Ndtyjky

I have a list of Japanese dishes and the user select which dish will commande. I'm trying to check which ones of the Checkboxes are selected from a thread and print the price in a Label but when I run my code it returns NullPointerException

here is my code:

int price=0;



@FXML private Label textPrice;



//Dishes

@FXML private CheckBox salade;

@FXML private CheckBox soupeMiso;

@FXML private CheckBox soupe_miso_EBI;



 public void threadPrice() {

    new Thread(new Runnable() {

        @Override public void run() {

            Platform.runLater(new Runnable() {

                @Override public void run() {

                    //selectedSushi() ;



                    if(salade.isSelected()) {

                        System.out.println("salade selected");

                        price=price+Sushi.SALADE.getPrice();

                    }



                    if(soupeMiso.isSelected()) {

                        price=price+Sushi.SOUPE_MISOU.getPrice();

                    }



                    if(soupe_miso_EBI.isSelected()) {

                        price=price+Sushi.SOUPE_MISOU_EBI.getPrice();

                    }





                }

            });



    }}).start();





    String strPrice = Integer.toString(price); 

    textPrice.setText("price:"+strPrice);

}

 <?xml version="1.0" encoding="UTF-8"?>



<?import javafx.geometry.Insets?>

<?import javafx.scene.control.Button?>

<?import javafx.scene.control.CheckBox?>

<?import javafx.scene.control.Label?>

<?import javafx.scene.layout.AnchorPane?>

<?import javafx.scene.layout.HBox?>

<?import javafx.scene.text.Font?>                                                          

<?import javafx.scene.text.Text?>



<AnchorPane xmlns="http://javafx.com/javafx/8.0.171"                                                     xmlns:fx="http://javafx.com/fxml/1"     fx:controller="application.MenuController">

  <children>

     <AnchorPane prefHeight="486.0" prefWidth="617.0">

       <children>

          <HBox layoutX="195.0" layoutY="10.0" prefHeight="49.0" prefWidth="193.0">

           <children>

              <Text strokeType="OUTSIDE" strokeWidth="0.0" text="MENU" textAlignment="CENTER" wrappingWidth="195.6796875">

                 <font>

                    <Font size="52.0" />

                 </font>*

              </Text>

           </children>

        </HBox>

        <HBox layoutX="25.0" layoutY="160.0" prefHeight="26.0" prefWidth="578.0">

           <children>

              <CheckBox fx:id="soupeMiso" mnemonicParsing="false" text="Soupe Miso">

                 <padding>

                    <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />

                 </padding>

              </CheckBox>

              <CheckBox fx:id="salade1" mnemonicParsing="false" text="Salade">

                 <padding>

                    <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />

                 </padding>

              </CheckBox>

              <CheckBox fx:id="soupe_miso_EBI" mnemonicParsing="false" text="Supe Miso EBI">

                 <padding>

                    <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />

                 </padding>

              </CheckBox>

           </children>

        </HBox>

        <HBox layoutX="25.0" layoutY="275.0" prefHeight="26.0" prefWidth="578.0" />

        <Label fx:id="textPrice" layoutX="204.0" layoutY="393.0" prefHeight="44.0" prefWidth="196.0" text="price:">

           <font>

              <Font size="38.0" />

           </font>

        </Label>

        <Button fx:id="order" layoutX="215.0" layoutY="358.0" mnemonicParsing="false" onAction="#selectedSushi" text="ORDER" />

     </children>

  </AnchorPane>

Error:

 Exception in thread "JavaFX Application Thread"   

 java.lang.NullPointerException

 at application.MenuController$1$1.run(MenuController.java:143)

 at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)

 at java.security.AccessController.doPrivileged(Native Method)

 at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)

 at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)

 at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)

 at com.sun.glass.ui.gtk.GtkApplication.lambda$null$48(GtkApplication.java:139)

 at java.lang.Thread.run(Thread.java:748)