Why Are My Old JARs Throwing 'Class Not Found' Exceptions After Updating to Java 17?

Android Update 17 and Jars Compatibility

You've recently updated your Mac's Java installation, and now your old jars are throwing "class not found" exceptions at runtime. You suspect this is related to the update, but you need to verify the cause and find a solution.

Jar Compatibility Issues

The issue you're experiencing indicates that the classes used by your jars are not being found during runtime. This could be due to several reasons, including:

• Incompatibility between the new Java version and the jar's internal structure
• Missing jars or missing dependencies
• Incorrect classpath settings

Solutions

To resolve this issue, try the following solutions:

• Check Jar Compatibility: Ensure that your jars are compatible with the new Java version. Check the jar's documentation or contact the jar's developer to inquire about compatibility.
• Update Jars: If necessary, obtain more recent versions of the jars that contain the missing classes. Make sure that these new versions are compatible with your Android project.
• Check Classpath: Verify that the classpath is correctly configured in your Android project. The classpath specifies where the JVM looks for classes, including external jars. Ensure that the libs folder containing your jars is included in the classpath.

Alternative to Updating Jars

If updating the jars is not feasible, you can try an alternative solution:

• Include external jars in the 'libs' folder: Create a folder named 'libs' in your project directory. Copy and paste the needed external jars into this folder. The Android project will automatically include these jars as part of the build process.

Follow these steps to resolve the "class not found" exceptions you're experiencing due to Java update 17. Remember to test your application thoroughly after applying any solutions to ensure that the issue has been resolved.

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