diff -r f30e2afc8ddb -r b07c7c256771 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Sep 28 12:58:20 2012 +0200
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Sep 28 14:45:00 2012 +0200
@@ -355,6 +355,9 @@
                 case bc_i2s:
                     out.append("/* number conversion */");
                     break;
+                case bc_aconst_null:
+                    out.append("stack.push(null);");
+                    break;
                 case bc_iconst_0:
                 case bc_dconst_0:
                 case bc_lconst_0:
@@ -485,7 +488,10 @@
                     i += 2;
                     break;
                 }
-                case bc_invokeinterface:
+                case bc_invokeinterface: {
+                    i = invokeVirtualMethod(byteCodes, i) + 2;
+                    break;
+                }
                 case bc_invokevirtual:
                     i = invokeVirtualMethod(byteCodes, i);
                     break;