when i use the add() method of ConcurrentUpdateSolrServer to add documents to a solr server which is disconnect,i found the status of response is 0 (i think status is not 0);
Although your context is not really clear, be aware that the ConcurrentUpdateSolrServer is adding documents in a asynch + buffered way (by means of an internal blocking queue and several dequeueing threads) so that could be the reason why you miss something in case of a server disconnection....but it's a shot in the dark