The classpath configuration means the setting of paths to the source files or folders. This class path will be used for project sources compilation. Classpath file is located in the root of the project's directory, but it is not visible in the browser tree because it cannot be directly edited by user.

View the sources paths of the project

1. Select the created project item in the Workspace pane.

2. Go to File --> Configure Classpath... from the top menu to open the Configure Classpath form as below:

3. Add or remove source in the tree.

4. Click Save save changes in the classpath configuration, or Cancel to discard changes.