StackOverflow2013

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I have the same problem. It looks like a bug. Here is a full working example with a <code>ComboBox</code> that contains <code>Locale</code>s: <pre><code>package org.example; import java.util.Arrays; import java.util.List; import java.util.Locale; import javafx.application.Application; import javafx.event.EventHandler; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.ComboBox; import javafx.scene.input.MouseEvent; import javafx.scene.layout.HBox; import javafx.stage.Stage; import javafx.util.StringConverter; public final class ComboBoxTest extends Application { @Override public void start(final Stage stage) throws Exception { // Initialize UI stage.setTitle("ComboBox Test"); final HBox root = new HBox(5.0f); final ComboBox<Locale> cbLocales = new ComboBox<>(); cbLocales.setConverter(new StringConverter<Locale>() { @Override public String toString(final Locale locale) { return locale.getDisplayName(); } @Override public Locale fromString(String string) { throw new UnsupportedOperationException(); } }); cbLocales.setPrefWidth(250); HBox.setMargin(cbLocales, new Insets(10)); root.getChildren().add(cbLocales); final Button btnFill = new Button("Fill"); HBox.setMargin(btnFill, new Insets(10)); root.getChildren().add(btnFill); final Scene scene = new Scene(root); stage.setScene(scene); btnFill.setOnMouseClicked(new EventHandler<MouseEvent>() { @Override public void handle(final MouseEvent event) { // Fill with content final List<Locale> locales = Arrays.asList(Locale.ENGLISH, Locale.GERMAN, Locale.FRENCH); final Locale defaultLocale = locales.get(1); // cbLocales.getItems.setAll(locales) doesn't work cbLocales.getItems().clear(); cbLocales.getItems().addAll(locales); // Set default locale cbLocales.setValue(defaultLocale); cbLocales.setPromptText(cbLocales.getConverter().toString( cbLocales.getValue())); } }); stage.show(); } public static void main(String[] args) { launch(args); } } </code></pre> When the <code>ComboBox</code> filled for the first time, all works fine: The <code>ComboBox</code> contains all 3 <code>Locale</code>s and the second <code>Locale</code> is set. <img src="https://i.stack.imgur.com/xjzuu.png" alt="enter image description here"> After filling a second time, <code>ComboxBox.setValue</code> doesn't work: The <code>ComboBox</code> contains all 3 <code>Locale</code>s but the second <code>Locale</code> is not set. No item is selected an no prompt is shown. <img src="https://i.stack.imgur.com/YThrl.png" alt="enter image description here"> I fixed the prompt problem with <pre><code>// Set default locale cbLocales.setValue(defaultLocale); cbLocales.setPromptText(cbLocales.getConverter().toString( cbLocales.getValue())); </code></pre> but it doesn't select the item in the list: <img src="https://i.stack.imgur.com/4AXPE.png" alt="enter image description here"> A work around is that: <pre><code>cbLocales.getSelectionModel().select(defaultLocale); cbLocales.setPromptText(cbLocales.getConverter().toString(cbLocales.getValue())); </code></pre> To select the item and set the prompt. But I don't know, if there are athor problems with that (tool tips or similar)
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