Accessing controls of a controller from another controller in javafx

Question

I am building an simple javafx application using afterburner. I have main window which have a border pane and it's upper part contains menus and in center it have a vertical split pane which have two anchor panes with fx:id=inputPane and fx:id=tablePane. Now in inputPane i am loading different scenes and submitting data from it into tablePane.

Now i have a scene opened in inputPane which have a button and i want to submit the data from this scene into table as well as i want to open an another scene into inputPane and again want to submit it's data into table.

adara.fxml

<BorderPane fx:id="mainPane" maxHeight="-Infinity" maxWidth="-Infinity"  minHeight="180.0" minWidth="-Infinity" prefHeight="507.0" prefWidth="800.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.qaf.presentation.adara.AdaraPresenter">
<top>
  <Pane prefHeight="26.0" prefWidth="800.0" BorderPane.alignment="CENTER">
     <children>
        <MenuBar fx:id="menuBar" prefHeight="25.0" prefWidth="800.0">
           <menus>
              <Menu mnemonicParsing="false" text="Stock">
                 <items>
                    <MenuItem fx:id="createStock" mnemonicParsing="false" onAction="#showCreateStockForm" text="Create" />
                    <MenuItem fx:id="incoming" mnemonicParsing="false" onAction="#showIncomingForm" text="Incoming" />
                 </items>
              </Menu>
           </menus>
        </MenuBar>
     </children>
  </Pane>
</top>
 <center>
  <SplitPane dividerPositions="0.5" orientation="VERTICAL" prefHeight="469.0" prefWidth="800.0" BorderPane.alignment="CENTER">
    <items>
        <BorderPane fx:id="contentBorderPane" prefHeight="200.0" prefWidth="200.0">
           <center>
              <AnchorPane fx:id="contentBox" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
           </center>
        </BorderPane>
      <AnchorPane fx:id="tableBox" minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0" />
    </items>
  </SplitPane>
</center>
</BorderPane>

adaraView.java

public class AdaraView extends FXMLView {

}

adaraPresenter.java

public class AdaraPresenter implements Initializable {
    @FXML
    AnchorPane contentBox;
    @FXML
    AnchorPane tableBox;


    StockCreationPresenter stockCreationPresenter;
    InwardsPresenter inwardsPresenter;
    ViewStockPresenter viewStockPresenter;



    @Override
    public void initialize(URL location, ResourceBundle resources) {       
        StockCreationView scView = new StockCreationView();  

        // other codes     
        .
        .


        ViewStockView vsView = new ViewStockView();

        // other codes     
        .
        .

        contentBox.getChildren().add(scView.getView());
        tableBox.getChildren().add(vsView.getView());
    }

    public void showCreateStockForm(){
        StockCreationView scView = new StockCreationView();

        // other codes     
        .
        .
        ViewStockView vsView = new ViewStockView();

        // other codes     
        .
        .

        contentBox.getChildren().add(scView.getView());
        tableBox.getChildren().add(vsView.getView());
    }
    public void showIncomingForm(){
        InwardsView inView = new InwardsView();

        // other codes     
        .
        .

        ViewStockView vsView = new ViewStockView();

        // other codes     
        .
        .

        contentBox.getChildren().add(inView.getView());
        tableBox.getChildren().add(vsView.getView());
    }
}

Here is the main class which is starting the stage and application.

Main.java

public class App extends Application
{
    @Override
    public void start(Stage stage) throws Exception {        
        AdaraView appView = new AdaraView();       
        Scene scene = new Scene(appView.getView());    
        stage.setTitle("Adara");
        final String uri = getClass().getResource("app.css").toExternalForm();        
        scene.getStylesheets().add(uri);
        stage.setScene(scene);
        stage.show();
    }

    @Override
    public void stop() throws Exception {        
        Injector.forgetAll();
    }

    public static void main(String[] args) {        
        launch(args);
    }
}

Now here is the InwardsPresenter.java which have to save the stockCreationPresenter.java data into table as well as it have to open the inwardsView into the contentPane.

InwardsPresenter.java

public class InwardsPresenter implements Initializable {
    @FXML
    Button saveButton;
    @FXML 
    TextField orderNo;
    @FXML 
    TextField other;
    @FXML
    CheckBox save;

    @Inject
    AdaraPresenter adaraPresenter;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

    }


    public void save() {

        Inwards inward = newInward();

        inward.setOrderNo(Integer.parseInt(orderNo.getText()));
        inward.setOther(other.getText());
        inward.setSave(save.isSelected());

        this.newInward.set(inward);

        adaraPresenter.incomingForm();
    }
} 

// while executing adaraPresenter.incomingForm(); it's showing NPE to contentBox and tableBox.

                 Thank you very much for any help.