java.lang.NullPointerException

Hi,

I'm trying to implement asyncSearch and searchNextAsync in C#. Please take a look at my code below and tell me what is wrong with it, or why it is causing the Java(?) NullPointerException.

Occurs randomly during one of the iterations of the while loop, on the line:  service.searchNextAsync();

Thanks, Sebastian

 // starting search procedure              AsyncStatusResult result = service.asyncSearch(itemSearch);                String jobId = result.jobId;                while (service.checkAsyncStatus(jobId).status != AsyncStatusType.finished)                  //&& service.checkAsyncStatus(jobId).status != AsyncStatusType.failed                  //&& service.checkAsyncStatus(jobId).status != AsyncStatusType.finishedWithErrors)              {                  Thread.Sleep(1000 * 60);                              }                AsyncSearchResult asr = (AsyncSearchResult)service.getAsyncResult(jobId, 1);                while (asr.searchResult.pageIndex <= asr.searchResult.totalPages)              {                  logger.LogString(asr.searchResult.pageIndex + " of " + asr.searchResult.totalPages + " loaded...");                    foreach (Record record in asr.searchResult.recordList)                  {                      // some code                                      } // foreach                                    service.searchNextAsync();                    while (service.checkAsyncStatus(jobId).status != AsyncStatusType.finished)                      //|| service.checkAsyncStatus(jobId).status != AsyncStatusType.failed                      //|| service.checkAsyncStatus(jobId).status != AsyncStatusType.finishedWithErrors)                  {                      Thread.Sleep(1000 * 60 * 5);                                     }                    asr = (AsyncSearchResult)service.getAsyncResult(jobId, asr.searchResult.pageIndex + 1);                } // while