I successfully made a simple JavaFX FXML program (in pre-Java 9 style, not module) I used 3 files and the main class as below:
└───javafxfxmldemo
FXMLDocument.fxml
FXMLDocumentController.java
JavaFXFXMLDemo.java
Main class
public class JavaFXFXMLDemo 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);
}
}
It works perfectly both in NetBeans 9 and in DOS terminal with javac and java.
Now, I tried to make the same program in Java modules. Below is my source structure:
└───src
└───com.fxmlapp
│ module-info.java
│
└───com
└───fxmlapp
FXEventModuleDemo.java
FXMLDocument.fxml
FXMLDocumentController.java
module-info.java
module com.fxmlapp {
requires javafx.controls;
requires javafx.fxml;
exports com.fxmlapp;
}
All the rest of code is identical except the main class name.
It compiles in NetBeans 9 and I also could compile in DOS terminal as below:
javac -d mods\com.fxmlapp --module-path %PATH_TO_FX% src\com.fxmlapp\module-info.java src\com.fxmlapp\com\fxmlapp\FXEventModuleDemo.java src\com.fxmlapp\com\fxmlapp\FXMLDocumentController.java
After compilation, I placed the FXMLDocument.fxml file in the mods directory as below.
├───mods
│ └───com.fxmlapp
│ │ module-info.class
│ │
│ └───com
│ └───fxmlapp
│ FXEventModuleDemo.class
│ FXMLDocument.fxml
│ FXMLDocumentController.class
│
└───src
└───com.fxmlapp
│ module-info.java
│
└───com
└───fxmlapp
FXEventModuleDemo.java
FXMLDocument.fxml
FXMLDocumentController.java
But, it fails to run. I tried both in NetBeans 9 and in DOS terminal as below:
java --module-path %PATH_TO_FX%;mods -m com.fxmlapp/com.fxmlapp.FXEventModuleDemo
The error comes from the statement:
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
I know, there are many posts with this issue, but I couldn't find a solution to this when the error occurs in java modules. I don't think it is the file location issue because below statement works.
System.out.println(getClass().getResource("FXMLDocument.fxml"));
FXMLLoader.load() seems doesn't work in modules.
If it works in non-module style, I believe it must work in modules too.
The actual error message is as below; Yes, I saw many questions asking with this error, but I still couldn't find a solution with java modules) Did I do something wrong with my module-info.java or my compile or run commands?
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: javafx.fxml.LoadException:
/D:/OpenJFX_Demo/FXEventModuleDemo/mods/com.fxmlapp/com/fxmlapp/FXMLDocument.fxml:14
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2603)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3237)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
at com.fxmlapp/com.fxmlapp.FXEventModuleDemo.start(FXEventModuleDemo.java:13)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private javafx.scene.control.Label com.fxmlapp.FXMLDocumentController.label accessible: module com.fxmlapp does not "opens com.fxmlapp" to module javafx.fxml
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:176)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:170)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerAccessor.addAccessibleFields(FXMLLoader.java:3479)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerAccessor.access$3900(FXMLLoader.java:3328)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerAccessor$1.run(FXMLLoader.java:3444)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerAccessor$1.run(FXMLLoader.java:3440)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerAccessor.addAccessibleMembers(FXMLLoader.java:3439)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerAccessor.getControllerFields(FXMLLoader.java:3378)
at javafx.fxml/javafx.fxml.FXMLLoader.injectFields(FXMLLoader.java:1170)
at javafx.fxml/javafx.fxml.FXMLLoader.access$1600(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processValue(FXMLLoader.java:865)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:759)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
... 17 more
Exception running application com.fxmlapp.FXEventModuleDemo
As explained by @nullpointer:
The error says module com.fxmlapp does not "opens com.fxmlapp" to module javafx.fxml.
So, I added --add-opens com.fxmlapp/com.fxmlapp=javafx.fxml. It solveed the problem.