How to Fix 'Error: Selection does not contain a main type' in Eclipse?

Troubleshooting "Error: Selection does not contain a main type" in Eclipse

When attempting to run Java files within a fresh project, users may encounter the error "Selection does not contain a main type." This issue arises when the folder containing the main Java class is not designated as a source folder within Eclipse. To rectify this issue and successfully execute the main file, follow the steps outlined below:

• Locate the folder containing the main Java class with the main method.
• Right-click on the folder and navigate to Build Path.
• Select Use as Source Folder to designate the folder as a source directory.

After completing these steps, the option to run the main file as a Java application should become available. To execute the main file, right-click on the class file and select Run as Java Application.

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