Description Mark McLaren 2021-05-03 20:01:15 EDT

When I show a PrintDialog then use the resulting PrinterData to create a print job it crashes the JVM.  This is affecting all my users on Mac Big Sur.

Here's an example:


package org.eclipse.swt.printing;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet132WithDialog {

public static void main (String [] args) {
	Display display = new Display();
	Shell shell = new Shell(display);
	shell.setText("Snippet 132 Modified");
	shell.open ();
	
	PrintDialog dialog = new PrintDialog(shell);
	final PrinterData printData = dialog.open();
	if (printData == null) {
		return;
	}
	

	Printer printer = new Printer(printData);
	System.out.println("Point A");
	if (printer.startJob("SWT Printing Snippet")) {
		System.out.println("Point B");
		Color black = printer.getSystemColor(SWT.COLOR_BLACK);
		Color white = printer.getSystemColor(SWT.COLOR_WHITE);
		Color red = printer.getSystemColor(SWT.COLOR_RED);
		Rectangle trim = printer.computeTrim(0, 0, 0, 0);
		Point dpi = printer.getDPI();
		int leftMargin = dpi.x + trim.x; // one inch from left side of paper
		if (leftMargin < 0) leftMargin = -trim.x;  // make sure to print on the printable area
		int topMargin = dpi.y / 2 + trim.y; // one-half inch from top edge of paper
		if (topMargin < 0) topMargin = -trim.y;  // make sure to print on the printable area
		GC gc = new GC(printer);
		if (printer.startPage()) {
			gc.setBackground(white);
			gc.setForeground(black);
			String testString = "Hello World!";
			Point extent = gc.stringExtent(testString);
			gc.drawString(testString, leftMargin, topMargin);
			gc.setForeground(red);
			gc.drawRectangle(leftMargin, topMargin, extent.x, extent.y);
			printer.endPage();
		}
		gc.dispose();
		printer.endJob();
	}
	printer.dispose();
	while (!shell.isDisposed ()) {
		if (!display.readAndDispatch ()) display.sleep ();
	}
	display.dispose();
}
}


In the output I can see 'Point A' but not 'Point B'.  Instead I get the following core dump: 

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007fff2059e650, pid=1966, tid=0x0000000000000103
#
# JRE version: Java(TM) SE Runtime Environment (8.0_162-b12) (build 1.8.0_162-b12)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.162-b12 mixed mode bsd-amd64 compressed oops)
# Problematic frame:
# C  [CoreFoundation+0x9650]  CFStringGetCString+0x254
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#