Java FX cannot get the listview to display data in my program

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Java

JavaFX

In my program i have to change the color of a string using radio buttons and change the size of the string from the list view. I seem to be running into multiple errors in my listview code and im not sure what the problem is. I am using e(fx)clipse.

What I have tried:

package employee.view;




import javafx.beans.value.ChangeListener;
import javafx.scene.paint.Paint;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ListView;

public class MainController {

@FXML
private BorderPane myPane;

@FXML
private RadioButton blackRadioButton;

@FXML
private ToggleGroup colorToggleGroup;

@FXML
private RadioButton redRadioButton;

@FXML
private RadioButton blueRadioButton;

@FXML
private RadioButton greenRadioButton;

@FXML
private ListView<string> mylistView;

@FXML
private CheckBox boldCheckBox;

@FXML
private CheckBox italicCheckBox;

String Text;
Text sample=new Text(50,300,"SAMPLE");
FontWeight weight = FontWeight.NORMAL; // FontWeight.BOLD is boldface
FontPosture posture = FontPosture.REGULAR; // FontPosture.ITALIC is italic
int size=18;
boolean fontBold = false;
boolean fontItalic = false;

public void initialize() {
blackRadioButton.setUserData(Color.BLACK);
redRadioButton.setUserData(Color.RED);
greenRadioButton.setUserData(Color.GREEN);
blueRadioButton.setUserData(Color.BLUE);
myPane.getChildren( ).add( sample );
sample.setFont(Font.font("Verdana", weight, posture, size));

ObservableList<string> items =FXCollections.observableArrayList (
"18", "26", "38", "56");
mylistView.setItems(items);

mylistView.getSelectionModel().selectedItemProperty().addListener(
new ChangeListener<string>() {
public void changed(ObservableValue<? extends String> ov,
String old_val, String new_val) {
size = Integer.parseInt(new_val);
sample.setFont(Font.font("Verdana", weight, posture, size));
}
});


}


@FXML
void boldCheckBoxSelected(ActionEvent event) {


}

@FXML
void colorRadioButtonSelected(ActionEvent event) {
if ((Color) colorToggleGroup.getSelectedToggle().getUserData() == Color.BLUE) {
sample.setStroke(Color.BLUE);
}

if ((Color) colorToggleGroup.getSelectedToggle().getUserData() == Color.GREEN) {
sample.setStroke(Color.GREEN);
}

if ((Color) colorToggleGroup.getSelectedToggle().getUserData() == Color.RED) {
sample.setStroke(Color.RED);
}

if ((Color) colorToggleGroup.getSelectedToggle().getUserData() == Color.BLACK) {
sample.setStroke(Color.BLACK);
}

}

@FXML
void italicCheckBoxSelected(ActionEvent event) {

}

}

Errors:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unknown Source)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Source)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: javafx.fxml.LoadException:
/C:/Users/lilj9/eclipse-workspace/empl/bin/employee/view/Mainview.fxml

at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.load(Unknown Source)
at employee.Main.showMainView(Main.java:29)
at employee.Main.start(Main.java:19)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(Unkn own Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
... 1 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javafx.reflect.Trampoline.invoke(Unknown Source)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(Unknown Source)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(Unknown Source)
... 14 more
Caused by: java.lang.NullPointerException
at employee.view.MainController.initialize(MainController.java:71)
... 24 more
Exception running application employee.Main