src/jdk.packager/share/classes/jdk/packager/internal/Arguments.java

*** 276,287 ****
              String icon = initialMap.get(FA_ICON);
              if (icon != null) {
                  args.put(StandardBundlerParam.FA_ICON.getID(), icon);
              }
  
              // check that we really add _another_ value to the list
!             setOptionValue("file-associations", args);
          }),
  
          SECONDARY_LAUNCHER ("secondary-launcher",
                      OptionCategories.PROPERTY, () -> {
              context().secondaryLaunchers.add(
--- 276,293 ----
              String icon = initialMap.get(FA_ICON);
              if (icon != null) {
                  args.put(StandardBundlerParam.FA_ICON.getID(), icon);
              }
  
+             ArrayList<Map<String, ? super Object>> associationList =
+                 new ArrayList<Map<String, ? super Object>>();
+ 
+             associationList.add(args);
+ 
              // check that we really add _another_ value to the list
!             setOptionValue("file-associations", associationList);
! 
          }),
  
          SECONDARY_LAUNCHER ("secondary-launcher",
                      OptionCategories.PROPERTY, () -> {
              context().secondaryLaunchers.add(