getting strange exception trying to implement asynchronous http in google app engine for java

Question

I'm trying to implement async http in java. Here is the important part of the code:

for (String urlString : urls) 
{ 
    // TODO: try and get rid of these two heap allocations 
    url = new URL(urlString); 
    request = new HTTPRequest(url); 
    request.addHeader(userAgentHeader); 
    request.addHeader(authorizationHeader); 
    request.addHeader(acceptEncodingHeader); 
    request.addHeader(acceptCharsetHeader); 
    responses.add(URLFetchServiceFactory.getURLFetchService().fetchAsync(reques t)); 
    apiCallsMade++; 
} 
for (Future<HTTPResponse> futureResponse : responses) 
{ 
    parseResponse(new String(futureResponse.get().getContent())); 
} 

I keep getting this error:

com.google.apphosting.api.ApiProxy$CallNotFoundException: The API package 'urlfetch' or call 'Fetch()' was not found.

I looked around for any jars that were missing from the classpath but didn't see anything missing. Do you know which jar that code is in? I googled the error and also searched through this group but found nothing. Thanks, David

Answer 1

Waitting for answers