diff -r 000000000000 -r e078953818d2 vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/Launcher.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/Launcher.java	Thu Dec 20 11:03:34 2012 +0100
@@ -0,0 +1,61 @@
+/**
+ * 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.vmtest;
+
+import org.apidesign.bck2brwsr.launcher.Bck2BrwsrLauncher;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class Launcher {
+    private final String sen;
+    private Bck2BrwsrLauncher launcher;
+    
+    Launcher() {
+        this(null);
+    }
+    Launcher(String sen) {
+        this.sen = sen;
+    }
+
+    synchronized Bck2BrwsrLauncher clear() {
+        Bck2BrwsrLauncher l = launcher;
+        launcher = null;
+        return l;
+    }
+
+    synchronized Bck2BrwsrLauncher.MethodInvocation addMethod(Class<?> clazz, String name) {
+        if (launcher == null) {
+            launcher = new Bck2BrwsrLauncher();
+            launcher.setTimeout(5000);
+            if (sen != null) {
+                launcher.setScriptEngineName(sen);
+            }
+        }
+        return launcher.addMethod(clazz, name);
+    }
+
+    void exec() throws Exception {
+        Bck2BrwsrLauncher l = clear();
+        if (l != null) {
+            l.execute();
+        }
+    }
+    
+}