As a new one to Google Guice, I try to use it in my JavaFX project，the purpose is to inject service to a controller class. But java.lang.reflect.InvocationTargetException always appears. The main part is here:
public class App extends Application {
private static Scene scene;
private static Injector injector;
#Override
public void start(Stage stage) throws IOException {
scene = new Scene(loadFXML("ui"), 640, 480);
stage.setScene(scene);
stage.show();
}
private static Parent loadFXML(String fxml) throws IOException {
FXMLLoader fxmlLoader = new FXMLLoader(App.class.getResource(fxml + ".fxml"));
fxmlLoader.setControllerFactory(initilizedClass->{
return injector.getInstance(initilizedClass);
});
return fxmlLoader.load();
}
public static void main(String[] args) {
launch();
}
public void init() {
App.injector = Guice.createInjector(new DiModule());
}
//...
}
//
public class DiModule extends AbstractModule {
#Override
protected void configure() {
bind(IUserListService.class).to(BroadcastUserListService.class);
}
}
//
public interface IUserListService {}
public class BroadcastUserListService implements IUserListService {}
//
public class UIController {
#FXML
private ListView listView;
#Inject
private IUserListService us;
public void initialize() {
//listView.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
us.sendOnlineMessage();
}
}
I use modules and the error details are :
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: com.google.common.util.concurrent.ExecutionError: java.lang.ExceptionInInitializerError
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2199)
at com.google.common.cache.LocalCache.get(LocalCache.java:3934)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)
at guice#4.0/com.google.inject.internal.FailableCache.get(FailableCache.java:48)
at guice#4.0/com.google.inject.internal.ConstructorInjectorStore.get(ConstructorInjectorStore.java:50)
at guice#4.0/com.google.inject.internal.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:136)
at guice#4.0/com.google.inject.internal.InjectorImpl.initializeJitBinding(InjectorImpl.java:547)
at guice#4.0/com.google.inject.internal.InjectorImpl.createJustInTimeBinding(InjectorImpl.java:884)
at guice#4.0/com.google.inject.internal.InjectorImpl.createJustInTimeBindingRecursive(InjectorImpl.java:805)
at guice#4.0/com.google.inject.internal.InjectorImpl.getJustInTimeBinding(InjectorImpl.java:282)
at guice#4.0/com.google.inject.internal.InjectorImpl.getBindingOrThrow(InjectorImpl.java:214)
at guice#4.0/com.google.inject.internal.InjectorImpl.getInternalFactory(InjectorImpl.java:890)
at guice#4.0/com.google.inject.internal.FactoryProxy.notify(FactoryProxy.java:46)
at guice#4.0/com.google.inject.internal.ProcessedBindingData.runCreationListeners(ProcessedBindingData.java:50)
at guice#4.0/com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:134)
at guice#4.0/com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:107)
at guice#4.0/com.google.inject.Guice.createInjector(Guice.java:96)
at guice#4.0/com.google.inject.Guice.createInjector(Guice.java:73)
at guice#4.0/com.google.inject.Guice.createInjector(Guice.java:62)
at com.freelance.ChatterBox/com.freelance.ChatterBox.App.main(App.java:43)
... 11 more
Caused by: java.lang.ExceptionInInitializerError
at guice#4.0/com.google.inject.internal.cglib.reflect.$FastClassEmitter.<init>(FastClassEmitter.java:67)
at guice#4.0/com.google.inject.internal.cglib.reflect.$FastClass$Generator.generateClass(FastClass.java:72)
at guice#4.0/com.google.inject.internal.cglib.core.$DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at guice#4.0/com.google.inject.internal.cglib.core.$AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at guice#4.0/com.google.inject.internal.cglib.reflect.$FastClass$Generator.create(FastClass.java:64)
at guice#4.0/com.google.inject.internal.BytecodeGen.newFastClass(BytecodeGen.java:204)
at guice#4.0/com.google.inject.internal.DefaultConstructionProxyFactory.create(DefaultConstructionProxyFactory.java:54)
at guice#4.0/com.google.inject.internal.ProxyFactory.create(ProxyFactory.java:159)
at guice#4.0/com.google.inject.internal.ConstructorInjectorStore.createConstructor(ConstructorInjectorStore.java:90)
at guice#4.0/com.google.inject.internal.ConstructorInjectorStore.access$000(ConstructorInjectorStore.java:29)
at guice#4.0/com.google.inject.internal.ConstructorInjectorStore$1.create(ConstructorInjectorStore.java:37)
at guice#4.0/com.google.inject.internal.ConstructorInjectorStore$1.create(ConstructorInjectorStore.java:33)
at guice#4.0/com.google.inject.internal.FailableCache$1.load(FailableCache.java:37)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)
... 32 more
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to module guice
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:198)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:192)
at guice#4.0/com.google.inject.internal.cglib.core.$ReflectUtils$2.run(ReflectUtils.java:56)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at guice#4.0/com.google.inject.internal.cglib.core.$ReflectUtils.<clinit>(ReflectUtils.java:46)
... 49 more
Exception running application com.freelance.ChatterBox.App
Related
I'm still fighting with my issue. I want to use Spring Framework in order to incject dependencies and I have to use Spring boot to integrate both.
Unfortunately, in first view autowiring is run correctly, but if I go next Stage, I got still only Null Pointer Exception.
Thats main class:
#SpringBootApplication(scanBasePackages = "boxingchallenge")
public class BoxingChallengeApplication extends Application {
public ConfigurableApplicationContext springContext;
private Parent root;
public static Stage stage;
#Override
public void init() throws Exception {
springContext = SpringApplication.run(BoxingChallengeApplication.class);
springContext.getAutowireCapableBeanFactory().autowireBean(this);
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/FXML/start.fxml"));
fxmlLoader.setControllerFactory(springContext::getBean);
root = fxmlLoader.load();
}
#Override
public void start(Stage primaryStage) throws Exception {
stage = primaryStage;
primaryStage.setTitle("Boxing challenge");
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
#Override
public void stop() {
springContext.stop();
}
public static void main(String[] args) {
launch(BoxingChallengeApplication.class, args);
}
}
Here in first controller class autowiring run cool:
#Component
public class Start {
#FXML
public Button loadGame;
#FXML
public Button create;
#Autowired
private Boxer boxer;
public void load(ActionEvent event) {
System.out.println(boxer.getName());
}
//next stage
public void createNew(ActionEvent event) throws IOException {
Parent root = FXMLLoader.load(getClass().getResource("/FXML/creator.fxml"));
BoxingChallengeApplication.stage.setScene(new Scene(root));
}
}
Here in second stage, autowiring not working:
#Component
public class Creator {
#FXML
public Button ready;
public TextField nation;
public TextField name;
public Boxer boxer;
/*#Autowired
private ApplicationContext context;*/
#Autowired
public void setBoxer(Boxer boxer) {
this.boxer = boxer;
}
public void createdAndPlay(ActionEvent event) {
if (boxer == null)
System.out.println("boxer is null");
else
System.out.println("Injected correctly");
}
}
Thanks, i hope it's going to finished...
#Jewelsea's comment is correct: you must set the controller factory when you load creator.fxml. If you don't do this, the FXMLLoader will create the controller simply by calling its no-arg constructor, so Spring will know nothing about it and will have no opportunity to inject any dependencies.
To do this, all you need is access to the ApplicationContext in Start, and you can inject "well-known objects", of which the ApplicationContext is an example, into your Spring-managed beans:
#Component
public class Start {
#FXML
public Button loadGame;
#FXML
public Button create;
#Autowired
private Boxer boxer;
#Autowired
private ApplicationContext context ;
public void load(ActionEvent event) {
System.out.println(boxer.getName());
}
//next stage
public void createNew(ActionEvent event) throws IOException {
FXMLLoader loader = new FXMLLoader(getClass().getResource("/FXML/creator.fxml"));
load.setControllerFactory(context::getBean);
Parent root = loader.load();
BoxingChallengeApplication.stage.setScene(new Scene(root));
}
}
As an aside, you almost certainly want a new instance of any controller when you load an FXML file, so you should probably make any controllers prototype scope.
I am testing JavaFX with TestFX. Here are my codes:
MainTest:
package com.sample;
+import xx;
public class MainTest extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("mainwindow.fxml"));
primaryStage.setTitle("Test");
primaryStage.setScene(new Scene(root, 909, 621));
primaryStage.show();
primaryStage.toFront();
}
#Before
public void setUp() throws Exception {
}
#After
public void tearDown() throws Exception {
}
}
ControllerTest:
package com.sample
+import xx
class ControllerKTest {
#FXML
private lateinit var root: AnchorPane
private lateinit var snackBar: JFXSnackbar
#FXML
fun initialize() {
snackBarInitialize()
}
private fun snackBarInitialize() {
snackBar = JFXSnackbar(root)
snackBar.styleClass.add("jfx-snackbar-action")
snackBar.stylesheets.add("css/jfoenix-components.css")
}
#Before
fun setUp() {
FxToolkit.registerPrimaryStage()
FxToolkit.setupApplication(MainTest::class.java)
initialize()
}
private var count = 0
#Test
fun onStartButtonMouseClicked() {
if (count++ % 2 == 0) {
snackBar.fireEvent(JFXSnackbar.SnackbarEvent("Toast Message $count"))
} else {
if (count % 4 == 0) {
snackBar.fireEvent(JFXSnackbar.SnackbarEvent(
"Snackbar Message Persistant $count",
"CLOSE",
3000,
true
) { b -> snackBar.close() })
} else {
snackBar.fireEvent(JFXSnackbar.SnackbarEvent(
"Snackbar Message $count",
"UNDO",
3000,
false
) { b -> })
}
}
}
#After
fun tearDown() {
FxToolkit.cleanupStages()
}
}
However, it gives me this:
kotlin.UninitializedPropertyAccessException: lateinit property root has not been initialized
at com.sample.ControllerKTest.snackBarInitialize(ControllerKTest.kt:55)
at com.sample.ControllerKTest.initialize(ControllerKTest.kt:51)
at com.sample.ControllerKTest.setUp(ControllerKTest.kt:64)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Then, how could I make this right?
Your setUp method calls initialize directly, which is wrong: it should only be called by the FXMLLoader.load method because then it runs after it gets the chance to initialize the annotated fields.
This is my first JavaFX program and I want to accept the username via eUser and password via ePass. When I try to check if the textfield is empty using validate I get this error:
Exception in Application start method
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:498)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
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:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException:
file:/Users/dylan/NetBeansProjects/JavaFXApplication2/dist/run350595374/JavaFXApplication2.jar!/javafxapplication2/FXMLDocument.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at javafxapplication2.JavaFXApplication2.start(JavaFXApplication2.java:23)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$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)
Caused by: java.lang.NullPointerException
at javafxapplication2.FXMLDocumentController.initialize(FXMLDocumentController.java:48)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 14 more
Exception running application javafxapplication2.JavaFXApplication2
Java Result: 1
When I comment out eUser.getValidators().add(vali); from Controller.java file and the lines that follow it, then no errors show up.
This is my FXMLDocumentController.java file:
public class FXMLDocumentController implements Initializable {
#FXML
private JFXTextField eUser;
#FXML
private JFXTextField ePass;
#FXML
private void handleClose(MouseEvent event) {
System.exit(0);
}
#Override
public void initialize(URL url, ResourceBundle rb) {
RequiredFieldValidator vali = new RequiredFieldValidator();
eUser.getValidators().add(vali);
vali.setMessage("No Input Given");
vali.focusedProperty().addListener(new ChangeListener<Boolean>(){
public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
if(!newValue)
{
eUser.validate();
}
}});}}
Main class:
public class JavaFXApplication2 extends Application {
#Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
stage.initStyle(StageStyle.UNDECORATED);
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Maybe this could be the problem. In your FXML file, check if you set those ID's to the relevant textfields. That might possibly be the thing which is causing the NullPointerException.
If you're using SceneBuilder, click on the relevant textfield -> Code and set the fx:id of those textFields.
And by the way, you can probably use a PasswordField instead of a TextField :)
I want to create a reference for the FXML Controller by this line in Class Main
Controller controller = (Controller) loader.getController();
to have access to a Controller methode from the Class GrblListener.
Main.controller.updateCurrentPosition(input);
But I always get the error
Exception in thread "EventThread COM5" java.lang.NullPointerException
What's wrong?
Class Main:
public class Main extends Application {
public static Stage stage;
public static Controller controller;
#Override
public void start(Stage stage) throws Exception {
FXMLLoader loader = new FXMLLoader(getClass().getResource("Scene.fxml"));
Parent root = (Parent) loader.load();
Controller controller = (Controller) loader.getController();
Scene scene = new Scene(root);
scene.getStylesheets().add(getClass().getResource("css/default.css").toExternalForm());
stage.setTitle("...");
stage.setScene(scene);
stage.show();
this.stage = stage;
}
public static void main(String[] args) {
launch(args);
}
}
Class GrblListener:
class GrblListener implements SerialPortEventListener {
#Override
public void serialEvent(SerialPortEvent event) {
if(event.isRXCHAR() && event.getEventValue() > 0){
try {
String input = GrblSender.serialPort.readString();
System.out.println(input.trim());
Main.controller.updateCurrentPosition(input);
}
catch (SerialPortException ex) {
System.out.println(ex);
}
}
}
}
You are declaring a local variable in start(), and initializing it:
Controller controller = (Controller) loader.getController();
instead of initializing the static variable you declared:
public static Controller controller ;
public void start(Stage stage) {
controller = (Controller) loader.getController();
// ...
}
So, I'm doing a JavaFX multiview GUI application.
Below is the code so that you can refer to it, don't read through it to find an error yet, I'll explain the problem underneath first ;)
I have a main - which starts the application
public class MyFXMLMain extends Application {
#Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("Wireframe.fxml"));
stage.setTitle("My Fitness App");
Scene mainScene = new Scene(root,805,809);
stage.setScene(mainScene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
ScreensController - that controls loading/setting screens.
public class ScreensController extends StackPane {
private HashMap<String, Node> screens = new HashMap<>();
public ScreensController() {
super();
}
public void addScreen(String name, Node screen) {
screens.put(name, screen);
}
public Node getScreen(String name) {
return screens.get(name);
}
public boolean loadScreen(String name, String resource) {
try {
FXMLLoader myLoader = new FXMLLoader(getClass().getResource(resource));
Parent loadScreen = (Parent) myLoader.load();
ControlledScreen myScreenController = ((ControlledScreen) myLoader.getController());
myScreenController.setScreenParent(this);
addScreen(name, loadScreen);
return true;
}catch(Exception e) {
System.out.println(e.getMessage());
return false;
}
}
public boolean setScreen(final String name) {
if (screens.get(name) != null) { //screen loaded
final DoubleProperty opacity = opacityProperty();
if (!getChildren().isEmpty()) { //if there is more than one screen
Timeline fade = new Timeline(
new KeyFrame(Duration.ZERO, new KeyValue(opacity, 1.0)),
new KeyFrame(new Duration(1000), new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent t) {
getChildren().remove(0); //remove the displayed screen
getChildren().add(0, screens.get(name)); //add the screen
Timeline fadeIn = new Timeline(
new KeyFrame(Duration.ZERO, new KeyValue(opacity, 0.0)),
new KeyFrame(new Duration(800), new KeyValue(opacity, 1.0)));
fadeIn.play();
}
}, new KeyValue(opacity, 0.0)));
fade.play();
} else {
setOpacity(0.0);
getChildren().add(screens.get(name)); //no one else been displayed, then just show
Timeline fadeIn = new Timeline(
new KeyFrame(Duration.ZERO, new KeyValue(opacity, 0.0)),
new KeyFrame(new Duration(2500), new KeyValue(opacity, 1.0)));
fadeIn.play();
}
return true;
} else {
System.out.println("screen hasn't been loaded!!! \n");
return false;
}
}
public boolean unloadScreen(String name) {
if (screens.remove(name) == null) {
System.out.println("Screen didn't exist");
return false;
} else {
return true;
}
}
}
A screen framework - that links the screens to the FXML files.
public class ScreensFramework extends Application {
public static String MAIN_SCREEN = "MyFXMLController";
public static String MAIN_SCREEN_FXML = "Wireframe.fxml";
public static String calendarScreen = "CalendarscreenController";
public static String calendarScreenFXML = "Calendarscreen.fxml";
public static String guideScreen = "GuideScreenController";
public static String guideScreenFXML ="Guidescreen.fxml";
#Override
public void start(Stage primaryStage) {
ScreensController mainContainer = new ScreensController();
mainContainer.loadScreen(ScreensFramework.MAIN_SCREEN, ScreensFramework.MAIN_SCREEN_FXML);
mainContainer.loadScreen(ScreensFramework.calendarScreen,ScreensFramework.calendarScreenFXML);
mainContainer.loadScreen(ScreensFramework.guideScreen,ScreensFramework.guideScreenFXML);
mainContainer.setScreen(ScreensFramework.MAIN_SCREEN);
Group root = new Group();
root.getChildren().addAll(mainContainer);
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
}
An FXML controller - which links to the FXML files and tells FXML what to do when something is clicked.
public class MyFXMLController implements ControlledScreen{
#FXML private TextField givenName;
#FXML private Text targetText;
//#FXML private static TableView<Mass> theTable;
//#FXML private static TableColumn<Mass, String> dateCol;
//#FXML private static TableColumn<Mass, String> massCol;
#FXML private static LineChart<Number,Number> weightChart;
#FXML private static NumberAxis axisX;
#FXML private static NumberAxis axisY;
#FXML private static Label myLabel;
//private static User theUser = new User();
private static ScreensController myController;
#Override
public void setScreenParent(ScreensController screenPage) {
myController = screenPage;
}
#FXML protected void handlePressedCalendarButtonAction(ActionEvent event){
System.out.println("Hello");
}
#FXML protected void mouseclickedcal(MouseEvent mec){
myController.setScreen(ScreensFramework.calendarScreen);
}
}
A controlledscreen - that does this:
public interface ControlledScreen {
public void setScreenParent(ScreensController screenPage);
}
And a CalendarScreenController - that controls one of the multi screens
public class CalendarScreenController implements Initializable, ControlledScreen {
ScreensController myController;
#Override
public void initialize(URL url, ResourceBundle rb) {
}
public void setScreenParent(ScreensController screenParent){
myController = screenParent;
}
#FXML
private void goToMain(ActionEvent event){
myController.setScreen(ScreensFramework.MAIN_SCREEN);
}
}
PROBLEM BELOW
When I run my program it works fine, but then if I click on a button that activates the calendar onclick code here:
#FXML protected void mouseclickedcal(MouseEvent mec){
myController.setScreen(ScreensFramework.calendarScreen);
}
which should set the screen to CalendarScreen.fxml,one of my multi screens but instead, it causes an error below:
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Scene$ClickGenerator.postProcess(Unknown Source)
at javafx.scene.Scene$ClickGenerator.access$8600(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1900(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
at com.sun.glass.ui.win.WinApplication$3$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
... 31 more
Caused by: java.lang.NullPointerException
at myfxml.MyFXMLController.mouseclickedcal(MyFXMLController.java:125)
... 40 more
Line 125 is the code:
#FXML protected void mouseclickedcal(MouseEvent mec){
myController.setScreen(ScreensFramework.calendarScreen);
}
Thank you so much for having a look at this. I can't seem to find the error ;(
Turns out I had 2 mains and they were conflicting and also in my xml code I was calling something that didn't exist in its controller.