Skip response closing and writing if the response was already written

and committed by the application.

src/helma/framework/ResponseTrans.java

@@ -462,6 +462,13 @@ public final class ResponseTrans implements Serializable {
      * web server. Transforms the string buffer into a char array to minimize size.
      */
     public synchronized void close(String cset) throws UnsupportedEncodingException {
+        // if the response was already written and committed by the application
+        // there's no point in closing the response buffer
+        HttpServletResponse res = reqtrans.getServletResponse();
+        if (res != null && res.isCommitted()) {
+            return;
+        }
+
         // only use default charset if not explicitly set for this response.
         if (charset == null) {
             charset = cset;

src/helma/servlet/AbstractServletClient.java

@@ -253,6 +253,12 @@ public abstract class AbstractServletClient extends HttpServlet {
 
             ResponseTrans restrans = getApplication().execute(reqtrans);
 
+            // if the response was already written and committed by the application
+            // we can skip this part and return
+            if (response.isCommitted()) {
+                return;
+            }
+
             // set cookies
             if (restrans.countCookies() > 0) {
                 CookieTrans[] resCookies = restrans.getCookies();