MenuBar: fixed NPE in FlatMenuItemRenderer.getTopLevelFont() if men…

…u item does not have a parent (issue #600; regression since implementing #589 in FlatLaf 2.5; commit f6c5db0)

CHANGELOG.md

@@ -12,6 +12,9 @@ FlatLaf Change Log
 
 - ComboBox and Spinner: Fixed missing arrow buttons if preferred height is zero.
   Minimum width of arrow buttons is 3/4 of default width.
+- MenuBar: Fixed NPE in `FlatMenuItemRenderer.getTopLevelFont()` if menu item
+  does not have a parent. (issue #600; regression since implementing #589 in
+  FlatLaf 2.5)
 - TabbedPane: Switch and close tabs on left mouse click only. (PR #595)
 - ScrollBar: Show "pressed" feedback on track/thumb only for left mouse button.
   If absolute positioning is enabled (the default), then also for middle mouse

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemRenderer.java

@@ -500,7 +500,11 @@ protected boolean isUnderlineSelection() {
 
 	private Font getTopLevelFont() {
 		Font font = menuItem.getFont();
-		return (font != menuFont) ? font : menuItem.getParent().getFont();
+		// menu item parent may be null if JMenu.isTopLevelMenu() is overridden
+		// and does not check parent (e.g. com.jidesoft.swing.JideMenu.isTopLevelMenu())
+		return (font != menuFont || menuItem.getParent() == null)
+			? font
+			: menuItem.getParent().getFont();
 	}
 
 	private Icon getIconForPainting() {