帶有監聽器的JavaFX Textfield給出：“java.lang.IllegalArgumentException：start必須<= the end”

Question

我得到一個例外，不明白是什么原因造成的。 這是一個FXML文件的FX應用程序。 在App的init（）部分，我將一個監聽器添加到一個文本字段，該文本字段調用一個函數，該函數使用模式的正則表達式監視String。

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

功能：

private void handleInput(String s) {

            s = s.toUpperCase();
            Matcher matcher = Pattern
                    .compile(
                            "^[A-Z]{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
                }
            }

它有效，但在匹配匹配的情況下給我一個例外。

例外：

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)}

我已經嘗試了一些我在其他帖子中找到的建議，比如在將它提供給匹配器之前檢查字符串：

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

要么

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

但例外仍然存在。 當我刪除：

tf.clear();

一切正常。

......有什么想法嗎？

編輯swinkler的解決方案：

使用swinkler代碼時得到的異常 - 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)

Answer 1

我有同樣的問題 ，發現了錯誤報告JDK-8081700 ，解決了這個問題。 事實證明不是一個錯誤。

測試用例嘗試修改更改處理程序內的text屬性。 這不受支持，並且屬性事件處理程序不可重入。

正確的方法是應用程序使用runLater（）延遲修改：

  if (matcher.find()) { System.err.println("true"); Platform.runLater(() -> { textField.clear(); }); } 

Answer 2

在簡單的JavaFX應用程序中使用它時，我無法得到您的錯誤。 這是我用來測試你的實現的代碼。 我的測試輸入是“AA20552055T”以匹配正則表達式 - 文本字段被清除。

您能否與您的解決方案進行比較：

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類與您的邏輯：

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(
                        "^[A-Z]{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文件：

<?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>

關於評論，我安裝了JDK 1.8.0_45（在1.8.0_20之前）在Windows 7 x64上工作再次，沒有錯誤。

這是 Netbeans自動創建的jar - 我是從CMD測試的。 工作也很好。 你能測試從CMD執行的jar文件是否在你的機器上正常工作？

對於調試 - 這是由change參數給出異常數據的方法。 變化有一個start和end 。

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

然后，start和end值在getText(...)觸發異常：

 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);
    }