FileChooser: catch NPE in Java 21 when getting icon for .exe files that use default Windows exe icon (see https://bugs.openjdk.org/browse/JDK-8320692)

CHANGELOG.md

@@ -19,12 +19,15 @@ FlatLaf Change Log
 
 - Button and ToggleButton: Selected buttons did not use explicitly set
   foreground color. (issue 756)
-- Table: Switching theme looses table grid and intercell spacing. (issues #733
-  and #750)
+- FileChooser: Catch NPE in Java 21 when getting icon for `.exe` files that use
+  default Windows exe icon. (see
+  [JDK-8320692](https://bugs.openjdk.org/browse/JDK-8320692))
 - OptionPane: Fixed styling custom panel background in `JOptionPane`. (issue
   #761)
 - ScrollPane: Styling ScrollPane border properties did not work if view
   component is a Table.
+- Table: Switching theme looses table grid and intercell spacing. (issues #733
+  and #750)
 - Table: Fixed background of `boolean` columns when using alternating row
   colors. (issue #780)
 - TableHeader: No longer temporary replace header cell renderer while painting.

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

@@ -370,7 +370,11 @@ public class FlatFileChooserUI
 
 			// get system icon
 			if( f != null ) {
+				try {
 					icon = getFileChooser().getFileSystemView().getSystemIcon( f );
+				} catch( NullPointerException ex ) {
+					// Java 21 may throw a NPE for exe files that use default Windows exe icon
+				}
 
 				if( icon != null ) {
 					if( icon instanceof ImageIcon )
@@ -540,6 +544,7 @@ public class FlatFileChooserUI
 			if( doNotUseSystemIcons() )
 				return new FlatFileViewDirectoryIcon();
 
+			try {
 				// Java 17+ supports getting larger system icons
 				try {
 					if( SystemInfo.isJava_17_orLater ) {
@@ -565,6 +570,10 @@ public class FlatFileChooserUI
 
 				// get system icon in default size 16x16
 				return fsv.getSystemIcon( file );
+			} catch( NullPointerException ex ) {
+				// Java 21 may throw a NPE for exe files that use default Windows exe icon
+				return new FlatFileViewDirectoryIcon();
+			}
 		}
 
 		protected void directoryChanged( File file ) {