A JavaFX text field with a listener gives: "java.lang.IllegalArgumentException: start must be <= end"

I get an exception and don't understand what causes it. This is an FX application with FXML files. In the init () part of the application, I add a listener to the text box that calls the function that controls the regular expression string for the template.

 tf.textProperty().addListener( (observable, oldValue, newValue) -> { handleInput(newValue); }); 

function:

 private void handleInput(String s) { s = s.toUpperCase(); Matcher matcher = Pattern .compile( "^[AZ]{2}(20|21|22|23|[0-1]\\d)[0-5]\\d(20|21|22|23|[0-1]\\d)[0-5]\\d(T\\s|C\\s|TC|CT|\\s\\s)$") .matcher(s); if (matcher.find()) { // do something // then clear the textfield tf.clear(); } else { // do something else } } 

It works, but gives me an exception if a match matches.

An exception:

 Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: The start must be <= the end at javafx.scene.control.TextInputControl.getText(Unknown Source) at javafx.scene.control.TextInputControl.updateContent(Unknown Source) at javafx.scene.control.TextInputControl.replaceText(Unknown Source) at com.sun.javafx.scene.control.skin.TextFieldSkin.replaceText(Unknown Source) at com.sun.javafx.scene.control.behavior.TextFieldBehavior.replaceText(Unknown Source) at com.sun.javafx.scene.control.behavior.TextInputControlBehavior.defaultKeyTyped(Unknown Source) at com.sun.javafx.scene.control.behavior.TextInputControlBehavior.callAction(Unknown Source) at com.sun.javafx.scene.control.behavior.BehaviorBase.callActionForEvent(Unknown Source) at com.sun.javafx.scene.control.behavior.TextInputControlBehavior.callActionForEvent(Unknown Source) at com.sun.javafx.scene.control.behavior.BehaviorBase.lambda$new$75(Unknown Source) at com.sun.javafx.scene.control.behavior.BehaviorBase$$Lambda$88/1978656397.handle(Unknown Source) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source) at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source) at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source) at javafx.event.Event.fireEvent(Unknown Source) at javafx.scene.Scene$KeyHandler.process(Unknown Source) at javafx.scene.Scene$KeyHandler.access$1800(Unknown Source) at javafx.scene.Scene.impl_processKeyEvent(Unknown Source) at javafx.scene.Scene$ScenePeerListener.keyEvent(Unknown Source) at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(Unknown Source) at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleKeyEvent$349(Unknown Source) at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$349/1135388943.get(Unknown Source) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(Unknown Source) at com.sun.glass.ui.View.handleKeyEvent(Unknown Source) at com.sun.glass.ui.View.notifyKey(Unknown Source) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source) at com.sun.glass.ui.win.WinApplication$$Lambda$36/2117255219.run(Unknown Source) at java.lang.Thread.run(Unknown Source)} 

I already tried some sentences that I found here in other posts, for example, to check String before passing it to a match:

 if (!tf.getText() == null) { 

or

 if (!tf.getText().equals("") { 

but the exception remains. When I remove:

 tf.clear(); 

everything is working fine.

... any ideas anybody?

EDIT for swinkler solution:

the exception with the sources that I get when using the swinkler code is JDK 1.8.0_45:

 Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: The start must be <= the end at javafx.scene.control.TextInputControl.getText(TextInputControl.java:446) at javafx.scene.control.TextInputControl.updateContent(TextInputControl.java:564) at javafx.scene.control.TextInputControl.replaceText(TextInputControl.java:548) at com.sun.javafx.scene.control.skin.TextFieldSkin.replaceText(TextFieldSkin.java:576) at com.sun.javafx.scene.control.behavior.TextFieldBehavior.replaceText(TextFieldBehavior.java:202) at com.sun.javafx.scene.control.behavior.TextInputControlBehavior.defaultKeyTyped(TextInputControlBehavior.java:238) at com.sun.javafx.scene.control.behavior.TextInputControlBehavior.callAction(TextInputControlBehavior.java:139) at com.sun.javafx.scene.control.behavior.BehaviorBase.callActionForEvent(BehaviorBase.java:218) at com.sun.javafx.scene.control.behavior.TextInputControlBehavior.callActionForEvent(TextInputControlBehavior.java:127) at com.sun.javafx.scene.control.behavior.BehaviorBase.lambda$new$75(BehaviorBase.java:135) at com.sun.javafx.scene.control.behavior.BehaviorBase$$Lambda$91/476337053.handle(Unknown Source) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at javafx.event.Event.fireEvent(Event.java:198) at javafx.scene.Scene$KeyHandler.process(Scene.java:3965) at javafx.scene.Scene$KeyHandler.access$1800(Scene.java:3911) at javafx.scene.Scene.impl_processKeyEvent(Scene.java:2040) at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:2502) at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:197) at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:147) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleKeyEvent$349(GlassViewEventHandler.java:228) at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$142/181559839.get(Unknown Source) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:404) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:227) at com.sun.glass.ui.View.handleKeyEvent(View.java:546) at com.sun.glass.ui.View.notifyKey(View.java:956) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101) at com.sun.glass.ui.win.WinApplication$$Lambda$36/2117255219.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) 
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2 answers

I had the same problem and found a JDK-8081700 error report that solved the problem. It turns out this is not a mistake.

The test case tries to change the text property inside the change handler. This is not supported, and property event handlers are not a repeated participant.

The correct way is for the application to delay the modification using runLater ():

  if (matcher.find()) { System.err.println("true"); Platform.runLater(() -> { textField.clear(); }); } 
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I cannot get your error when using this in a simple JavaFX application. Here is the code I used to test your implementation. My test input "AA20552055T" matches the regular expression - the text field is cleared.

Can you compare with your solution:

 public class JavaFXApplication1 extends Application { @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml")); Scene scene = new Scene(root); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(args); } } 

Controller class with your logic:

 public class FXMLDocumentController implements Initializable { @FXML private TextField textfield; @Override public void initialize(URL url, ResourceBundle rb) { textfield.textProperty().addListener( (observable, oldValue, newValue) -> { handleInput(newValue); }); } private void handleInput(String s) { s = s.toUpperCase(); Matcher matcher = Pattern .compile( "^[AZ]{2}(20|21|22|23|[0-1]\\d)[0-5]\\d(20|21|22|23|[0-1]\\d)[0-5]\\d(T\\s|C\\s|TC|CT|\\s\\s)$") .matcher(s); if (matcher.find()) { // do something // then clear the textfield textfield.clear(); } else { // do something else } } } 

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.*?> <AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication1.FXMLDocumentController"> <children> <TextField layoutX="126" layoutY="150" fx:id="textfield" /> </children> </AnchorPane> 

As for the comment, I installed JDK 1.8.0_45 (up to 1.8.0_20) Working with Windows 7 x64 Again, no errors.

Here Netbeans jar is automatically created - I tested it from CMD. The work is also wonderful. Can you check if the jar file from CMD is working on your computer?

For debugging, this is a method in which the exception data is specified by the change parameter. change has start and end .

  private void updateContent(TextFormatter.Change change, boolean forceNewUndoRecord) { final boolean nonEmptySelection = getSelection().getLength() > 0; String oldText = getText(change.start, change.end); 

The start and end values โ€‹โ€‹then throw an exception in getText(...) :

  public String getText(int start, int end) { if (start > end) { throw new IllegalArgumentException("The start must be <= the end"); } if (start < 0 || end > getLength()) { throw new IndexOutOfBoundsException(); } return getContent().get(start, end); } 
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