How to Fix 'Class Not Found' Exceptions After a Java Update on Android?

Resolving Class Not Found Exceptions for External Jars in Android Update 17

After updating Java on macOS, developers have encountered "class not found" exceptions at runtime for legacy JARs. This issue affects JARs such as javax.mail and apache.commons.httpclient.

Potential Solutions:

1. Getting Newer JAR Versions:

Consider downloading newer versions of the problematic JARs to check if they resolve the issue.

2. Reverting to a Previous Java Version:

As a temporary solution, you can attempt to revert to a previous version of Java to see if it restores functionality.

3. Isolate the Problem:

It's important to determine if the Java update is the root cause or if there are other factors contributing to the issue. Ensure that:

• The JAR files are located in the correct path.
• The JAR files are compatible with the current Android platform.
• The Android project is properly configured to reference the JAR files.

Including JAR Files in Android Projects:

If the issue persists, the following steps should resolve it:

1. Create a directory named "libs" within your Android project.
2. Copy and paste all necessary external JAR files into the "libs" directory.

Android will automatically include the JAR files in the project's build path, as documented in "Dealing with dependencies in Android projects." This solution will address the class not found exceptions related to external JARs.

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