diff -r 723d854272ae -r ed48023d1d85 launcher/src/main/java/org/apidesign/bck2brwsr/launcher/JSLauncher.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/JSLauncher.java	Sun Dec 23 17:02:34 2012 +0100
@@ -0,0 +1,116 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.launcher;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Enumeration;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.logging.Logger;
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+import org.apidesign.vm4brwsr.Bck2Brwsr;
+
+/**
+ * Tests execution in Java's internal scripting engine.
+ */
+public final class JSLauncher {
+    private static final Logger LOG = Logger.getLogger(JSLauncher.class.getName());
+    private Set<ClassLoader> loaders = new LinkedHashSet<>();
+    private final Res resources = new Res();
+    private Invocable code;
+    private Object console;
+    
+    
+    public MethodInvocation addMethod(Class<?> clazz, String method) {
+        loaders.add(clazz.getClassLoader());
+        MethodInvocation mi = new MethodInvocation(clazz.getName(), method);
+        try {
+            mi.result = code.invokeMethod(
+                console,
+                "invoke__Ljava_lang_String_2Ljava_lang_String_2Ljava_lang_String_2",
+                mi.className, mi.methodName).toString();
+        } catch (ScriptException scriptException) {
+            mi.exception = scriptException;
+        } catch (NoSuchMethodException noSuchMethodException) {
+            mi.exception = noSuchMethodException;
+        }
+        return mi;
+    }
+    
+    public void addClassLoader(ClassLoader url) {
+        this.loaders.add(url);
+    }
+
+    public void initialize() throws IOException {
+        try {
+            initRhino();
+        } catch (Exception ex) {
+            if (ex instanceof IOException) {
+                throw (IOException)ex;
+            }
+            if (ex instanceof RuntimeException) {
+                throw (RuntimeException)ex;
+            }
+            throw new IOException(ex);
+        }
+    }
+    
+    private void initRhino() throws IOException, ScriptException, NoSuchMethodException {
+        StringBuilder sb = new StringBuilder();
+        Bck2Brwsr.generate(sb, new Res());
+
+        ScriptEngineManager sem = new ScriptEngineManager();
+        ScriptEngine mach = sem.getEngineByExtension("js");
+
+        sb.append(
+              "\nvar vm = new bck2brwsr(org.apidesign.bck2brwsr.launcher.Console.read);"
+            + "\nfunction initVM() { return vm; };"
+            + "\n");
+
+        Object res = mach.eval(sb.toString());
+        if (!(mach instanceof Invocable)) {
+            throw new IOException("It is invocable object: " + res);
+        }
+        code = (Invocable) mach;
+        
+        Object vm = code.invokeFunction("initVM");
+        console = code.invokeMethod(vm, "loadClass", Console.class.getName());
+    }
+    
+    private class Res implements Bck2Brwsr.Resources {
+        @Override
+        public InputStream get(String resource) throws IOException {
+            for (ClassLoader l : loaders) {
+                URL u = null;
+                Enumeration<URL> en = l.getResources(resource);
+                while (en.hasMoreElements()) {
+                    u = en.nextElement();
+                }
+                if (u != null) {
+                    return u.openStream();
+                }
+            }
+            throw new IOException("Can't find " + resource);
+        }
+    }
+}