Unable to open diagram with large Canvas

[prmr]

Description Depending on hardware, a large diagram size (set through View | Set Diagram Size) makes it look like nothing happens when a user attempts to create a new diagram or open any recent file that has too large a diagram size.

This problem is due to an underlying JavaFX bug. The workaround is to use a smaller diagram size. Alternatively, this Stack Overflow post provides an alternative that uses command-line arguments to the virtual machine.

Steps to reproduce It is only possible to reproduce this bug when JetUML is open on a display that cannot support the diagram size.

1. Open JetUML and click View | Set Diagram Size, select the max size.
2. Create a new Class diagram (for example)

The following exception will be raised by the graphics system:

java.lang.NullPointerException
	at javafx.graphics/com.sun.javafx.sg.prism.NGCanvas$RenderBuf.validate(NGCanvas.java:213)
	at javafx.graphics/com.sun.javafx.sg.prism.NGCanvas.initCanvas(NGCanvas.java:641)
	at javafx.graphics/com.sun.javafx.sg.prism.NGCanvas.renderContent(NGCanvas.java:604)
	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)

Configuration

• JetUML Release: 2.1 and up
• OS + version: Windows, Mac
• Java version: 14