diff -r 25e350c6385f -r dde8422fb5ae vm/src/test/java/org/apidesign/vm4brwsr/Classes.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/Classes.java	Sat Dec 01 08:52:30 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/Classes.java	Sat Dec 01 15:48:12 2012 +0100
@@ -47,7 +47,11 @@
     public static String canonicalName() {
         return IOException.class.getCanonicalName();
     }
-    public static IOException newInstance() throws InstantiationException, IllegalAccessException {
-        return IOException.class.newInstance();
+    public static boolean newInstance() throws Exception {
+        IOException ioe = IOException.class.newInstance();
+        if (ioe instanceof IOException) {
+            return ioe.getClass() == IOException.class;
+        }
+        throw new IllegalStateException("Not a subtype: " + ioe);
     }
 }