diff -r add357fd6c5c -r d382dacfd73f rt/vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/impl/GenerateZipProcessor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/impl/GenerateZipProcessor.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,101 @@
+/**
+ * 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.impl;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Set;
+import java.util.jar.JarEntry;
+import java.util.jar.JarOutputStream;
+import java.util.jar.Manifest;
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.Filer;
+import javax.annotation.processing.Processor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ElementKind;
+import javax.lang.model.element.PackageElement;
+import javax.lang.model.element.TypeElement;
+import javax.tools.Diagnostic;
+import javax.tools.FileObject;
+import javax.tools.StandardLocation;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+@ServiceProvider(service = Processor.class)
+@SupportedAnnotationTypes("org.apidesign.bck2brwsr.vmtest.impl.GenerateZip")
+public class GenerateZipProcessor extends AbstractProcessor {
+
+    @Override
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        for (Element e : roundEnv.getElementsAnnotatedWith(GenerateZip.class)) {
+            GenerateZip gz = e.getAnnotation(GenerateZip.class);
+            if (gz == null) {
+                continue;
+            }
+            PackageElement pe = findPackage(e);
+            try {
+                generateJar(pe, gz, e);
+            } catch (IOException ex) {
+                processingEnv.getMessager().printMessage(
+                    Diagnostic.Kind.ERROR, 
+                    "Can't generate JAR " + gz.name() + ": " + ex.getMessage()
+                );
+            }
+        }
+        return true;
+    }
+
+    private static PackageElement findPackage(Element e) {
+        while (e.getKind() != ElementKind.PACKAGE) {
+            e = e.getEnclosingElement();
+        }
+        return (PackageElement)e;
+    }
+
+    private void generateJar(PackageElement pe, GenerateZip gz, Element e) throws IOException {
+        final Filer filer = processingEnv.getFiler();
+        FileObject res = filer.createResource(
+            StandardLocation.CLASS_OUTPUT, 
+            pe.getQualifiedName().toString(), 
+            gz.name(), e
+        );
+        OutputStream os = res.openOutputStream();
+        JarOutputStream jar;
+        if (gz.manifest().isEmpty()) {
+            jar = new JarOutputStream(os);
+        } else {
+            Manifest mf = new Manifest(new ByteArrayInputStream(gz.manifest().getBytes("UTF-8")));
+            jar = new JarOutputStream(os, mf);
+        }
+        String[] arr = gz.contents();
+        for (int i = 0; i < arr.length; i += 2) {
+            JarEntry je = new JarEntry(arr[i]);
+            jar.putNextEntry(je);
+            jar.write(arr[i + 1].getBytes("UTF-8"));
+            jar.closeEntry();
+        }
+        jar.close();
+    }
+
+}