The screen turns blank when i resize the window in java3d

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Java

3D

Whenever I resize the window screen , it turns blank and the shape disappears.

What I have tried:

I tried adding : Toolkit.getDefaultToolkit().sync(); to refresh the canvas but it didn't work.
here is the code I added:
RefreshCanvas3D canvas3D =
new RefreshCanvas3D(config);

class RefreshCanvas3D extends Canvas3D {

public RefreshCanvas3D(GraphicsConfiguration config) {
super(config);
}

public void paint(Graphics g) {
super.paint(g);
Toolkit.getDefaultToolkit().sync();
}
}

Does anyone know what is the problem?