java - Getting user input from JavaFX -


the file below source code mainwindow.fxml file.

public class mainwindowcontroller implements initializable {     @fxml     private textfield fullname;     @fxml     private textfield email;     @fxml     private textfield telephonenumber;     @fxml     private textfield mobilenumber;      @fxml     protected void handlebuttonaction(actionevent event) {         string text = this.fullname.gettext();         system.out.println("hello");     }      @override     public void initialize(url url, resourcebundle rb) {         // todo     }  }

and, fxml file:

<?xml version="1.0" encoding="utf-8"?>  <?import java.lang.*?> <?import java.util.*?> <?import javafx.scene.*?> <?import javafx.scene.control.*?> <?import javafx.scene.layout.*?>  <vbox maxheight="-infinity" maxwidth="-infinity" minheight="-infinity" minwidth="-infinity" prefheight="400.0" prefwidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="addressbook.mainwindowcontroller">    <children>       <menubar>          <menus>             <menu mnemonicparsing="false" text="create address">             </menu>             <menu mnemonicparsing="false" text="view addresses">             </menu>          </menus>       </menubar>       <pane prefheight="371.0" prefwidth="600.0">          <children>             <label layoutx="154.0" layouty="47.0" text="full name:" />             <label layoutx="181.0" layouty="75.0" text="email:" />             <label layoutx="100.0" layouty="103.0" text="telephone number:" />             <label layoutx="122.0" layouty="132.0" text="mobile number:" />             <textfield fx:id="fullname" layoutx="238.0" layouty="42.0" />             <textfield fx:id="email" layoutx="238.0" layouty="70.0" />             <textfield fx:id="telephonenumber" layoutx="238.0" layouty="98.0" />             <textfield fx:id="mobilenumber" layoutx="238.0" layouty="127.0" />             <button layoutx="343.0" layouty="173.0" mnemonicparsing="false" text="create" onaction="#handlebuttonaction" />          </children>       </pane>    </children> </vbox>

however, whenever hit submit button in application, error:

executing /users/hassan/netbeansprojects/addressbook/dist/run2031742049/addressbook.jar using platform /library/java/javavirtualmachines/jdk1.8.0_45.jdk/contents/home/jre/bin/java exception in thread "javafx application thread" java.lang.runtimeexception: java.lang.reflect.invocationtargetexception     @ javafx.fxml.fxmlloader$methodhandler.invoke(fxmlloader.java:1770)     @ javafx.fxml.fxmlloader$controllermethodeventhandler.handle(fxmlloader.java:1653)     @ com.sun.javafx.event.compositeeventhandler.dispatchbubblingevent(compositeeventhandler.java:86)     @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(eventhandlermanager.java:238)     @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(eventhandlermanager.java:191)     @ com.sun.javafx.event.compositeeventdispatcher.dispatchbubblingevent(compositeeventdispatcher.java:59)     @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(basiceventdispatcher.java:58)     @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(eventdispatchchainimpl.java:114)     @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(basiceventdispatcher.java:56)     @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(eventdispatchchainimpl.java:114)     @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(basiceventdispatcher.java:56)     @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(eventdispatchchainimpl.java:114)     @ com.sun.javafx.event.eventutil.fireeventimpl(eventutil.java:74)     @ com.sun.javafx.event.eventutil.fireevent(eventutil.java:49)     @ javafx.event.event.fireevent(event.java:198)     @ javafx.scene.node.fireevent(node.java:8390)     @ javafx.scene.control.button.fire(button.java:185)     @ com.sun.javafx.scene.control.behavior.buttonbehavior.mousereleased(buttonbehavior.java:182)     @ com.sun.javafx.scene.control.skin.behaviorskinbase$1.handle(behaviorskinbase.java:96)     @ com.sun.javafx.scene.control.skin.behaviorskinbase$1.handle(behaviorskinbase.java:89)     @ com.sun.javafx.event.compositeeventhandler$normaleventhandlerrecord.handlebubblingevent(compositeeventhandler.java:218)     @ com.sun.javafx.event.compositeeventhandler.dispatchbubblingevent(compositeeventhandler.java:80)     @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(eventhandlermanager.java:238)     @ com.sun.javafx.event.eventhandlermanager.dispatchbubblingevent(eventhandlermanager.java:191)     @ com.sun.javafx.event.compositeeventdispatcher.dispatchbubblingevent(compositeeventdispatcher.java:59)     @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(basiceventdispatcher.java:58)     @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(eventdispatchchainimpl.java:114)     @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(basiceventdispatcher.java:56)     @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(eventdispatchchainimpl.java:114)     @ com.sun.javafx.event.basiceventdispatcher.dispatchevent(basiceventdispatcher.java:56)     @ com.sun.javafx.event.eventdispatchchainimpl.dispatchevent(eventdispatchchainimpl.java:114)     @ com.sun.javafx.event.eventutil.fireeventimpl(eventutil.java:74)     @ com.sun.javafx.event.eventutil.fireevent(eventutil.java:54)     @ javafx.event.event.fireevent(event.java:198)     @ javafx.scene.scene$mousehandler.process(scene.java:3758)     @ javafx.scene.scene$mousehandler.access$1500(scene.java:3486)     @ javafx.scene.scene.impl_processmouseevent(scene.java:1762)     @ javafx.scene.scene$scenepeerlistener.mouseevent(scene.java:2495)     @ com.sun.javafx.tk.quantum.glassvieweventhandler$mouseeventnotification.run(glassvieweventhandler.java:350)     @ com.sun.javafx.tk.quantum.glassvieweventhandler$mouseeventnotification.run(glassvieweventhandler.java:275)     @ java.security.accesscontroller.doprivileged(native method)     @ com.sun.javafx.tk.quantum.glassvieweventhandler.lambda$handlemouseevent$350(glassvieweventhandler.java:385)     @ com.sun.javafx.tk.quantum.glassvieweventhandler$$lambda$180/1840023445.get(unknown source)     @ com.sun.javafx.tk.quantum.quantumtoolkit.runwithoutrenderlock(quantumtoolkit.java:404)     @ com.sun.javafx.tk.quantum.glassvieweventhandler.handlemouseevent(glassvieweventhandler.java:384)     @ com.sun.glass.ui.view.handlemouseevent(view.java:555)     @ com.sun.glass.ui.view.notifymouse(view.java:927) caused by: java.lang.reflect.invocationtargetexception     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:497)     @ sun.reflect.misc.trampoline.invoke(methodutil.java:71)     @ sun.reflect.generatedmethodaccessor1.invoke(unknown source)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:497)     @ sun.reflect.misc.methodutil.invoke(methodutil.java:275)     @ javafx.fxml.fxmlloader$methodhandler.invoke(fxmlloader.java:1765)     ... 46 more caused by: java.lang.nullpointerexception     @ addressbook.mainwindowcontroller.handlebuttonaction(mainwindowcontroller.java:31)     ... 56 more

i tried test whether event causing error, when remove line gettext() method, fixes error.

try rename fullname fullname match fxml id


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