I'm getting this error

Exception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Ap plication at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source) Caused by: java.lang.ClassNotFoundException: javafx.application.Application at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 13 more 

When trying to run my class file, this is the source

import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage; import java.util.concurrent.Executor; public class TestApplication extends Application{ @Override public void start(Stage stage) throws Exception { new TestApplication(); } public TestApplication() { try{ final Parent root = FXMLLoader.load(Executor.class.getResource("test.fxml")); final Stage stage = new Stage(){{ setScene(new Scene(root, 300, 250)); setTitle("Test"); setResizable(false); show(); }}; }catch(Exception e){ e.printStackTrace(); } } } 

The fxml file contains a simple gui.