Why Does Eclipse Show \"Source Not Found\" During Java Debugging, and How Can I Fix It?

Debugging Challenges in Eclipse Java Environment: Resolving "Source Not Found" Errors

In Eclipse Java development environments, debugging requires proper accessibility to source files. However, some users encounter the "Source not found" error when stepping into specific files, such as those located in other projects or Maven repositories. This issue can hinder the debugging process and prevent variable inspection. Understanding the causes and implementing effective solutions is crucial.

Causes of "Source Not Found" Error:

1. Missing Source Lookup Path: The Eclipse IDE needs to have access to the source files to perform debugging. If the source file for a given package or class is not included in the source lookup path, the "Source not found" error occurs.
2. Different Project Files: When debugging code in a file from a different project that is linked to the current project, Eclipse may not automatically include it in the source lookup path.
3. Maven Repository Artifacts: Files within Maven dependencies may not be automatically considered part of the source lookup path in Eclipse.

Resolution:

To resolve the "Source not found" error and ensure proper source file accessibility for debugging, follow these steps:

1. Edit Source Lookup Path:

• Open the Debug Configuration window for the target project.
• Select the "Source" tab.
• Click on the "Edit Source Lookup..." button.
• Ensure that the necessary projects and Maven dependencies are included in the source lookup path.

2. Restart Eclipse:

• After modifying the Source Lookup path, it is crucial to restart the Eclipse IDE.
• This will update Eclipse's internal file search mechanisms and allow it to locate the source files correctly.

3. Verify Source Availability:

• After restarting Eclipse, verify that the source files are accessible during debugging.
• If the issue persists, inspect the source lookup path and confirm that all required files and dependencies are included.

By implementing these steps, developers can overcome the "Source not found" error and ensure seamless debugging in Eclipse Java environments.

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