[GTK] Nothing is rendered when creating new GC on canvas [EBZ#551982] --------------------------------------------------------------------- Key: ERT-765 URL: https://issues.jboss.org/browse/ERT-765 Project: Eclipse Release Train Issue Type: Task Components: Platform Reporter: Friendly Jira Robot Assignee: Eric Williams Priority: Major Labels: 4.14_M3, SWT, bzira This is example from http://www.java2s.com/Tutorial/Java/0300__SWT-2D-Graphics/Graphics.htm It shows empty window when run on Ubuntu 18.04 with open jdk 1.8 Mac and Windows works fine. Also works if use e.gc instead of new GC(...) It used to work before Swt used org.eclipse.swt.gtk.linux.x86_64_3.111.0.v20190605-1801.jar import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class GCCreateFrom { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Canvas Example"); shell.setLayout(new FillLayout()); final Canvas canvas = new Canvas(shell, SWT.NONE); canvas.addPaintListener(new PaintListener() { @Override public void paintControl(PaintEvent e) { GC gc = new GC(canvas); gc.setForeground(e.display.getSystemColor(SWT.COLOR_RED)); gc.drawFocus(5, 5, 200, 10); gc.drawText("You can draw text directly on a canvas", 60, 60); gc.dispose(); } }); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } }