High CPU load when screen is off - Width (0) and height (0) cannot be <= 0 #8079
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shadowfly256
added
kind:bug
mbien
added
UI
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@shadowfly256 thanks a lot for taking your time and posting such detailed bug report. |
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I am wondering what your system does when all screens are unplugged. In my case it keeps at least one graphics device. public static void main(String[] args) {
JFrame frame = new JFrame("test");
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
new Thread(() -> {
while(true) {
try {
Thread.sleep(2000);
SwingUtilities.invokeLater(() -> {
List<GraphicsDevice> devices = List.of(GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices());
GraphicsConfiguration gc = frame.getGraphicsConfiguration();
System.out.println("s: %s, d: %s, gc: %s, devs: %s".formatted(frame.isShowing(), frame.isDisplayable(), gc, devices));
});
} catch (InterruptedException ex) {
return;
}
}
}).start();
}I unplugged both screens and the frame still had a graphics configuration and a device assigned. So I likely won't be able to reproduce this on gnome / cinnamon. (also NB 24 was doing fine running in the background without exceptions in the log) |
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For me, the output is just like it is for you: When i select this program in VisualVM, and turn the screen off, nothing happens. Somehow the Exceptions say NetBeans even though i made sure to close NetBeans. As for NetBeans: Widowing NetBeans does not protect it from the bug (at least not for me). So i don't know if these Exceptions are form the test program or VisualVM. Unfortunatley i don't know how to get the test program's exceptions without VisualVM. Journal while i turn the screen off: |
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I just tried to reproduce the bug on my laptop, but i was unable to reproduce it:
So maybe we need Wayland and or Plasma 6 for the bug to show up. |
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Apache NetBeans version
Apache NetBeans 24
What happened
I switched my monitor off to preserve some power while idling. My CPU started getting hot immediately. I looked at my TaskManager and found NetBeans using one CPU core at 100%.
I then used VisualVM to profile NetBeans to see if it's "easy" to fix, and the terminal output of VisualVM filled with exceptions like this:
Then i realized that both NetBeans and VisualVM's GUIs were glitching:
So i closed NetBeans, and switched off my screen. My CPU shot to 100% again. So yes, this bug is not NetBeans exclusive.
Without NetBeans or VisualVM my CPU remains cool.
Then i tried a simple Java GUI program, as i thought this might be a Java bug. But no, a simple Java JFrame does not create problems.
This is the reason why i did not report this to OpenJDK.
I hope this is not the wrong place for this bug. Maybe this should be an OpenJDK bug, but i am sure you can tell me.
Thanks for the awesome FOSS IDE by the way.
Language / Project Type / NetBeans Component
Java Ant application
How to reproduce
Did this work correctly in an earlier version?
No / Don't know
Operating System
Gentoo Linux 2.17 KDE Plasma Version: 6.2.4 Kernel Version: 6.6.62-gentoo
JDK
Gentoo host: openjdk 17.0.13 2024-10-15 >> NetBeans Flatpak: jdk21
Apache NetBeans packaging
Other
Anything else
NetBeans package: Flatpak - org.apache.netbeans//24
Reproducable: Always
VisualVM "source of load":
Are you willing to submit a pull request?
No
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