ADDITIONAL SYSTEM INFORMATION :
Windows 10

A DESCRIPTION OF THE PROBLEM :
"java.lang.NullPointerException" when width or height of a Canvas is bigger than 8192 .

ERROR MESSAGES/STACK TRACES THAT OCCUR : 
java.lang.NullPointerException
	at javafx.graphics/com.sun.javafx.sg.prism.NGCanvas$RenderBuf.validate(NGCanvas.java:214)
	at javafx.graphics/com.sun.javafx.sg.prism.NGCanvas.initCanvas(NGCanvas.java:644)
	at javafx.graphics/com.sun.javafx.sg.prism.NGCanvas.renderContent(NGCanvas.java:607)
	at javafx.graphics/com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072)
	at javafx.graphics/com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964)
	at javafx.graphics/com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:270)
	at javafx.graphics/com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:579)
	at javafx.graphics/com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2072)
	at javafx.graphics/com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1964)
	at javafx.graphics/com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:479)
	at javafx.graphics/com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:328)
	at javafx.graphics/com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:91)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
	at javafx.graphics/com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at javafx.graphics/com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
	at java.base/java.lang.Thread.run(Thread.java:832)


REGRESSION : Last worked in version 14.0.2

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
This bug can be reproduced always. 

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no exception
ACTUAL -
has exception

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class Test extends Application {
	@Override
	public void start(Stage primaryStage) {
		AnchorPane root = new AnchorPane();

		Canvas canvas = new Canvas(8193, 1);
		root.getChildren().add(canvas);

		Scene scene = new Scene(root, 400, 400);
		primaryStage.setScene(scene);
		primaryStage.show();
	}

	public static void main(String[] args) {
		launch(args);
	}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
no workaround!

FREQUENCY : always