apache / apache/netbeans

JavaFX never works

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Ant JavaFX kind:bug
Dominant language
Java
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Description

### Apache NetBeans version

Apache NetBeans 17

### What happened

No matter what type of JavaFX code I run, I get this error.

```
ant -f C:\\Users\\marog\\OneDrive\\Documents\\NetBeansProjects\\AssignmentThirteen -Dnb.internal.action.name=run.single -Djavac.includes=assignmentthirteen/AssignmentThirteen.java -Drun.class=assignmentthirteen.AssignmentThirteen run-single
init:
Deleting: C:\Users\marog\OneDrive\Documents\NetBeansProjects\AssignmentThirteen\build\built-jar.properties
deps-jar:
Updating property file: C:\Users\marog\OneDrive\Documents\NetBeansProjects\AssignmentThirteen\build\built-jar.properties
Compiling 1 source file to C:\Users\marog\OneDrive\Documents\NetBeansProjects\AssignmentThirteen\build\classes
compile-single:
run-single:
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:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:465)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:364)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1082)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:901)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.ClassFormatError: Incompatible magic value 791285002 in class file assignmentthirteen/FXMLDocumentController
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:931)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:981)
at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:230)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:755)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2808)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2634)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3331)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3287)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3255)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3227)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3203)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3196)
at assignmentthirteen.AssignmentThirteen.start(AssignmentThirteen.java:22)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:847)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$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:184)
... 1 more
Exception running application assignmentthirteen.AssignmentThirteen
C:\Users\marog\OneDrive\Documents\NetBeansProjects\AssignmentThirteen\nbproject\build-impl.xml:1367: The following error occurred while executing this line:
C:\Users\marog\OneDrive\Documents\NetBeansProjects\AssignmentThirteen\nbproject\build-impl.xml:962: Java returned: 1
BUILD FAILED (total time: 1 second)
```

### How to reproduce

_No response_

### Did this work correctly in an earlier version?

Apache NetBeans 16

### Operating System

Windows 10

### JDK

Netbeans IDE 17

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

It happens everytime after it worked the first time.

### Are you willing to submit a pull request?

No

Contributor guide

Open the contributing guide

Research direction

Reproduce the JavaFX run-single failure in Apache NetBeans 17 on Windows 10 using the stack trace and the reported AssignmentThirteen.java:22 entry point. Inspect the generated nbproject/build-impl.xml locations cited in the failure and compare behavior with NetBeans 16. Done means identifying a project or IDE cause and confirming that the JavaFX application runs repeatedly.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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