diff -r ba912ef24b27 -r d6d1fc565854 rt/emul/mini/src/main/java/java/lang/Class.java
--- a/rt/emul/mini/src/main/java/java/lang/Class.java	Wed Apr 30 15:04:10 2014 +0200
+++ b/rt/emul/mini/src/main/java/java/lang/Class.java	Thu May 01 13:43:36 2014 +0200
@@ -35,6 +35,7 @@
 import java.lang.reflect.TypeVariable;
 import java.net.URL;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
+import org.apidesign.bck2brwsr.core.JavaScriptOnly;
 import org.apidesign.bck2brwsr.emul.reflect.AnnotationImpl;
 import org.apidesign.bck2brwsr.emul.reflect.MethodImpl;
 
@@ -1773,5 +1774,20 @@
             + "\n}"
     )
     static native Object clone(Object self) throws CloneNotSupportedException;
-    
+
+    @JavaScriptOnly(name = "toJS", value = "function(v) {\n"
+        + "  if (v === null) return null;\n"
+        + "  if (Object.prototype.toString.call(v) === '[object Array]') {\n"
+        + "    return vm.org_apidesign_bck2brwsr_emul_lang_System(false).convArray__Ljava_lang_Object_2Ljava_lang_Object_2(v);\n"
+        + "  }\n"
+        + "  return v.valueOf();\n"
+        + "}\n"
+    )
+    static native int toJS();
+
+    @JavaScriptOnly(name = "activate__Ljava_io_Closeable_2Lorg_apidesign_html_boot_spi_Fn$Presenter_2", value = "function() {\n"
+        + "  return vm.org_apidesign_bck2brwsr_emul_lang_System(false).activate__Ljava_io_Closeable_2();"
+        + "}\n"
+    )
+    static native int activate();
 }