diff -r ba912ef24b27 -r d2401e2648af rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Wed Apr 30 15:04:10 2014 +0200
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Wed Apr 30 15:57:56 2014 +0200
@@ -486,6 +486,10 @@
                   "  return vm;\n"
                 + "  };\n"
                 + "  var extensions = [];\n"
+                + "  function mangleClass(name) {\n"
+                + "    return name.replace__Ljava_lang_String_2Ljava_lang_CharSequence_2Ljava_lang_CharSequence_2(\n"
+                + "      '_', '_1').replace__Ljava_lang_String_2CC('.','_');\n"
+                + "  };\n"
                 + "  global.bck2brwsr = function() {\n"
                 + "    var args = Array.prototype.slice.apply(arguments);\n"
                 + "    var resources = {};\n"
@@ -509,7 +513,7 @@
                 + "    var loader = {};\n"
                 + "    loader.vm = vm;\n"
                 + "    loader.loadClass = function(name) {\n"
-                + "      var attr = name.replace__Ljava_lang_String_2CC('.','_');\n"
+                + "      var attr = mangleClass(name);\n"
                 + "      var fn = vm[attr];\n"
                 + "      if (fn) return fn(false);\n"
                 + "      try {\n"
@@ -530,6 +534,12 @@
                 + "      throw 'Cannot initialize the bck2brwsr VM twice!';\n"
                 + "    }\n"
                 + "    vm.loadClass = loader.loadClass;\n"
+                + "    vm._reload = function(name, byteCode) {;\n"
+                + "      var attr = mangleClass(name);\n"
+                + "      delete vm[attr];\n"
+                + "      return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"
+                + "        reload__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2_3B(loader, name, args, byteCode);\n"
+                + "    };\n"
                 + "    vm.loadBytes = function(name, skip) {\n"
                 + "      if (resources[name]) return resources[name][0];\n"
                 + "      return vm.org_apidesign_vm4brwsr_VMLazy(false).\n"