Why is my Android app throwing a `ClassNotFoundException` for `android.app.POMActivity`?

java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist

This issue arises when the class path cannot locate the specified class during runtime. In the case of your Java application, the stack trace indicates:

java.lang.ClassNotFoundException: Didn't find class "android.app.POMActivity" on path: DexPathList[[zip file "/data/app/com.irrlicht.example1-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.irrlicht.example1-2, /system/lib]]

This suggests that the Java Virtual Machine (JVM) could not find the android.app.POMActivity class within the APK file.

Addressing the Issue

To resolve this issue, you can refer to the following steps:

1. Disable Instant Run: As mentioned in the solution provided, disabling Instant Run (File -> Settings -> Build,Execution, Deployment -> Instant Run) can help resolve the issue.
2. Verify Activity Name: Ensure that the activity name in AndroidManifest.xml matches the Java class name (android.app.POMActivity).
3. Check gradle dependencies: Make sure the project has all necessary dependencies and ensure the Android manifest and build.gradle files are synchronized.
4. Rebuild and Run: After making necessary adjustments, rebuild and run the project.

Additional Troubleshooting Tips

If the above steps do not solve the issue, consider the following:

• Check the classpath: Verify that the classpath in your Java code (if using custom class loaders) includes the relevant directories and JAR files.
• Examine ProGuard rules: If ProGuard is enabled in your project, ensure that the android.app.POMActivity class is not being excluded from obfuscation.
• Debug the runtime: Use a Java debugger to step through the execution and investigate the exact point where the ClassNotFoundException is occurring.

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