问题描述
关于这个主题还有其他几个问题,但它们都使用放置在包中的文件,与我的不同。我有三个简单的文件:
(所有文件都在同一个文件夹中)
我(从堆栈竞赛中)推断出错误是因为 FXMLLoader
无法定位 Bean
,它位于 view2.fxml
中的场景图上。也许这与不使用包有关。如果是这样,我只想知道为什么需要包。下面给出了三个文件和堆栈跟踪。
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.fxml.FXMLLoader;
public class FXMLtest extends Application
{
@Override
public void start(Stage stage) throws Exception
{
Scene scene = new Scene(FXMLLoader.load(getClass().getResource("view2.fxml")),300,100);
stage.setTitle("JavaFX Example");
stage.setScene(scene);
stage.show();
}
public static void main (String[] args){
launch(args);
}
}
import javafx.scene.control.Button;
import javafx.beans.property.SimpleDoubleProperty;
public class Bean extends Button{
private SimpleDoubleProperty foo;
Bean(){
super();
}
void setFoo(double x){
foo.set(x);
}
double getFoo(){
return foo.get();
}
SimpleDoubleProperty fooproperty(){
return foo;
}
}
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.control.Button?>
<?import Bean?>
<Pane prefheight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml" >
<children>
<Button text="testButton" />
<Bean foo="4.4" text="button2" />
</children>
</Pane>
Exception in Application start method
Exception in thread "JavaFX BlueJ Helper" java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException:
/C:/java/view2.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.importClass(FXMLLoader.java:2848)
at javafx.fxml.FXMLLoader.processImport(FXMLLoader.java:2692)
at javafx.fxml.FXMLLoader.processprocessingInstruction(FXMLLoader.java:2661)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2517)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at FXMLtest.start(FXMLtest.java:10)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.invokelaterdispatcher$Future.run(invokelaterdispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
... 1 more
Caused by: java.lang.classNotFoundException
at javafx.fxml.FXMLLoader.loadType(FXMLLoader.java:2899)
at javafx.fxml.FXMLLoader.importClass(FXMLLoader.java:2846)
... 20 more
解决方法
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