--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/resources/fx/base.js	2017-01-10 14:11:14.000000000 +0530
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/resources/fx/base.js	2017-01-10 14:11:14.000000000 +0530
@@ -108,7 +108,7 @@
         }
     });
 
-    Files.walkFileTree(rootDirectories[0], new JRTFSWalker());
+    Files.walkFileTree(rootDirectories.toArray()[0], new JRTFSWalker());
 })();
 
 LOAD_FX_CLASSES(this, "javafx.base");