为什么我得到javafx.fxml.LoadException甚至fxml文件的路径都是正确的 [英] Why I'm getting javafx.fxml.LoadException even the path of the fxml file is correct
问题描述
我得到
javafx.fxml.LoadException:
javafx.fxml.LoadException:
当我使用以下代码行加载和fxml文件时。
When I'm loading and fxml file using following line of code.
AnchorPane anchorPane =(AnchorPane)加载程序。 load()
AnchorPane anchorPane = (AnchorPane)loader.load()
这是我的fxml文件,不包括import语句。
This is my fxml file excluding import statements.
<AnchorPane prefHeight="537.0" prefWidth="374.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.buddhikajay.controller.NewTransactionDialogController">
<children>
<GridPane hgap="5.0" layoutX="30.0" layoutY="10.0" prefHeight="544.0" prefWidth="314.0" vgap="5.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" maxWidth="142.0" minWidth="10.0" prefWidth="69.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="226.0" minWidth="10.0" prefWidth="225.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="70.0" minHeight="10.0" prefHeight="33.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="105.0" minHeight="10.0" prefHeight="38.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="156.0" minHeight="10.0" prefHeight="51.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="154.0" minHeight="10.0" prefHeight="43.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="160.0" minHeight="10.0" prefHeight="43.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="161.0" minHeight="10.0" prefHeight="63.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="301.0" minHeight="10.0" prefHeight="180.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="231.0" minHeight="10.0" prefHeight="106.0" vgrow="SOMETIMES" />
</rowConstraints>
<padding>
<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
</padding>
<children>
<Label text="ID" />
<Label text="Date" GridPane.rowIndex="1" />
<Label text="Amont" GridPane.rowIndex="2" />
<Label text="Person" GridPane.rowIndex="4" />
<Label text="Type" GridPane.rowIndex="3" />
<Label text="Resolved" GridPane.rowIndex="5" />
<Label />
<Label text="Description" GridPane.rowIndex="6" />
<TextField fx:id="idTextField" GridPane.columnIndex="1" />
<TextField fx:id="dateTextField" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<TextField fx:id="amountTextField" GridPane.columnIndex="1" GridPane.rowIndex="2" />
<TextArea fx:id="descriptionTextArea" prefHeight="200.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="6" />
<HBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="50.0" prefWidth="225.0" spacing="20.0" GridPane.columnIndex="1" GridPane.rowIndex="7">
<GridPane.margin>
<Insets />
</GridPane.margin>
<padding>
<Insets bottom="10.0" left="20.0" right="10.0" top="10.0" />
</padding>
<children>
<Button fx:id="okButton" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" onAction="#okActionFired" prefHeight="25.0" prefWidth="75.0" text="Ok" />
<Button fx:id="cancleButton" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" onAction="#cancleActionFired" prefHeight="25.0" prefWidth="75.0" text="Cancle" />
</children>
</HBox>
<ComboBox fx:id="typeComboBox" prefWidth="150.0" GridPane.columnIndex="1" GridPane.rowIndex="3" />
<ComboBox fx:id="personComboBox" prefWidth="150.0" GridPane.columnIndex="1" GridPane.rowIndex="4" />
<ComboBox fx:id="resolvedComboBox" prefWidth="150.0" GridPane.columnIndex="1" GridPane.rowIndex="5" />
</children>
</GridPane>
</children>
</AnchorPane>
编译器抱怨行号1有错误。我确定路径是fxml文件是正确的。我的代码出了什么问题?
The compiler complains that there is an error in line number 1. I'm sure that the path of fxml file is correct. What is wrong with my code?
这是完整的错误堆栈
javafx.fxml.LoadException:
/C:/Users/Buddhika/Documents/Programming/IdeaProjects/VirtualCreditDesktop/out/production/VirtualCreditDesktop/com/buddhikajay/view/NewTransactionDialog.fxml:9
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2595)
at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:104)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:928)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:967)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:216)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:740)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2701)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2521)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2435)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2403)
at com.buddhikajay.controller.NewTransactionDialogController.showNewTransactionDialog(NewTransactionDialogController.java:68)
at com.buddhikajay.controller.MainApp.start(MainApp.java:51)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
at com.sun.javafx.application.LauncherImpl$$Lambda$50/1976027283.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/301541210.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/474926796.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/1662429848.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda$38/519284171.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.InstantiationException: com.buddhikajay.controller.NewTransactionDialogController
at java.lang.Class.newInstance(Class.java:423)
at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:923)
... 23 more
Caused by: java.lang.NoSuchMethodException: com.buddhikajay.controller.NewTransactionDialogController.<init>()
at java.lang.Class.getConstructor0(Class.java:3074)
at java.lang.Class.newInstance(Class.java:408)
... 25 more
推荐答案
问题在堆栈跟踪中描述:
The problem is described in the stack trace:
Caused by: java.lang.NoSuchMethodException: com.buddhikajay.controller.NewTransactionDialogController.()
基本上说你的控制器class没有零参数构造函数。
which basically says your controller class doesn't have a zero-argument constructor.
默认情况下, FXMLLoader
将通过调用创建控制器它的零参数构造函数。删除在控制器类中定义的构造函数,或删除它所采用的参数。
By default, the FXMLLoader
will create the controller by calling its zero-argument constructor. Remove the constructor that you have defined in the controller class, or remove the parameters that it takes.
如果你真的需要将参数传递给控制器的构造函数,你可以用Java代码创建控制器并将其传递给FXMLLoader:
If you really need to pass arguments to the controller's constructor, you can either create the controller in Java code and pass it to the FXMLLoader:
NewTransactionDialogController controller = new NewTransactionDialogController(someValue);
FXMLLoader loader = new FXMLLoader();
loader.setLocation(...);
loader.setController(controller);
AnchorPane anchorPane = loader.load();
(使用此代码,您必须删除 fx:controller
属性。)
(Using this code, you must remove the fx:controller
attribute from the FXML.)
或者,设置一个控制器工厂:
Or, set a controller factory:
FXMLLoader loader = new FXMLLoader();
loader.setLocation(...);
loader.setControllerFactory(clazz -> {
if (clazz == NewTransactionDialogController.class) {
return new NewTransactionDialogController(someValue);
} else {
// default behavior:
try {
return clazz.newInstance();
} catch (Exception exc) {
throw new RuntimeException(exc);
}
}
});
AnchorPane anchorPane = loader.load();
(在此版本中,请保留 fx:controller
FXML文件中的属性。)
(In this version, leave the fx:controller
attribute in the FXML file.)
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