diff -r 223db336eed8 -r 87f66a77adf9 rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Mon Aug 11 18:17:47 2014 +0200
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Sun Aug 31 22:36:54 2014 +0200
@@ -1624,7 +1624,10 @@
 
         final String in = mi[0];
         String mcn;
-        if (callbacks && in.equals("org/apidesign/html/boot/spi/Fn")) {
+        if (callbacks && (
+            in.equals("org/apidesign/html/boot/spi/Fn") ||
+            in.equals("org/netbeans/html/boot/spi/Fn")
+        )) {
             mcn = "java_lang_Class";
         } else {
             mcn = mangleClassName(in);
@@ -1660,7 +1663,7 @@
         String mn = findMethodName(mi, cnt, returnType);
 
         final int numArguments = cnt.length() + 1;
-        final CharSequence[] vars = new CharSequence[numArguments];
+        final CharSequence[] vars =  new CharSequence[numArguments];
 
         for (int j = numArguments - 1; j >= 0; --j) {
             vars[j] = mapper.popValue();