HelloWorld on iOS

HelloWorld is the first milestone to bring Java to iOS. It validates the runtime and ensures core components work correctly.

Why HelloWorld First

• Validate VM + classlibs – confirms that the OpenJDK/mobile VM and standard class libraries work on iOS.
• Close to upstream – minimal program stays aligned with OpenJDK to surface regressions.
• Continuous regression testing – daily builds of HelloWorld.jar detect issues early.

Acceptance Criteria

• VM launches on simulator and device and executes HelloWorld output without crashes.
• Classloaders, basic reflection, and standard library calls succeed.
• Artifact is reproducible and integrated into CI for regression detection.

Steps to get it working

• Running helloworld involves a number of steps described in the ios-tools repo
• For each step you can choose to build (e.g. OpenJDK/mobile) yourself or download a build from the repo's releases

⚠️ Note: Running on an iOS device is working properly. Running on a simulator is still to be fixed.