I'm trying to build a Library Management System, In the Home page I want when the user clicks a button it should popup that screen (for example - if I click add members button Add Members screen should popup and the user should be able to access it)
I have tried googling the error but to no avail
Error -
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1862)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1729)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8889)
at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:208)
at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:247)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3856)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1851)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2584)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1857)
... 46 more
Caused by: java.lang.NullPointerException
at java.base/java.util.Objects.requireNonNull(Objects.java:208)
at Home.HomeController.loadWindow(HomeController.java:42)
at Home.HomeController.loadAddBooks(HomeController.java:21)
... 57 more
Process finished with exit code 0
Home.fxml -
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.control.Menu?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.MenuItem?>
<?import javafx.scene.control.Tab?>
<?import javafx.scene.control.TabPane?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>
<StackPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="700.0" prefWidth="1000.0" xmlns="http://javafx.com/javafx/16" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Home.HomeController">
<children>
<BorderPane prefHeight="200.0" prefWidth="200.0">
<top>
<MenuBar BorderPane.alignment="CENTER">
<menus>
<Menu mnemonicParsing="false" text="File">
<items>
<MenuItem mnemonicParsing="false" text="Close" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Edit">
<items>
<MenuItem mnemonicParsing="false" text="Delete" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Help">
<items>
<MenuItem mnemonicParsing="false" text="About" />
</items>
</Menu>
</menus>
</MenuBar>
</top>
<right>
<VBox prefHeight="673.0" prefWidth="198.0" BorderPane.alignment="CENTER">
<children>
<Button fx:id="AddMem" mnemonicParsing="false" onAction="#loadAddMembers" prefHeight="103.0" prefWidth="198.0" text="Add Member">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="20.0" />
</VBox.margin>
</Button>
<Button fx:id="AddBook" layoutX="20.0" layoutY="20.0" mnemonicParsing="false" onAction="#loadAddBooks" prefHeight="103.0" prefWidth="198.0" text="Add Book">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="20.0" />
</VBox.margin>
</Button>
<Button fx:id="ViewMem" layoutX="20.0" layoutY="143.0" mnemonicParsing="false" onAction="#loadViewMembers" prefHeight="103.0" prefWidth="198.0" text="View Members">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="20.0" />
</VBox.margin>
</Button>
<Button fx:id="ViewBook" layoutX="20.0" layoutY="266.0" mnemonicParsing="false" onAction="#loadViewBooks" prefHeight="103.0" prefWidth="198.0" text="View Book ">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="20.0" />
</VBox.margin>
</Button>
<Button layoutX="20.0" layoutY="389.0" mnemonicParsing="false" prefHeight="103.0" prefWidth="198.0" text="Settings">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="20.0" />
</VBox.margin>
</Button>
</children>
</VBox>
</right>
<center>
<TabPane prefHeight="200.0" prefWidth="200.0" tabClosingPolicy="UNAVAILABLE" BorderPane.alignment="CENTER">
<tabs>
<Tab text="Issue">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<VBox prefHeight="642.0" prefWidth="802.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<HBox prefHeight="200.0" prefWidth="802.0">
<children>
<TextField alignment="CENTER" promptText="Enter Book ID">
<HBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="90.0" />
</HBox.margin>
</TextField>
<VBox alignment="CENTER" prefHeight="200.0" prefWidth="634.0">
<HBox.margin>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</HBox.margin>
<children>
<Text layoutX="10.0" layoutY="55.0" strokeType="OUTSIDE" strokeWidth="0.0" text="BOOK ID" wrappingWidth="178.884765625">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
<Text strokeType="OUTSIDE" strokeWidth="0.0" text="BOOK NAME" wrappingWidth="178.08837890625">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
<Text layoutX="10.0" layoutY="23.0" strokeType="OUTSIDE" strokeWidth="0.0" text="BOOK AUTHOR" wrappingWidth="180.43017578125">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
<Text layoutX="10.0" layoutY="39.0" strokeType="OUTSIDE" strokeWidth="0.0" text="BOOK PUBLISHER" wrappingWidth="180.6640625">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
</children>
</VBox>
</children>
</HBox>
<HBox layoutX="10.0" layoutY="10.0" prefHeight="200.0" prefWidth="802.0">
<children>
<TextField alignment="CENTER" promptText="Enter Member ID">
<HBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="90.0" />
</HBox.margin>
</TextField>
<VBox alignment="CENTER" prefHeight="200.0" prefWidth="634.0">
<HBox.margin>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</HBox.margin>
<children>
<Text layoutX="10.0" layoutY="55.0" strokeType="OUTSIDE" strokeWidth="0.0" text="MEMBER ID" wrappingWidth="178.884765625">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
<Text strokeType="OUTSIDE" strokeWidth="0.0" text="MEMBER NAME" wrappingWidth="178.08837890625">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
<Text layoutX="10.0" layoutY="23.0" strokeType="OUTSIDE" strokeWidth="0.0" text="MEMBER EMAIL" wrappingWidth="180.43017578125">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
<Text layoutX="10.0" layoutY="39.0" strokeType="OUTSIDE" strokeWidth="0.0" text="MEMBER CONTACT" wrappingWidth="180.6640625">
<VBox.margin>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</VBox.margin>
</Text>
</children>
</VBox>
</children>
</HBox>
<HBox alignment="CENTER" prefHeight="243.0" prefWidth="802.0">
<children>
<Button mnemonicParsing="false" styleClass="action-button" stylesheets="@homestyle.css" text="Issue">
<font>
<Font name="DejaVu Sans Mono Bold" size="30.0" />
</font>
</Button>
</children>
</HBox>
</children>
</VBox>
</children></AnchorPane>
</content>
</Tab>
<Tab text="Renew ">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<BorderPane prefHeight="642.0" prefWidth="802.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<top>
<TextField alignment="CENTER" prefHeight="51.0" prefWidth="50.0" promptText="Enter Book ID" BorderPane.alignment="CENTER">
<BorderPane.margin>
<Insets left="150.0" right="150.0" />
</BorderPane.margin>
</TextField>
</top>
<center>
<ListView prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</ListView>
</center>
<bottom>
<HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<children>
<Button alignment="CENTER" mnemonicParsing="false" styleClass="action-button" stylesheets="@homestyle.css" text="Return">
<HBox.margin>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</HBox.margin>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</Button>
<Button mnemonicParsing="false" styleClass="action-button" stylesheets="@homestyle.css" text="Renew">
<HBox.margin>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</HBox.margin>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</Button>
</children>
</HBox>
</bottom>
</BorderPane>
</children></AnchorPane>
</content>
</Tab>
</tabs>
</TabPane>
</center>
</BorderPane>
</children>
</StackPane>
HomeController.java -
package Home;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import java.io.IOException;
import java.util.Objects;
import java.util.logging.Level;
import java.util.logging.Logger;
public class HomeController {
@FXML
void loadAddBooks(ActionEvent event) {
loadWindow("/src/AddMember/AddMember.fxml","HEY");
}
@FXML
void loadAddMembers(ActionEvent event) {
loadWindow("/src/AddBook/AddBook.fxml","HEY");
}
@FXML
void loadViewBooks(ActionEvent event) {
loadWindow("/src/DisplayBook/DisplayBook.fxml","HEY");
}
@FXML
void loadViewMembers(ActionEvent event) {
loadWindow("src/DisplayMembers/DisplayMembers.fxml","HEY");
}
void loadWindow(String loc, String title) {
try {
Parent parent = FXMLLoader.load(Objects.requireNonNull(getClass().getClassLoader().getResource(loc)));
Stage stage = new Stage(StageStyle.DECORATED);
stage.setTitle(title);
stage.setScene(new Scene(parent));
stage.show();
} catch (IOException ex) {
Logger.getLogger(HomeController.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
HomeMain.java -
package Home;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class HomeMain extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("Home.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args){
launch(args);
}
}
