How to Fix 'java.lang.ClassNotFoundException' Errors in Android Native Projects?

Troubleshooting "java.lang.ClassNotFoundException" Issue on Android

Problem:

When attempting to run a native Android project, the following error occurs:

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.irrlicht.example1/android.app.POMActivity}: java.lang.ClassNotFoundException: Didn't find class "android.app.POMActivity" on path

Investigation:

The issue seems to be caused by a class not being found on the path, specifically android.app.POMActivity.

Solution:

The provided solution suggests disabling Instant Run in Android Studio.

Steps to Disable Instant Run:

1. Navigate to File -> Settings (or Preferences on macOS).
2. Select Build, Execution, Deployment -> Instant Run.
3. Uncheck the Enable Instant Run to hot swap code and resource changes on app restart checkbox.

Explanation:

Instant Run can sometimes interfere with class loading, especially when using native libraries. Disabling Instant Run allows the app to compile and run without this interference.

Additional Notes:

If disabling Instant Run does not resolve the issue, it is recommended to double-check the following:

• Activity Name: Make sure the activity name (POMActivity) specified in the AndroidManifest.xml matches the class name in the Java code.
• Gradle Build: Ensure that the Gradle build is up-to-date and there are no unresolved dependencies.
• Native Libraries: Verify that the native libraries (libIrrlicht.a and android_native_app_glue) are correctly packaged in the APK.

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