diff -r 9839e9a75bcf -r add357fd6c5c vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/impl/GenerateZipProcessor.java
--- a/vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/impl/GenerateZipProcessor.java	Wed Jan 30 14:03:49 2013 +0100
+++ b/vmtest/src/main/java/org/apidesign/bck2brwsr/vmtest/impl/GenerateZipProcessor.java	Tue Feb 05 13:20:07 2013 +0100
@@ -25,6 +25,7 @@
 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;
@@ -73,7 +74,8 @@
     }
 
     private void generateJar(PackageElement pe, GenerateZip gz, Element e) throws IOException {
-        FileObject res = processingEnv.getFiler().createResource(
+        final Filer filer = processingEnv.getFiler();
+        FileObject res = filer.createResource(
             StandardLocation.CLASS_OUTPUT, 
             pe.getQualifiedName().toString(), 
             gz.name(), e
@@ -93,6 +95,7 @@
             jar.write(arr[i + 1].getBytes("UTF-8"));
             jar.closeEntry();
         }
+        jar.close();
     }
-    
+
 }