How to Fix \'Source Not Found\' Errors in Eclipse Java Debugging?

Eclipse Java Debugging: Troubleshooting "Source Not Found" Errors

While debugging a Java application in Eclipse, you may encounter a "Source not found" error when:

• Stepping into a file from a different project that's already imported
• Stepping into a file from an installed Maven repository

The files exist, but Eclipse won't recognize them and display an "Attach Source" button instead.

Reason for the Error

Eclipse uses source lookup paths to determine the location of source files for debugging. When these paths are not properly configured, Eclipse cannot find the source files and displays the "Source not found" error.

Solution

To resolve this error, follow these steps to configure Eclipse's source lookup paths:

1. Edit Source Lookup

• Select the "Edit Source Lookup..." command from the debug view.
• This will open the Source Path Dialog.

2. Add Project JARS to Source Path

• For files from a different project, add the corresponding JAR file to the source path.
• For files from Maven repositories, add the repository path to the source path.

3. Rebuild Java Projects

• After updating the source lookup paths, rebuild all affected Java projects.

Restart Eclipse

For the changes to take effect, restart Eclipse completely.

Additional Notes

• Manually attaching the source for each dependency isn't practical. Use the steps above to automatically configure source lookup paths.
• If the error persists, ensure that the files have the correct file extension (.java).
• Double-check that the source lookup paths are configured correctly.

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