Scene Builder中的自定义控件ClassNotFoundException [英] Custom Control ClassNotFoundException in Scene Builder

问题描述

我通过扩展现有控件创建了一个新控件，并且我想在JavaFX场景中使用此新控件.我希望能够使用Scene Builder编辑场景，但是将新控件添加到FXML文件后，在打开Scene Builder时遇到ClassNotFoundException.

I have created a new control by extending an existing one, and I would like to use this new control in my JavaFX scenes. I would like to be able to edit my scenes using Scene Builder, but after adding the new control to the FXML file, I am encountering a ClassNotFoundException when opening Scene Builder.

例如，这是我制作的扩展TextField的类:

For example, here is a class I made which extends TextField:

RegexLimitingTextField.java

public class RegexLimitingTextField extends TextField {

    private String regexLimiter = ".*";

    public void setRegexLimiter(String regex) {
        this.regexLimiter = regex;
    }

    @Override
    public void replaceText(int start, int end, String text) {
        if (text.matches(regexLimiter))
            super.replaceText(start, end, text);
    }

    @Override
    public void replaceSelection(String replacement) {
        if (replacement.matches(regexLimiter))
            super.replaceSelection(replacement);
    }
}

将此控件添加到我的FXML文件中之后...

After adding this control to my FXML file...

sample.fxml

<?import javafx.scene.layout.GridPane?>
<?import sample.RegexLimitingTextField?>
<GridPane fx:controller="sample.Controller"
          xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10">
    <RegexLimitingTextField fx:id="textField" text="Test" />
</GridPane>

...加载Scene Builder 2.0时出现此错误:

... I get this error when loading Scene Builder 2.0:

Caused by: java.lang.ClassNotFoundException: sample.RegexLimitingTextField
    at java.lang.ClassLoader.findClass(ClassLoader.java:530)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at javafx.fxml.FXMLLoader.loadTypeForPackage(FXMLLoader.java:2920)
    at javafx.fxml.FXMLLoader.loadType(FXMLLoader.java:2909)
    at javafx.fxml.FXMLLoader.importClass(FXMLLoader.java:2850)
    ... 23 more

Scene Builder为什么找不到我的新控件?我需要做什么才能使其能够找到并使用我的新控件?

Why can't Scene Builder find my new control? What do I need to do in order for it to find and be able to use my new control?

如果需要，这里还有其他文件:

Here are the other files if needed:

Main.java

public class Main extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setScene(new Scene(root, 200, 200));
        primaryStage.show();
    }
}

Controller.java

public class Controller implements Initializable {
    public RegexLimitingTextField textField;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        textField.setRegexLimiter("\\w*");
    }
}

推荐答案

如果仍然有人无法使用SceneBuilder加载其自定义组件，只需传递ClassLoader即可为我解决该问题.

If anyone is still having troubles with SceneBuilder not loading their custom components, simply passing on a ClassLoader solved the issue for me.

try {
    FXMLLoader loader = new FXMLLoader(getClass().getResource("CustomComponent.fxml"));
    loader.setRoot(this);
    loader.setController(this);
    loader.setClassLoader(getClass().getClassLoader());
    loader.load();
} catch (IOException e ){
    throw new RuntimeException(e);
}

信贷转到神奇的工人，那个javaguy .

这篇关于Scene Builder中的自定义控件ClassNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！