So I am making a javafx application and very rarely when I run the application and interact with the UI a bit I would get the exception in the attached file. And not only once, it would throw this exception constantly until I terminated the application. I would give some piece of code but the code is pretty extensive and this exception doesn't really tell me much at all. Does anyone perhaps know what could potentially cause this?
#weird javafx exception
hushed gulch
marble wyvernBOT
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hushed gulch
oh also I am using CSS
scene.getStylesheets().add(JFXPlayer.class.getResource("styles.css").toExternalForm());
slider.getStyleClass().add("slider");
slider.valueProperty().addListener((observable, oldValue, newValue) -> {
double bufferPercent =(double) grabberExecutor.getBufferPosition()/(double) grabberExecutor.getLengthInTime()*100.0;
double percentage = 100.0 * newValue.doubleValue() / slider.getMax();
String style = String.format(
"-track-color: linear-gradient(to right, " +
"-fx-accent 0%%, " +
"-fx-accent %1$.1f%%, " +
"gray %1$.1f%%, "+
"gray %2$.1f%%, "+
"-default-track-color %2$.1f%%, " +
"-default-track-color 100%%);"
,
percentage,bufferPercent);
slider.setStyle(style);
});
this is basically all the CSS code
.slider {
-default-track-color: -fx-control-inner-background;
-track-color: white ;
-fx-transition: -fx-translate-x 1s;
-fx-accent: red;
-fx-background-color: transparent;
-fx-padding: 10px;
}
.slider .thumb {
-fx-background-color: transparent; /* Or match the track's background color */
-fx-background-radius: 0; /* Set border radius to 0 to remove any visible border */
-fx-padding: 0;
}
.slider .track{
-fx-background-color: -track-color;
}
this here is my css file
I am suspecting CSS because I feel like this started happening after I added css although I can't say I'm 100% certain, I can't really remember all that well but I think it might be the case
grim lance
if you comment out the css is it still happening?
marble wyvernBOT
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hushed gulch
if you comment out the css is it still happening?
I would hardly know to be honest. As I said it happens very rarely, like once every 50 times I run the program probably
or even less often
also sorry for slow response I went to bed shortly after posting
grim lance
from what I'm getting from this error you are running a loop somewhere that sometimes goes to -1 for some reason. It's on the main thread so it is probably display logic (unless you've done everything on that main thread which is a big no-no). You'd have to figure out why it's happening and that's your job 60% done.
hushed gulch
the main thread? Isn't it the javafx application thread? Or are they basically equivalent in a javafx application
also every part of this stack trace is internal to the jdk
there's nothing on the stack trace that's my method
grim lance
the main thread? Isn't it the javafx application thread? Or are they basically e...
yes that's what I was referring to
grim lance
there's nothing on the stack trace that's my method
that's bad. Would be even harder to figure out why this is happening
hushed gulch
that's bad. Would be even harder to figure out why this is happening
that's exactly the problem
if it was something caused by a method of mine than okay but there is literally nothing on the stack trace that's mine
okay I was again doing some stuff and left the program to run and after some time I got this:
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.layout.Background.getFills()" because the return value of "javafx.scene.layout.StackPane.getBackground()" is null
at javafx.scene.control.skin.SliderSkin.layoutChildren(SliderSkin.java:196)
at javafx.scene.control.Control.layoutChildren(Control.java:612)
at javafx.scene.Parent.layout(Parent.java:1208)
at javafx.scene.Parent.layout(Parent.java:1215)
at javafx.scene.Scene.doLayoutPass(Scene.java:594)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2596)
at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:398)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:397)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:427)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:592)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:572)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:565)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:352)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:185)
at java.base/java.lang.Thread.run(Thread.java:1623)
a different exception
again with no methods on my end ;-;
for now I'll open a new issue about using css this way and see if that could potentially cause problems/ if there is a better way
marble wyvernBOT
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hushed gulch
okay. I found out the problem. Turns out when a thread changes the value property of a slider it is the one that also handles the callback of that value property change. I thought it was the javafx application thread that handles all the callbacks for events but apparently not this one. It would have been nice to know god damnit.
anyway,thanks
marble wyvernBOT
anyway,thanks
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