--- a/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/PluginsResourceBundle.java	Thu Apr 25 17:27:37 2019 +0100
+++ b/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/PluginsResourceBundle.java	Thu Mar 14 14:04:39 2019 +0100
@@ -62,7 +62,11 @@
     }
 
     public static String getMessage(String key, Object... args) throws MissingResourceException {
-        String val = pluginsBundle.getString(key);
+        return getMessage(pluginsBundle, key, args);
+    }
+
+    public static String getMessage(ResourceBundle bundle, String key, Object... args) throws MissingResourceException {
+        String val = bundle.getString(key);
         return MessageFormat.format(val, args);
     }
 }