src/java.desktop/share/classes/sun/font/SunFontManager.java

@@ -643,11 +643,11 @@
     protected PhysicalFont addToFontList(PhysicalFont f, int rank) {
     // MACOSX end
 
         String fontName = f.fullName;
         String familyName = f.familyName;
-        if (fontName == null || "".equals(fontName)) {
+        if (fontName == null || fontName.isEmpty()) {
             return null;
         }
         if (compositeFonts.containsKey(fontName)) {
             /* Don't register any font that has the same name as a composite */
             return null;