How to Solve 'java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist' in Java?

Solving "java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist" in Java

Developers working on projects that employ pure native NDK often encounter the "java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist" error when executing their projects. This issue arises when the Java Virtual Machine (JVM) cannot locate the specified class within the defined classpath.

Troubleshooting Steps:

To resolve this error, several troubleshooting steps can be taken:

1. Disable Instant Run:

   • Open Android Studio and navigate to File -> Settings -> Build, Execution, Deployment -> Instant Run.
   • Uncheck the checkbox for instant run and rebuild the project.

2. Verify Project Structure:

   • Ensure that the main activity class is properly declared in the AndroidManifest.xml file.
   • Check if the main activity class is defined in the correct Java package within the project structure.

3. Inspect Classpath Configuration:

   • Examine the Android.mk file to confirm that all necessary dependencies are correctly added to the classpath.
   • Verify that the required JAR or AAR files are present in the libs folder within the project structure.

4. Review JNI Interface:

   • Inspect the JNI interface between Java and native code to ensure that the class is correctly exposed to the Java side.
   • Check the native library's header files and ensure that the function prototypes match the Java method signatures.

5. Clean and Rebuild Project:

   • Clean the project to remove any temporary artifacts that may interfere with the classpath resolution.
   • Rebuild the project to ensure that the latest code changes are reflected in the classpath.

6. Inspect Build Log:

   • Review the build log for any errors or warnings related to classpath configuration.
   • Check for missing or invalid dependencies or any other issues that may hinder the classpath lookup.

By following these steps, developers can systematically troubleshoot and resolve the "java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist" error in their Java projects.

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