TO-DATE > Task :processAot UP-TO-DATE > Task :compileAotJava UP-TO-DATE > Task :processAotResources UP-TO-DATE > Task :aotClasses UP-TO-DATE > Task :jar UP-TO-DATE > Task :generateResourcesConfigFile UP-TO-DATE > Task :nativeCompile [native-image-plugin] GraalVM Toolchain detection is disabled [native-image-plugin] GraalVM location read from environment variable: JAVA_HOME [native-image-plugin] Native Image executable path: /graalvm/lib/svm/bin/native-image ======================================================================================================================== GraalVM Native Image: Generating 'mail.server' (executable)... ...more not important logs ```

I am trying to compile native image of Spring Boot(version 3.0.2) application

[findepi]

@mihael97 sorry for the delay here. Can you please confirm https://github.com/findepi/graalvm-docker/pull/14 is exactly what you need?

[mihael97]

Hi @findepi , this looks OK and I think it will fix the issue. Thanks!

[findepi]

Thanks @mihael97 for confirming & once again thank you for reporting the issue!