I have an Excel file that i load it in tableView the data of this file i load it in variable data, i want to pass this variable to another controller ControllerTwo to do some stuff on it but it returs a null pointer exception
any prposition will be appreciated
Main:
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("guiOne.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 500, 500));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
ControllerOne:
public class ControllerOne implements Initializable {
@FXML Pane pane;
//-----------------Observable Data List-------------
ObservableList<ObservableList<String>> observableDataList = FXCollections.observableArrayList();
public List<List<String>> getData() {
return data;
}
List<List<String>> data;
//-------------TABLE VIEW--------------------
@FXML
private TableView<ObservableList<String>> dataTableView;
@Override
public void initialize(URL location, ResourceBundle resources) {
//dataTableView.setItems(observableDataList);
}
//////////////////----LOAD DATA---////////////////////////
public void loadData(ActionEvent event) throws IOException {
//---------FILE CHOOSER
FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open file");
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("XLSX files (*.xlsx)", "*.xlsx");
fileChooser.getExtensionFilters().add(extFilter);
File file = fileChooser.showOpenDialog(dataTableView.getScene().getWindow());
//----------Get data from excel file
data = readExcelFile(file.getPath());//
//------------ADD TO OBSERVABLE
for (int i = 1; i < data.size(); i++) {
observableDataList.add(FXCollections.observableArrayList(data.get(i)));
}
//-------------FILL TABLE
for (int i = 0; i < data.get(1).size(); i++) {
int numCol = i;
TableColumn<ObservableList<String>, String> column = null;
if (i == 0) {
column = new TableColumn<>(" ");
}
if (i != 0) {
column = new TableColumn<>("g" + (numCol - 1));
}
column.setCellValueFactory(param -> new ReadOnlyObjectWrapper<>(param.getValue().get(numCol)));
column.setPrefWidth(75);
dataTableView.getColumns().add(column);
}
dataTableView.setItems(observableDataList);
}
////////////////---------READ EXCEL FILE------////////////////////////
private List<List<String>> readExcelFile(String filePath) {
List<List<String>> excelContent = new ArrayList<>();
try (InputStream inputStream = new FileInputStream(filePath)) {
DataFormatter formatter = new DataFormatter();
Workbook workbook = WorkbookFactory.create(inputStream);
Sheet sheet = workbook.getSheetAt(0);
for (Row row : sheet) {
List<String> tempList = new ArrayList();
for (Cell cell : row) {
String text = formatter.formatCellValue(cell);
//tempList.add(text.length() == 0 ? "" : text);
tempList.add(text);
}
excelContent.add(tempList);
}
}
catch (IOException | EncryptedDocumentException ex) {
System.out.println(ex.toString());
}
return excelContent;
}
public void passToGuiTwo(ActionEvent event) {
Parent root = null;
try {
root = FXMLLoader.load(getClass().getResource("guiTwo.fxml"));
} catch (IOException e) {
e.printStackTrace();
}
((Stage)pane.getScene().getWindow()).setScene(new Scene(root, 200, 200));
}
}
FXML of Controller One:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>
<Pane fx:id="pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: white;" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.ControllerOne">
<children>
<VBox prefHeight="303.0" prefWidth="600.0">
<children>
<Button mnemonicParsing="false" onAction="#loadData" prefHeight="25.0" prefWidth="173.0" style="-fx-background-color: black; -fx-background-radius: 0;" text="import file " textFill="RED">
<VBox.margin>
<Insets bottom="20.0" left="200.0" top="20.0" />
</VBox.margin>
<font>
<Font name="Arial Black" size="16.0" />
</font>
</Button>
<TableView fx:id="dataTableView" prefHeight="200.0" prefWidth="200.0">
<VBox.margin>
<Insets left="10.0" right="10.0" />
</VBox.margin>
</TableView>
<Button mnemonicParsing="false" onAction="#passToGuiTwo" prefHeight="25.0" prefWidth="580.0" text="Pass To guiTwo">
<VBox.margin>
<Insets left="10.0" top="20.0" />
</VBox.margin>
</Button>
</children>
</VBox>
</children>
</Pane>
ControllerTwo:
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;
import java.io.IOException;
import java.net.URL;
import java.util.List;
import java.util.ResourceBundle;
public class ControllerTwo implements Initializable {
List<List<String>> d;
public ControllerTwo() throws IOException {
}
@Override
public void initialize(URL location, ResourceBundle resources) {
}
public void getDataFromOne(ActionEvent event) {
FXMLLoader loader = new FXMLLoader(getClass().getResource("guiTwo.fxml"));
ControllerOne controller1 = loader.getController();
d= controller1.getData();
}
}
FXML of ControllerTwo:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.Pane?>
<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.ControllerTwo">
<children>
<Button layoutX="181.0" layoutY="139.0" mnemonicParsing="false" onAction="#getDataFromOne" prefHeight="64.0" prefWidth="202.0" text="get DATA" />
</children>
</Pane>
**ERROR: **
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8411)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 48 more
Caused by: java.lang.NullPointerException
at sample.ControllerTwo.getDataFromOne(ControllerTwo.java:33)
... 58 more
