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To change a default Eclipse project to an Eclipse Java project you can follow the steps below.

1. First close the project in Eclipse (right-click project folder > close project)
2. Open the .project file in a text-editor outside Eclipse
3. Add the Java builder and nature to the .project file
4. Save and close file
5. Open project in Eclipse and it now is a Java project

Example:
Original .project file

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>A project</name>