Some requests never make it to the callbacks function

Hi,

I am not sure if I am using the code the right way but here is what I see: some requests do not throw any exceptions in the client.execute() method but they never go in one of the callbacks methods success, cancelled or failed. Is this something you experienced?

I am using this code (extract):
SortedMap<String, Long> connectionsAliveTime = Collections.synchronizedSortedMap(new TreeMap<String, Long>());

IOReactorConfig ioConfig = new IOReactorConfig();
ioConfig.setConnectTimeout(15000);
ioConfig.setSoTimeout(15000);
ioConfig.setIoThreadCount(10);
DefaultConnectingIOReactor ioReactor = new DefaultConnectingIOReactor(ioConfig);
this.client = new DefaultHttpAsyncClient(new PoolingClientAsyncConnectionManager(ioReactor));

.....
client.execute(httpGet, callback);
Then just after the call to execute I put the url in a Map associated with a timestamp.
connectionsAliveTime.put(url, System.currentTimeMillis());

In all the three callback functions, I remove the url from the Map.

I run this on a lot of urls, and look each 30 seconds what I have in the Map (the Map is synchronized).
After 5 minutes, I see a lot of urls which are still in the Map for more than 2 minutes.

Can you tell me what you think of this ?

Thanks