Description
Most appropriate sub-area of Processing 4?
Core/Environment/Rendering
Processing version
4.4.4
Operating system
Windows 10
Steps to reproduce this
1. Description :
When dynamically resizing a Processing sketch window (via surface.setSize(w, h) or by enabling surface.setResizable(true)), a NullPointerException may occur in Component$BltBufferStrategy.revalidate(...), due to an internal backBuffers[] array being null.
This happens during the rendering phase, likely due to an invalidated or uninitialized BufferStrategy after the resize.
2. Example Stack Trace :
java.lang.NullPointerException: Cannot invoke "java.awt.image.VolatileImage.validate(java.awt.GraphicsConfiguration)" because "this.backBuffers[...]" is null
at java.desktop/java.awt.Component$BltBufferStrategy.revalidate(Component.java:4552)
at java.desktop/java.awt.Component$BltBufferStrategy.getDrawGraphics(Component.java:4449)
at processing.awt.PSurfaceAWT.render(PSurfaceAWT.java:242)
at processing.awt.PSurfaceAWT$9.callDraw(PSurfaceAWT.java:1389)
at processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:356)
3. Expected Behavior :
When resizing the window, either manually (with setResizable(true)) or programmatically (via surface.setSize(w, h)), the sketch should continue rendering smoothly without crashing or throwing an exception.
snippet
// Paste your code below :)
void setup() {
size(600, 400);
surface.setResizable(true);
}
void draw() {
background(200);
}Additional context
Discovered Workaround :
Calling surface.setVisible(true) immediately after resizing prevents the crash :
surface.setSize(w, h);
surface.setVisible(true); // Prevents the NPE
Would you like to work on the issue?
No