I am getting the error with following two imports in Eclipse:
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
The errors are: "The import javafx.scene.control.Alert cannot be resolved" and same is true for the 2nd import statement.
I am using Eclipse Version: Luna Service Release 2 (4.4.2) and have installed e(fx)clipse with latest JDK 1.8 (1.8.0_45).
There is no problem with other javafx related import statements, such as
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.input.MouseEvent;